| Patent Number |
Title Of Patent |
Date Issued |
| 7459988 |
High linearity wide dynamic range radio frequency antenna switch |
December 2, 2008 |
| The present invention is a wide dynamic range antenna switch that, when disabled, has a stable input impedance over a wide power range. The wide dynamic range antenna switch includes multiple transistors, which are coupled in series, to provide a main signal path between an antenna c |
| 7459356 |
High voltage GaN-based transistor structure |
December 2, 2008 |
| The present invention relates to a high voltage and high power gallium nitride (GaN) transistor structure. In general, the GaN transistor structure includes a sub-buffer layer that serves to prevent injection of electrons into a substrate during high voltage operation, thereby improv |
| 7457586 |
Method of in-device phase measurement and correlation to programmable factors |
November 25, 2008 |
| A method is provided for calibrating Amplitude Modulation to Phase Modulation (AM/PM) predistortion coefficients for a polynomial used to compensate for AM/PM distortion of a power amplifier in the transmit chain of a mobile terminal. In general, the power amplifier is controlled by |
| 7454179 |
Radio frequency power detector and decision circuit used with DC supply voltage controlled power |
November 18, 2008 |
| The present invention is an active RF power detector and decision circuit, which is used to provide a DC signal to circuitry that controls the DC supply voltage to an RF power amplifier. The DC signal is proportional to the amount of RF power detected within specified operating limits. W |
| 7451539 |
Method of making a conformal electromagnetic interference shield |
November 18, 2008 |
| An electromagnetic shield for an electronic module includes a surface finish that is applied to the surface of an electronic module so as to minimize the size of the shield. Once the shield is in place, the shield acts to address electromagnetic interference (EMI) concerns associated |
| 7450919 |
I/Q mismatch correction using transmitter leakage and gain modulation |
November 11, 2008 |
| A system and method are provided for compensating for an I/Q mismatch of a receiver in a mobile terminal. In general, the receiver and a transmitter of the mobile terminal are formed on a single substrate. A transmit signal is transmitted via the transmitter. Due to leakage through the |
| 7450916 |
Excess current and saturation detection and correction in a power amplifier |
November 11, 2008 |
| A system and method for detecting and correcting excess current in a power amplifier in a transmit chain of a mobile terminal are provided. Over current detection and correction circuitry compares a current detection signal indicative of an output current of the power amplifier to a |
| 7449960 |
Frequency modulation linearization system for a Fractional-N offset PLL |
November 11, 2008 |
| A linearization system is provided for a Fractional-N Offset Phase Locked Loop (FN-OPLL) in a frequency or phase modulation system. In general, the linearization system processes a modulation signal to provide a linearized modulation signal to a fractional-N divider in a reference pa |
| 7449813 |
Interleaved interdigitated transducers |
November 11, 2008 |
| The present invention provides an interleaved IDT that is connected to and overlaps adjacent IDTs. In particular, the interleaved IDT may be connected to both an input IDT and an output IDT via corresponding bus bars. The first bus bar of the interleaved IDT is connected to the bus b |
| 7440734 |
Active quadrature radio frequency power detector |
October 21, 2008 |
| The present invention is a quadrature RF power detector circuit, which is used in conjunction with a quadrature RF power amplifier to detect and combine RF signals from an in-phase amplifier leg and from a quadrature-phase amplifier leg to provide an RF power detection signal. The qu |
| 7439805 |
Enhancement-depletion Darlington device |
October 21, 2008 |
| An apparatus comprising a Darlington transistor pair comprising a first transistor and a second transistor. The first transistor may have a gate configured to receive an input signal. The second transistor may have a gate coupled to a source of the first transistor. The Darlington tr |
| 7412215 |
System and method for transitioning from one PLL feedback source to another |
August 12, 2008 |
| A system and method are provided for switching from one phase-locked loop feedback source to another in a radio frequency (RF) transmitter. The RF transmitter includes a phase-locked loop (PLL) that provides a phase-modulated RF input signal and power amplifier circuitry that amplifi |
| 7408286 |
Piezoelectric substrate for a saw device |
August 5, 2008 |
