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Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Inventor:
Kerth; Donald A.
Address:
Austin, TX
No. of patents:
61
Patents:


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Patent Number Title Of Patent Date Issued
8224259 Digital architecture for radio-frequency apparatus and associated methods July 17, 2012
A radio-frequency (RF) receiver includes a receiver analog circuitry and a receiver digital circuitry. The receiver analog circuitry resides within a first integrated circuit and the receiver digital circuitry resides within a second integrated circuit. The second integrated circuit
8154336 Method and apparatus for reducing interference April 10, 2012
A method and apparatus is provided for reducing interference in circuits. A management strategy is provided to reduce reference spurs and interference in circuits. The management strategy uses a combination of one or more techniques which reduce the digital current, minimize mutual i
8150358 Method for performing dual mode image rejection calibration in a receiver April 3, 2012
A method is disclosed for performing dual mode image rejection calibration in a receiver. A first image correction factor is acquired using a first known signal associated with a first signal band during a startup mode. The first image correction factor has a plurality of bits includ
7979048 Quasi non-volatile memory for use in a receiver July 12, 2011
Image rejection factors are calibrated for a receiver circuit (106) during an initialization period. The image rejection factors are stored in a quasi non-volatile memory (124) associated with the receiver circuit (106). The quasi non-volatile memory (124) is powered from a first source
7941102 Partitioned radio-frequency apparatus and associated methods May 10, 2011
Radio-frequency (RF) apparatus includes receiver analog circuitry that receives an RF signal and provides at least one digital signal to receiver digital circuitry that functions in cooperation with the receiver analog circuitry. The receiver analog circuitry and the receiver digital
7884666 Method and apparatus for reducing interference February 8, 2011
A method and apparatus is provided for reducing interference in circuits. A management strategy is provided to reduce reference spurs and interference in circuits. The management strategy uses a combination of one or more techniques which reduce the digital current, minimize mutual i
7783274 Chopped intermediate frequency wireless receiver August 24, 2010
A chopped intermediate frequency (IF) wireless receiver is disclosed. The wireless receiver includes a local oscillator (LO), a first and a second mixers, an LO frequency control module, an IF filter, a digital down converter and a down conversion controller. The LO provides a local
7702362 Digital architecture for radio-frequency apparatus and associated methods April 20, 2010
A radio-frequency (RF) receiver includes a receiver analog circuitry and a receiver digital circuitry. The receiver analog circuitry resides within a first integrated circuit and the receiver digital circuitry resides within a second integrated circuit. The second integrated circuit coup
7689190 Controlling the frequency of an oscillator March 30, 2010
A technique includes generating an analog voltage to control a frequency for an oscillator. The analog signal is converted into a digital signal, and the frequency is controlled in response to the digital signal.
7676210 Method for performing dual mode image rejection calibration in a receiver March 9, 2010
A method is disclosed for performing dual mode image rejection calibration in a receiver. A first image correction factor is acquired for use in a receiver system using a first known signal associated with a first signal band during a startup mode. The first image correction factor is ad
7653356 System and method for reducing spurious emissions in a wireless communication device including a January 26, 2010
A wireless communication device is disclosed wherein isolation buffers couple to respective active circuits or stages of the device to convey test information regarding such active circuits to a test data line from which status information may be collected. The communication device o
7650119 Wireless communication system and method using digital calibration to control mixer input swing January 19, 2010
A wireless communication device is disclosed wherein the voltage swing of a local oscillator (LO) signal is controlled to prevent overstressing semiconductor devices in a mixer to which the LO signal is supplied. A quadrature divider supplies the LO signal to the mixer. Digital calib
7609781 Wireless communication device with self calibration feature for controlling power output October 27, 2009
A wireless communication device is disclosed which employs a minimal number of power calibrations to set the output power of the device to a specified output power level. In one embodiment, the disclosed communication device includes a self calibrating feature that sets the output po
7583946 Wireless communication system and method using clock swapping during image rejection calibration September 1, 2009
A wireless communication receiver is disclosed that operates in a test mode to determine image correction information that is used to suppress undesired image signals when the receiver switches to a normal operational mode. In one embodiment, the receiver includes a frequency synthes
7366478 Partitioned radio-frequency apparatus and associated methods April 29, 2008
Radio-frequency (RF) apparatus includes receiver analog circuitry that receives an RF signal and provides at least one digital signal to receiver digital circuitry that functions in cooperation with the receiver analog circuitry. The receiver analog circuitry and the receiver digital
7333831 Interchangeable receive inputs for band and system swappability in communication systems and rel February 19, 2008
Interchangeable high band low-noise-amplifiers (LNAs) and low band low-noise-amplifiers (LNAs) and related methods are disclosed that greatly enhance the efficiency of designing handsets for different combinations of frequency bands. The input signals to particular pins on a receiver
7292091 Method and apparatus for reducing interference November 6, 2007
