| Patent Number |
Title Of Patent |
Date Issued |
| 7509106 |
Test signal generation circuit, and reception circuit |
March 24, 2009 |
| A test signal generation circuit includes a tuning circuit, a local oscillation circuit for forming orthogonal local oscillation signals, first mixer circuits for frequency-converting the reception signal into IF signals by the local oscillation signals, IF-filters for extracting the |
| 7505746 |
IC receiver to minimize tracking error |
March 17, 2009 |
| A multi-band receiver in which characteristics including a tracking error are improved is provided with a variable frequency oscillator circuit, a variable divider circuit (39) for dividing an oscillation signal (SVCO) of the variable frequency oscillator circuit, and mixer circuits (15I |
| 7433476 |
Automatic gain control |
October 7, 2008 |
| In an automatic gain control unit, the gain of a voltage-controlled amplifier (VCA) (25) is regulated with a closed-loop control circuit. The time constant of the control circuit is varied dependent on the magnitude (31) of the VCA output signal. As long as the magnitude (31) of the VCA |
| 7382836 |
Receiving device and integrated circuit for reception |
June 3, 2008 |
| In order to improve various characteristics of a receiving circuit for digital radio services, circuits are provided for forming two local oscillation signals, whose frequencies are both the center frequency between a first ensemble and a second ensemble, and whose phases differ by 9 |
| 7373124 |
Receiver |
May 13, 2008 |
| A receiver includes a tuning circuit for picking up a reception signal having a desired frequency, a local oscillator for forming an oscillation signal, a first mixer for frequency-converting the reception signal into an IF signal by using the oscillation signal, an IF filter for derivin |
| 7362825 |
Receiving device and integrated circuit for reception |
April 22, 2008 |
| In order to improve various characteristics of a receiving circuit for digital radio services, circuits are provided for forming two local oscillation signals, whose frequencies are both the center frequency between a first ensemble and a second ensemble, and whose phases differ by 9 |
| 7330707 |
Hetrodyne receiver and IC |
February 12, 2008 |
| In a heterodyne receiver, the effect of an image interference signal that occurs in a case where a low intermediate frequency is used is alleviated. Circuits (12I), (12Q), (13I), (13Q), and (14) are provided to switch a heterodyne system between an upper heterodyne system and a lower |
| 7212796 |
Antenna unit and receiving circuit |
May 1, 2007 |
| An antenna unit includes an antenna, a high-frequency amplifier, an attenuator circuit, an output cable, and a voltage detector circuit. An operating voltage is supplied from a receiver to the high-frequency amplifier through the output cable. The operating voltage changes in accorda |
| 7164895 |
Antenna tuned circuit for a superheterodyne receiver |
January 16, 2007 |
| A multi-band receiver in which characteristics including a tracking error are improved is provided with a variable frequency oscillator circuit, a variable divider circuit (39) for dividing an oscillation signal (SVCO) of the variable frequency oscillator circuit, and mixer circuits (15I |
| 7079602 |
Receiving apparatus and method and provision medium |
July 18, 2006 |
| An interference signal from an adjacent signal is prevented and a desired signal demodulated.A frequency conversion circuit 4 converts a received signal frequency to a first intermediate frequency signal of a first intermediate frequency higher than the frequency of the signal to be |
| 6999525 |
Receiving device and integrated circuit for reception |
February 14, 2006 |
| In order to improve various characteristics of a receiving circuit for digital radio services, circuits are provided for forming two local oscillation signals, whose frequencies are both the center frequency between a first ensemble and a second ensemble, and whose phases differ by 9 |
| 6904103 |
Receiving device and integrated circuit for reception |
June 7, 2005 |
| In order to improve various characteristics of a receiving circuit for digital radio services, circuits are provided for forming two local oscillation signals, whose frequencies are both the center frequency between a first ensemble and a second ensemble, and whose phases differ by 9 |
| 6813310 |
Receiver and IC thereof capable of receiving analog broadcast and digital broadcast |
November 2, 2004 |
| A receiver is equipped with a demodulation circuit for taking a signal indicating broadcast contents of an analog broadcast out of the first and second intermediate-frequency signals, and for taking a signal indicating broadcast contents of a digital broadcast out of the first and second |
| 6788747 |
Receiver capable of receiving analog broadcast and digital broadcast and IC for the same |
September 7, 2004 |
| A receiver equipped with first and second mixer circuits for performing frequency conversion of a received signal into two intermediate-frequency signals, phases of which are orthogonal to each other, by means of two local oscillation signals, and a plurality of filter circuits for takin |
| 6714600 |
Receiver |
March 30, 2004 |