| The present invention provides a composite structure having a supporting substrate between a piezoelectric substrate and a compensation layer. The materials used to form the piezoelectric substrate and the compensation layer in isolation, have higher thermal coefficients of expansion (TC |
| 7408284 |
Center chirping within series connected interdigitated transducers |
August 5, 2008 |
| A SAW architecture is provided with two acoustic reflectors formed on a piezoelectric substrate defining an acoustic cavity between the acoustic reflectors. At least one alpha IDT may be provided, and at least three beta IDTs are provided. These IDTs are placed in acoustic series within |
| 7408182 |
Surface passivation of GaN devices in epitaxial growth chamber |
August 5, 2008 |
| The present invention relates to passivation of a gallium nitride (GaN) structure before the GaN structure is removed from an epitaxial growth chamber. The GaN structure includes one or more structural epitaxial layers deposited on a substrate, and the passivation layer deposited on |
| 7388433 |
Ground inductance compensated quadrature radio frequency amplifier |
June 17, 2008 |
| The present invention is a quadrature RF amplifier including an in-phase amplifier leg and a quadrature-phase amplifier leg. The nominal gain of the in-phase amplifier leg is substantially different from the nominal gain of the quadrature-phase amplifier leg to compensate for gain im |
| 7382030 |
Integrated metal shield for a field effect transistor |
June 3, 2008 |
| The present invention relates to a semiconductor device having an integrated metal shield. The shield, created as part of a MOSFET, is formed about a gate electrode of the MOSFET to effectively reduce drain-to-gate capacitance and increase breakdown voltage. The shield consists of a |
| 7372326 |
Radio frequency parallel amplifier |
May 13, 2008 |
| The present invention is a parallel RF amplifier circuit that selects between a high power side (HPS) and a low power side (LPS), depending upon output power. A chain matching network couples an LPS output to an HPS output for improved efficiency at lower output power. When the HPS is |
| 7359453 |
System and method for transitioning between modulation formats in adjacent bursts triggering on |
April 15, 2008 |
| A modulation system and method are provided for transitioning between modulation formats in adjacent transmit bursts. The modulation system includes a data interface, first modulation circuitry operating according to a first modulation format, and second modulation circuitry operating |
| 7356074 |
Estimation of multipath channel with sub-chip resolution |
April 8, 2008 |
| The present invention provides a method and apparatus for estimating a multipath channel with sub-chip resolution. In general, secondary signals are characterized based on correlating a received signal including multipath signals, which include a main and the secondary signals, with a |
| 7340235 |
System for limiting current in an output stage of a power amplifier |
March 4, 2008 |
| A system and method for limiting current in an output stage of power amplifier circuitry in a transmitter of a mobile terminal are provided. In general, the current in the output stage of the power amplifier circuitry is detected during each transmit burst from the power amplifier ci |
| 7336134 |
Digitally controlled oscillator |
February 26, 2008 |
| A tunable oscillator suitable for use in a frequency synthesizer of a transceiver is controlled by varying one or more parameters associated with the oscillator. In particular, a digital control signal affects one or more of the capacitances of the oscillator, the bias voltage of the |
| 7336127 |
Doherty amplifier configuration for a collector controlled power amplifier |
February 26, 2008 |
| An efficient power amplifier circuitry for a mobile terminal or similar wireless communication device is provided. The power amplifier circuitry includes an output stage configured as a collector controlled Doherty amplifier, wherein the collector controlled Doherty amplifier increases |
| 7336056 |
Switching power converter that supports both a boost mode of operation and a buck mode of operat |
February 26, 2008 |
| The present invention is a switching power converter that supports both a boost mode of operation and a buck mode of operation, uses one energy storage element, transitions smoothly between boosting and bucking, and avoids simultaneous boosting and bucking. The switching power converter |
| 7333781 |
Power correction loop for a power amplifier |
February 19, 2008 |
| A system is provided for correcting an output power of a power amplifier in a transmit chain of a mobile terminal. In one embodiment, the system includes output power correction circuitry that corrects the output power of the power amplifier during ramp-up for a transmit burst. The outpu |