A method and apparatus is provided for reducing interference in circuits. A management strategy is provided to reduce reference spurs and interference in circuits. The management strategy uses a combination of one or more techniques which reduce the digital current, minimize mutual i
7285940 Voltage regulator with shunt feedback October 23, 2007
A voltage regulator configured to receive a supply voltage from a voltage supply and provide a regulated voltage to digital circuitry is provided. The voltage regulator comprises first circuitry configured to inhibit high frequency energy generated by the digital circuitry from trans
7280001 Capacitor array segmentation October 9, 2007
In one embodiment, the present invention includes a capacitor array that may provide a selected capacitance to a digitally controlled crystal oscillator (DCXO). The array may include multiple sections each having at least one array portion, where each section is to receive different
7272374 Dynamic selection of local oscillator signal injection for image rejection in integrated receive September 18, 2007
A system and method are disclosed for dynamically selecting high-side injection or low-side injection of local oscillator mixing signals based upon an assessment of signal power within the input signal spectrum that could cause unwanted images in the processed signal. This image rejectio
7242912 Partitioning of radio-frequency apparatus July 10, 2007
Components of a radio-frequency (RF) apparatus including transceiver circuitry and frequency modification circuitry of a crystal oscillator circuit that generates a reference signal with adjustable frequency may be partitioned in a variety of ways, for example, as one or more separate
7228109 DC offset reduction in radio-frequency apparatus and associated methods June 5, 2007
A radio-frequency receiver circuitry includes a down-converter circuitry, an analog-to-digital converter circuitry, and a DC offset reduction circuitry. The down-converter circuitry accepts a received radio-frequency signal and processes the radio-frequency signal to provide an in-ph
7221921 Partitioning of radio-frequency apparatus May 22, 2007
Components of a radio-frequency (RF) apparatus including transceiver circuitry and frequency modification circuitry of a crystal oscillator circuit that generates a reference signal with adjustable frequency may be partitioned in a variety of ways, for example, as one or more separate
7206560 Chopped intermediate frequency wireless receiver April 17, 2007
A chopped intermediate frequency (IF) wireless receiver is disclosed. The wireless receiver includes a local oscillator (LO), a first and a second mixers, an LO frequency control module, an IF filter, a digital down converter and a down conversion controller. The LO provides a local
7199650 Method and apparatus for reducing interference April 3, 2007
A method and apparatus is provided for reducing interference in circuits. A management strategy is provided to reduce reference spurs and interference in circuits. The management strategy uses a combination of one or more techniques which reduce the digital current, minimize mutual i
7177617 Method and apparatus for enhancing signal quality within a wireless receiver February 13, 2007
A method and apparatus for enhancing signal quality within a wireless receiver are disclosed. An image of a desired signal is down-converted to a baseband signal by a digital down converter. The energy of the baseband signal is subsequently determined. If the energy of the baseband signa
7177610 Calibrated low-noise current and voltage references and associated methods February 13, 2007
A low-noise current reference circuitry includes a voltage source, a current source, and a controller. The voltage source generates a reference voltage. The current source provides a low-noise output current in response to a control signal. The controller provides the control signal
7138858 Apparatus and methods for output buffer circuitry with constant output power in radio-frequency November 21, 2006
A buffer circuitry buffers a radio-frequency (RF) signal. The buffer circuitry includes a complementary pair of switches and a power source. The a complementary pair of switches has an input terminal and output terminal. The input terminal of the complementary pair of switches respon
7092675 Apparatus and methods for generating radio frequencies in communication circuitry using multiple August 15, 2006
A radio-frequency (RF) apparatus capable of transmitting RF signals includes transmitter path circuitry. The transmitter path circuitry includes a voltage-controlled oscillator (VCO) that generates an output signal. The frequency of the output signal of the VCO circuitry is adjustabl
7035611 Apparatus and method for front-end circuitry in radio-frequency apparatus April 25, 2006
A radio-frequency (RF) apparatus includes front-end circuitry. The front-end circuitry includes a filter circuitry and an impedance matching circuitry. The filter circuitry has a differential output that has an output impedance. The filter circuitry filters signals outside a signal b
7031683 Apparatus and methods for calibrating signal-processing circuitry April 18, 2006
A calibration circuitry includes an adjustable capacitor, a voltage generator, a reference voltage generator, and a controller. The reference voltage generator provides a reference voltage. The voltage generator provides a measurement voltage that depends on the capacitance of the ad
7024221 Notch filter for DC offset reduction in radio-frequency apparatus and associated methods April 4, 2006
A radio-frequency (RF) receiver includes a receiver analog circuitry and a receiver digital circuitry coupled together. The receiver analog circuitry receives an RF signal. The receiver analog circuitry processes the received RF signal and generates a digital signal that it provides to
6993314 Apparatus for generating multiple radio frequencies in communication circuitry and associated me January 31, 2006
A radio-frequency (RF) apparatus capable of transmitting RF signals includes transmitter path circuitry. The transmitter path circuitry includes a voltage-controlled oscillator (VCO) circuitry. The VCO circuitry generates a first signal that has a first frequency. A divider circuitry
6970717 Digital architecture for radio-frequency apparatus and associated methods November 29, 2005
