Class 455/248.1 - Constant or controlled input impedance

Subclass of Class 455 - Telecommunications
Definition: Subject matter wherein the automatic gain control means
No. of patents: 23
Last issue date: 03/27/2012

Number	Title	Issue Date
8145169	Method and system for LNA adjustment to compensate for dynamic impedance matching Aspects of a method and system for LNA adjustment to compensate for dynamic impedance matching are provided. In this regard, an antenna matching network may be configured to maximize received signal strength for a determined frequency and an amplifier gain may be ad...	03/27/2012
7949322	Frequency selective amplifier with wide-band impedance and noise matching This disclosure is directed to a frequency-selective low noise amplifier (LNA) with wide-band impedance and noise matching. The LNAS may include a closed loop circuit that supports wideband input matching. For example, the closed loop circuit may be configure to imp...	05/24/2011
7933574	Method and system for LNA adjustment to compensate for dynamic impedance matching Aspects of a method and system for LNA adjustment to compensate for dynamic impedance matching are provided. In this regard, an antenna matching network may be configured to maximize received signal strength for a determined frequency and an amplifier gain may be ad...	04/26/2011
7711337	Adaptive impedance matching module (AIMM) control architectures An embodiment of the present invention an apparatus, comprising an adaptive impedance matching module (AIMM) adapted to minimize the magnitude of an input reflection coefficient seen at an RFin port under boundary conditions of a variable load impedance Z...	05/04/2010
7616934	Switched impedance transformer for semiconductor circuits A method of providing an impedance match for an integrated semiconductor circuit to other microwave elements is provided by allowing the selection of one of a plurality of impedance matching ratios between the circuit and other elements. The tunable impedance match ...	11/10/2009
7403764	RF power delivery diagnostic system An RF power delivery diagnostic system is provided herein. The system comprises an RF power source (303), an impedance matching network (305), a plasma reactor (307) in electrical contact with the RF power source by way of the impedance matching...	07/22/2008
7395028	Switching apparatus and satellite antenna switching apparatus A satellite antenna switching apparatus has LNB ports to which LNBs are connected, receiver ports to which receivers that exchange signals with the LNBs are connected, cascade ports to which another switching apparatus is cascade-connected, and impedance circuits th...	07/01/2008
7302246	Programmable gain amplifier with self-adjusting offset correction Briefly, in accordance with one embodiment of the invention, a calibration circuit may detect a difference between first and second outputs of a differential output programmable gain amplifier to determine a dc offset at the differential output. In the event an offs...	11/27/2007
7286807	Receiver with a cascade of resonant amplifiers in the RF input stage Receiver comprising a cascade of first to N resonance amplifiers (SA1, SA2, SA3), an output thereof being coupled to signal processing means (TO, SD, PK, LP1, S) for deriving a baseband modulation signal. To improve the signal to noise ra...	10/23/2007
7260372	GPS receiver with reflection amplifiers An AM receiver incorporates an antenna, a transistor, a current source, and a power supply. The antenna is connected to a gate electrode of the transistor and through a link to a signal earth. In operation, the antenna receives radiation and generates a correspondin...	08/21/2007
7245890	High frequency variable gain amplification device, control device, high frequency variable gain frequency-conversion device, and communication device A high frequency variable gain amplification device 100 includes: a feedback circuit 103 capable of changing a feedback impedance to adjust the gain of an amplifier 101 in accordance with a control signal from a control device 200; and a ...	07/17/2007
7065328	Superregenerative AM demodulator An AM receiver incorporates an antenna, a transistor, a current source, and a power supply. The antenna is connected to a gate electrode of the transistor and through a link to a signal earth. In operation, the antenna receives radiation and generates a correspondin...	06/20/2006
6993297	Apparatus and methods for tuning antenna impedance using transmitter and receiver parameters According to some embodiments of the present invention, an impedance transformation circuit is provided for use with a transmitter, a receiver, and an antenna. The transmitter may provide transmission signals for transmission by the antenna. The antenna may provide ...	01/31/2006
6253070	Diode amplifier bypass circuit RF circuit includes an amplifier and a shunt. The shunt is controlled to provide a path around the amplifier for avoiding intermodulation distortion caused by overdriving the amplifier. The shunt is formed by a diode with capacitors that match to the RF c...	06/26/2001
6028647	Automatic gain control circuit using PIN diode capable of improving noise figure while improving frequency band characteristic and bidirectional CATV receiver including such circuit An input high frequency signal passes through a PIN diode having a variable high frequency resistance and is output from an AGC circuit. The PIN diode is connected so as to be biased forward between an AGC signal level and a fixed voltage level (such as g...	02/22/2000
5758270	Level control circuit for receiver 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 betw...	05/26/1998
5313661	Method and circuit arrangement for adjusting the volume in a mobile telephone Method and circuit arrangement for adjusting the volume in a mobile telephone. The telephone comprises a transceiver unit and on the other hand a physically separate operating device. A dc voltage level (DC) corresponding to the desired volume is adjusted...	05/17/1994
5270824	AGC circuit for double conversion digital television tuner An AGC system for a double conversion type tuner for tuning digital television signals includes a quadrature coupler that has two of its four ports each terminated by a pin diode. The pin diodes are driven conductive in response to an AGC voltage and cont...	12/14/1993
5175883	Receiving apparatus A receiving apparatus according to the present invention comprises a high frequency amplifying circuit for amplifying a signal received from an antenna by a gain in accordance with a control signal, a frequency conversion circuit for converting the output...	12/29/1992
4218774	Automatic gain control circuit An automatic gain control circuit for an AM receiver uses a signal having the same wavelength but reversed in phase with the signal in the antenna circuit. A variable resistance attenuator element such as a biased FET or PIN diode is used in the external ...	08/19/1980
4158814	Automatic overload protection system A variable impedance circuit is included between the antenna and the RF amplifier stage of a radio receiver portion of a transceiver and is responsive to a phase-inverted and amplified AGC signal to automatically protect the receiver from breaking down or...	06/19/1979
4097827	Constant impedance, constant phase pin diode with attenuator A constant impedance, constant phase PIN diode attenuator uses PIN diodes in a double pi configuration. A control voltage is applied simultaneously thereto thus attaining 40 dB attenuation without substantially varying phase and amplitude characteristics....	06/27/1978
3931576	Automatic gain control circuit for radio receiver An intermediate frequency amplifier stage includes a tuned circuit which is shunted by a transistor utilized as an emitter follower, the emitter follower being responsive to the amplitude of a detected signal to lower the "Q" of the tuned circuit as the a...	01/06/1976

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Class 455/248.1 - Constant or controlled input impedance