| 7330071 |
High efficiency radio frequency power amplifier having an extended dynamic range |
February 12, 2008 |
| A system and method are provided for efficiently amplifying a radio frequency signal. In general, the system includes power amplifier circuitry that efficiently amplifies an input signal under power back-off conditions. In one embodiment, the power amplifier circuitry has an efficien |
| 7315211 |
Sliding bias controller for use with radio frequency power amplifiers |
January 1, 2008 |
| A two stage power amplifier circuit that employs both a DC to DC converter and sliding bias controller to improve power amplifier efficiency. The control signal that is generated by the power detector circuit to control the input voltage to the DC to DC converter is also used to provide |
| 7315152 |
System for detecting current in an output stage of a power amplifier |
January 1, 2008 |
| A system for detecting current in an output stage of power amplifier circuitry in a transmitter of a mobile terminal is provided. In general, the mobile terminal includes power amplifier circuitry, power control circuitry, current detection circuitry, and an inductor that essentially |
| 7313376 |
DC offset correction for a wireless communication system |
December 25, 2007 |
| A system and method for performing DC offset correction in a wireless communication receiver during "dead time" are provided. The receiver includes amplifier circuitry that amplifies a received radio frequency (RF) signal, downconversion circuitry that downconverts the received RF si |
| 7302011 |
Quadrature frequency doubling system |
November 27, 2007 |
| The frequency doubler of the present invention operates to provide an in-phase signal and a quadrature signal, each having a frequency equal to twice the frequency of a reference signal. The in-phase and quadrature signals are based on signals that are 0 degrees, 45 degrees, 90 degrees, |
| 7301400 |
Multi-phase switching power supply for mobile telephone applications |
November 27, 2007 |
| A mobile terminal including a multi-phase DC-DC converter for controlling a supply voltage provided to a power amplifier in the transmit chain. In general, the multi-phase DC-DC converter includes a multi-phase converter control system and a multi-phase power train. The multi-phase conve |
| 7301398 |
High linearity differential transconductance amplifier |
November 27, 2007 |
| The present invention is a differential transconductance amplifier circuit that includes matched cross-coupled transconductance elements connected such that the differential gain of the amplifier is determined by only passive elements. By virtually eliminating the effects of active eleme |
| 7289775 |
Method for transmit power control |
October 30, 2007 |
| A transceiver has power control circuitry integrated therein. In particular, the power control circuitry receives a signal indicative of the transmit power level and adjusts the gain on a variable gain amplifier within the transceiver such that the output of the transceiver is at a l |
| 7288999 |
Pre-distortion system for a synthesizer having modulation applied in the reference path |
October 30, 2007 |
| A system providing a phase or frequency modulated signal is provided. In general, the system includes a phase locked loop (PLL) having a fractional-N divider in a reference path of the PLL operating to divide a reference frequency based on a pre-distorted modulation signal. Pre-disto |
| 7279988 |
Digital frequency locked loop and phase locked loop frequency synthesizer |
October 9, 2007 |
| A frequency synthesizer including frequency and phase locked loop that operates in either a frequency locked loop (FLL) mode or a phase locked loop (PLL) mode. In a first state, the frequency and phase locked loop operates in the FLL mode for initial frequency acquisition. Once the f |
| 7277497 |
System and method for transitioning between modulation formats in adjacent bursts triggering on |
October 2, 2007 |
| A system and method are provided for transitioning between modulation formats in adjacent transmit bursts. The system includes a modulation system having a data interface, first modulation circuitry operating according to a first modulation format, and second modulation circuitry ope |
| 7274748 |
AM to FM correction system for a polar modulator |
September 25, 2007 |
| A transmitter for a mobile terminal including a polar modulator that compensates for amplitude to frequency distortion (AM to FM distortion) of a power amplifier in the transmit chain is provided. In general, the modulator includes a polar converter that converts an input signal into |
| 7274229 |