A radio-frequency (RF) receiver includes a receiver analog circuitry and a receiver digital circuitry. The receiver analog circuitry resides within a first integrated circuit and the receiver digital circuitry resides within a second integrated circuit. The second integrated circuit coup
6946898 System and method for biasing electrical circuits September 20, 2005
A bias system is disclosed including a calibration bus to which a controller, a reference bias source, a master bias source, and first and second slave bias sources are coupled. The controller varies a control code sent over the calibration bus to the master bias source until a parti
6804497 Partitioned radio-frequency apparatus and associated methods October 12, 2004
Radio-frequency (RF) apparatus includes receiver analog circuitry that receives an RF signal and provides at least one digital signal to receiver digital circuitry that functions in cooperation with the receiver analog circuitry. The receiver analog circuitry and the receiver digital
6650264 Quadrature sampling architecture and method for analog-to-digital converters November 18, 2003
Quadrature sampling architecture and method are disclosed for analog-to-digital converters that provide improved digital output signals over prior quadrature mixing implementations. Sampling circuitry according to the present invention samples an input signal with a first and second
6311050 Single integrated circuit phase locked loop for synthesizing high-frequency signals for wireless October 30, 2001
A method and apparatus for synthesizing high-frequency signals is disclosed that overcomes integration problem associated with prior implementations while meeting demanding phase noise and other impurity requirements. In one embodiment, a phase-locked loop (PLL) frequency synthesizer is
6226506 Method and apparatus for eliminating floating voltage nodes within a discreetly variable capacit May 1, 2001
A method and apparatus for synthesizing high-frequency signals is disclosed that overcomes integration problem associated with prior implementations while meeting demanding phase noise and other impurity requirements. In one embodiment, a phase-locked loop (PLL) frequency synthesizer is
6148048 Receive path implementation for an intermediate frequency transceiver November 14, 2000
A receive path implementation for an intermediate frequency (IF) transceiver is disclosed that provides increased signal processing integrity and accuracy with an efficient and improved design. A complex filter for a bandpass delta-sigma analog-to-digital converter (ADC) provides eff
5729229 Data independent loading of a reference in a sampled data integrator March 17, 1998
A 1-bit discrete time digital-to-analog converter which samples a reference voltage and ground potential onto two charging capacitors during a sample phase of each sampling period, and which transfers the charge on one of the capacitors, as determined by a digital input signal, onto an
5717321 Drive current calibration for an analog resistive touch screen February 10, 1998
An analog resistive touch screen is powered by a current source responsive to a stored digital control value. The current source is calibrated by comparing the excitation voltage across the touch screen to a desired voltage to produce a comparison signal, and adjusting the digital contro
5644308 Algorithmic analog-to-digital converter having redundancy and digital calibration July 1, 1997
An algorithmic converter system includes an algorithmic converter having a loop gain substantially less than two for converting an analog input signal to a redundant digital code; and a digital computation unit for converting the redundant digital code to a digital output signal by c
5644257 Sampling circuit charge management July 1, 1997
The detrimental nonlinear charging currents from an analog input signal through an anti-aliasing filter into a sampling circuit can be minimized by using primary and secondary inputs to the sampling circuit. The secondary input is turned on before the primary input and the charge req
5621339 Method and apparatus for removing trapped oxide charge from a differential input stage April 15, 1997
A differential input stage for a data conversion device includes two sections, one section for operating during a high stress portion of a charge transfer operation and one portion for operating during the remainder of the charge transfer operation. The first portion is comprised of
5583501 Digital-to-analog converter with digital linearity correction December 10, 1996
Digital linearity correction is obtained by generating a digital calibration signal having at least one frequency component, converting the digital calibration signal to an analog signal, and detecting distortion in the analog signal generated from the calibration signal by nonlinearity
5579247 Method and apparatus for decreasing the interference and noise sensitivity of a ratiometric conv November 26, 1996
A ratiometric converter receives an external sense signal and external reference signal and provides an output signal which is proportional to the sense signal and inversely proportional to the reference signal. Electromagnetic interference and noise coupled onto the sense and refere
5541599 Data independent loading of a reference in a discrete time system July 30, 1996
A 1-bit discrete time digital-to-analog converter which samples a reference voltage and ground potential onto two charging capacitors during a sample phase of each sampling period, and which transfers the charge on one of the capacitors, as determined by a digital input signal, onto an
5477481 Switched-capacitor integrator with chopper stabilization performed at the sampling rate December 19, 1995
A switched-capacitor integrator with chopper stabilization performed at the sampling rate virtually eliminates the flicker noise and any low frequency interference generated by the amplifier. The integrator samples the input and then passes the sampled input to the feedback capacitor dur
5412348 Compound triple cascoded mirror May 2, 1995
A triple cascoded mirror active load includes three transistors (20), (26) and (28) in a first leg and three transistors (22), (30) and (34) in an output leg connected to an output node (18). The first leg receives a current on an input node (14) on the drain of transistor (20). Transist
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