| A reception circuit 10 for receiving an analog broadcast and outputting an audio signal based on the analog broadcast includes a digital demodulation circuit 28 for digitally demodulating an intermediate frequency signal obtained in the reception circuit 10 at the reception time of the d |
| 6529100 |
Polyphase filter and receiver using the same |
March 4, 2003 |
| A polyphase filter having metal-insulator-semiconductor (MIS) capacitors in which the whole body of the polyphase filter is fabricated as an IC. Resistors are individually combined with the capacitors to form serial connection circuits and every four signal connection circuits individual |
| 6466776 |
Receiver and method of reception |
October 15, 2002 |
| A receiver and a receiving method, both for use in a broadcasting system in which analog broadcast signals and digital broadcast signals are transmitted in adjacent frequency bands. The receiver has an analog processing circuit for receiving and processing analog broadcast-wave signa |
| 6392454 |
Shunt regulated push-pull circuit having wide frequency range |
May 21, 2002 |
| In an SRPP circuit, a transistor Q11 has a collector connected to a power supply terminal T13 through a resistor R11 and an emitter connected to the collector of a transistor Q12 having the same polarity as that of transistor Q11. The emitter of the transistor Q12 is connected to the |
| 5942935 |
Filter circuit |
August 24, 1999 |
| A filter device suitable for being integrated into a single IC chip comprises a reference signal generator, a first filter circuit, a second filter circuit, a phase-comparator circuit, and a low-pass filter. The reference signal generator is for generating a reference signal. The first |
| 5758270 |
Level control circuit for receiver |
May 26, 1998 |
| An emitter of a transistor Q22 and a collector of a transistor Q23 are connected in series. The transistors Q22 and Q23 are of the same polarity. The transistor Q23 is connected to function as a diode for an alternating current. To the junction point between the emitter of the transistor |
| 5758265 |
Transmitting and receiving apparatus for incorporation into an integrated circuit |
May 26, 1998 |
| A transmitting and receiving apparatus configured in superheterodyne form, includes a receiving circuit for receiving a signal on one channel of a predetermined pair of channels and a transmitting circuit for transmitting a signal on the other channel of the predetermined pair of channel |
| 5757921 |
Radio communication apparatus having common oscillator applied for PLL, conversion and scramble/ |
May 26, 1998 |
| A superheterodyne receiving circuit and a superheterodyne transmitting circuit are provided. A PLL forms a local oscillation signal in the receiving circuit, and a PLL forms a carrier signal in the signal transmitting circuit. A circuit converts digital data into signals suitable for |
| 5710997 |
Superheterodyne receiver apparatus |
January 20, 1998 |
| A receiver apparatus comprises a first local oscillator, a first pair of mixer circuits, a second local oscillator, a second pair of mixer circuits, an adding circuit, a bandpass filter and a modulation circuit. When the frequency of a second local oscillating circuit varies, a center |
| 5584066 |
Correcting circuit for mixing circuit receiver using same and frequency spectrum inverting circu |
December 10, 1996 |
| A double superheterodyne receiver comprising a pair of first mixer circuits, a pair of second mixer circuits, a demodulator circuit, and a pair of detector circuits. The first mixer circuits are connected in an orthogonal relation to each other and acts to convert a received RF signal |
| 5566365 |
Active filter circuit and portable telephone apparatus |
October 15, 1996 |
| An active filter circuit used in a receiver circuit of a cellular telephone or the like has a voltage/current conversion circuit, an integrating circuit and a current dividing circuit. The voltage/current conversion circuit converts an input signal voltage to a signal current. The signal |
| 5428835 |
AM receiver on semi-conductor with internally generated oscillation signal representing if band |
June 27, 1995 |
| A superheterodyne receiver has a receiver circuit formed into a single semiconductor chip comprising a pseudo band-pass filter employing components equivalent to those of an intermediate-frequency filter of the receiver circuit and an oscillation circuit employing the pseudo band-pass |
| 5404587 |
AFC circuit and IC of the same adapted for lower heterodyne conversion and upper heterodyne conv |
April 4, 1995 |
| An automatic frequency control circuit comprises a variable reactance element connected to a resonance circuit of a local oscillation circuit of an FM receiver, an inverting amplifier to which a demodulation output of an FM demodulation circuit of the FM receiver is supplied, and series |
| 5349285 |
Power supply circuit |
September 20, 1994 |
| In a power supply circuit formed into an IC for use in a battery-powered apparatus, an operating current line of a first circuit and that of a second circuit are connected in series to a power source. An output line of a constant voltage regulator is connected to the middle junction of t |
| 5300826 |
Interface circuit for audio signal |
April 5, 1994 |
| An interface circuit for an audio signal includes a low-pass filter supplied with an audio signal with a DC component superposed thereon from a first circuit for extracting the DC component and a differential-input circuit. The differential-input circuit is supplied with the audio signal |