Coarse tuning for fractional-N synthesizers |
September 25, 2007 |
| An improved coarse tuning process for fractional-N frequency synthesizers is provided. In general, a coarse tuning circuit controls a phase lock loop (PLL) of a frequency synthesizer such that the phase lock loop operates in an integer division mode during coarse tuning, thereby elim |
| 7256650 |
VSWR tolerant power detector |
August 14, 2007 |
| A system is provided for detecting the output power of power amplifier circuitry in a transmitter of a mobile terminal. Balanced power amplifier circuitry is provided having in-phase power amplifier circuitry and quadrature phase amplifier circuitry. A power detection system provides a |
| 7251298 |
Receiver architecture eliminating static and dynamic DC offset errors |
July 31, 2007 |
| The present invention provides a receiver frontend that eliminates static and dynamic DC errors and has improved second order intermodulation distortion (IMD2) performance. The receiver frontend includes a first mixer that multiplies a received signal and a first local oscillator (LO) |
| 7233130 |
Active ripple reduction switched mode power supplies |
June 19, 2007 |
| A system and method are provided for actively reducing ripple in a supply voltage provided by a switched mode power supply. In general, active ripple reduction circuitry operates to sense the ripple in the supply voltage to provide a signal indicative of the ripple. The signal indica |
| 7197089 |
Frequency plan for GPS receiver |
March 27, 2007 |
| The present invention provides a GPS receiver having a unique frequency plan, thereby eliminating interference due to internally generated frequencies. In general, the GPS receiver has downconversion circuitry that uses a first synthesizer output signal with a center frequency of 272 |
| 7193459 |
Power amplifier control technique for enhanced efficiency |
March 20, 2007 |
| A power amplifier configuration including power amplifier circuitry and power control circuitry and having improved Power Added Efficiency (PAE) is provided. The power amplifier circuitry includes one or more input amplifier stages in series with a final amplifier stage. The power co |
| 7190935 |
Amplifier power detection circuitry |
March 13, 2007 |
| The present invention provides an efficient way to detect the transmit power provided by an amplifier. A power sense signal indicative of the transmit power of the amplifier is generated and fed back to a control system, which will react accordingly to control input signal levels, bi |
| 7181205 |
I/Q calibration |
February 20, 2007 |
| The amplitude and phase errors of the modulation and demodulation in a transceiver are corrected by a self-calibration procedure in which a test signal is applied to the baseband input of the transmitter, and the output of the modulator is looped back to the input of the demodulator. |
| 7171171 |
GaAs RF signal detection circuit with operational amplifier |
January 30, 2007 |
| A mobile terminal senses transmitted power in a Gallium Arsenide (GaAs) circuit. The GaAs circuit provides a steady reference voltage through the use of an operational amplifier and feedback circuit. The operational amplifier drives the bases of two transistors to create balanced signals |
| 7167530 |
Estimation and correction of DC offset in the presence of frequency offset |
January 23, 2007 |
| Systems and methods for estimating and correcting a DC offset in a receiver in the presence of a carrier frequency offset. Samples corresponding to a transmitted signal are received. Each sample is corrected for a carrier frequency offset. An average value is computed for a training |
| 7167054 |
Reconfigurable power control for a mobile terminal |
January 23, 2007 |
| Power control circuitry that is configurable as either a Low Dropout (LDO) voltage regulator or a switching DC--DC converter for controlling a variable supply voltage provided to a power amplifier of a mobile terminal is provided. The power control circuitry includes an output stage |
| 7151363 |
High PSRR, fast settle time voltage regulator |
December 19, 2006 |
| A voltage regulator including a high-speed feedback loop operating to provide rapid settling time and a large Power Supply Rejection Ratio (PSRR). The high-speed feedback loop includes a reservoir capacitor that stores charge based on a charging current. The charge stored by the rese |
| 7135766 |
Integrated power devices and signal isolation structure |
November 14, 2006 |
| A flip chip power device having an integrated low inductance ground and heat sink path and an isolation structure is provided. A substrate is formed having transistors and an ohmic contact region circumscribing the transistors. Dielectric layers are formed on the substrate, and a common |