| 5285172 |
Current mirror power amplifier with gain controlled by resistor-capacitor network |
February 8, 1994 |
| An amplifier in which a current mirror circuit 53 is formed of a transistor Q25 on the input side and a transistor Q26 on the output side. The base-emitter junction area of the transistor Q26 is set to be N (N>1) times as large as that of the transistor Q25. A parallel circuit of a |
| 5020147 |
FM/AM broadcast signal converter |
May 28, 1991 |
| A received modulated information signal is converted to an intermediate frequency (IF) signal from which modulating information may be recovered by supplying the modulated information signal to two mixers supplied with local oscillating signals of equal frequency but phase shifted with |
| 4965528 |
Cross-coupled differential amplifier |
October 23, 1990 |
| An amplifier has first and second differential amplifier circuits connected in parallel for improving the distortion ratio characteristic and the like, with the first differential amplifier circuit including first and second transistors connected in common at respective emitters to a fir |
| 4933972 |
Stereo multiplex demodulator |
June 12, 1990 |
| A composite stereo signal comprised of a modulated signal modulated by a sum signal which is the sum of left and right channel audio signals and a difference signal which is the difference between the left and right channel audio signals, and a pilot signal synchronized with the modulate |
| 4739517 |
Autodyne receiver |
April 19, 1988 |
| An autodyne receiver comprises a plurality of tuning circuits for tuning a high frequency signal in linkage motion thereof and, in particular, a negative impedance converter connected to at least one of the tuning circuits to cancel apparent parallel resistance of the tuning circuit. |
| 4703292 |
Tuning circuit apparatus |
October 27, 1987 |
| In a tuning circuit apparatus comprising first and second tuning circuits having their tuning frequencies varied in a ganged fashion; a composite varactor device provides first and second Varicap diodes formed on a common semiconductor substrate, with anodes of the first and second V |
| 4659949 |
Phase-locked loop circuit |
April 21, 1987 |
| A phase comparing circuit can be made as a semiconductor integrated circuit for inclusion in a phase-locked loop for generating a phase-locked output signal synchronized with a pilot signal. The phase comparing circuit generates first and second reference signals with reverse polarity ab |
| 4639659 |
DC-DC converter |
January 27, 1987 |
| A DC-DC converter has an oscillation circuit, a voltage-multiplying rectifier circuit having a voltage source line as a reference potential point and being connected between an output of the oscillation circuit and an output terminal, a series circuit formed of a resistor and a diode |
| 4629914 |
Phase comparing circuit |
December 16, 1986 |
| A phase comparing circuit can be made as a semiconductor integrated circuit for inclusion in a phase-locked loop for generating a phase-locked output signal synchronized with a pilot signal. The phase comparing circuit generates first and second reference signals with reverse polarity ab |
| 4581593 |
Variable frequency oscillating circuit |
April 8, 1986 |
| A variable frequency oscillating circuit of the general Colpitts kind in which the frequency of oscillation varies in accordance with the current in a constant current source and oscillation stability is high because the oscillator is of the general LC form. Resonance is provided by a |
| 4578807 |
FM stereo multiplex demodulator |
March 25, 1986 |
| A composite FM stereo multiplex signal is demodulated using a double-balanced switching circuit cooperating with current mirror circuits so that demodulation and separation of the multiplexed signals occurs in the current domain. The switching circuit receives a switching signal that |
| 4567444 |
Current mirror circuit with control means for establishing an input-output current ratio |
January 28, 1986 |
| A current mirror circuit is formed of input and output transistors of the same polarity having emitters commonly connected to a reference potential and bases connected in common, the collector of the input transistor is connected to ground through a constant current source which initiall |
| 4560920 |
Voltage to current converting circuit |
December 24, 1985 |
| A voltage to current converting circuit can operate at low voltages and throughout a high range of voltages without distortion of the output signal current. An input-output current mirror circuit has a current input transistor and a current output transistor having their bases connected. |
| 4318050 |
AM Detecting circuit |
March 2, 1982 |
| A single-ended push-pull amplifier converts a single-ended input into a balanced signal which, after amplification, is fed to the bases of alternately operating transistors, and the resulting inverted, or out-of-phase output currents of the inverting transistors are fed back to almos |
| 4309656 |
Level indicating circuit |
January 5, 1982 |
| A level indicating circuit includes a pair of transistors, arranged as a differential amplifier and to whose bases an input signal is applied, a level-detecting circuit to supply to a meter or the like an indicating current whose level is related to the magnitude of the input signal; and |
