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| Number | Title | Issue Date |
| 7429891 | Method and system for low noise amplifier (LNA) gain adjustment through narrowband received signal strength indicator (NRSSI) Methods and systems for processing a plurality of signals are disclosed herein. Aspects of the method may comprise amplifying an input signal. The amplified input signal may be bandpass filtered. Amplification of the input signal may be adjusted based on only narrow... | 09/30/2008 |
| 7277511 | Two-stage non-linear filter for analog signal gain control in an OFDM receiver An analog signal gain control circuit(ASGC) for a digital radio HomePlug orthogonal frequency division multiplexing (OFDM) receiver includes a digital variable gain amplifier (DVGA) to control the gain of a received signal to achieve a desired signal amplitude to ma... | 10/02/2007 |
| 7190221 | Method and apparatus for maintaining constant linearity for a power amplifier over varying load conditions A circuit and method for applying a dynamically varying collector voltage to a power amplifier is presented. A desired output power is determined, and an input and output power of a power amplifier are measured. A processor determines, for the measured input power a... | 03/13/2007 |
| 7167055 | Voltage level detector for power amplifier protection control A voltage level detector (8) which activates itself by monitoring the voltage level (VSTB) at a standby pin (5) during power-up of an audio power amplifier (10), and can detect fault conditions of an output block (2), such as a... | 01/23/2007 |
| 7148747 | Apparatus for automatically controlling a gain of a power amplifier and associated methods An apparatus for automatically controlling a gain of a power amplifier includes a reception-signal detecting unit which detects a reception signal; a reference-voltage generating unit which generates a reference voltage; a gain control voltage detecting unit which c... | 12/12/2006 |
| 7142060 | Active splitter for multiple reception units An active splitter is disclosed for splitting an input signal into a plurality of split output signals. The active splitter may include a plurality of active circuits connected in parallel that produce the plurality of split output signals from the received input si... | 11/28/2006 |
| 7142894 | Mobile phone for voice adaptation in socially sensitive environment This invention describes a mobile phone with a means of measuring a background sound level of an environment. When a user either initiates or receives a phone call, sound levels before and during the call are compared. Once it is decided that the voice is too loud b... | 11/28/2006 |
| 7130364 | Interference dependent ADC headroom adjustment A method, system, and apparatus for adjusting the headroom for a received signal in a radio receiver when the received signal includes a target signal and an interference signal. An amplifier coupled with the received signal outputs an amplified signal, and the ampl... | 10/31/2006 |
| 7126420 | R.F. output power control An R.F. power amplifier circuit comprising a power control loop is described. The power control loop includes an R.F. power amplifier having a power control input and a power supply input as well as at least one feedback path coupled between the power control input ... | 10/24/2006 |
| 7049885 | Volume adjustment device, digital amplifier, and digital signal reproducing device A digital amplifier causes a gate drive circuit to drive output transistors, and switches a power source voltage supplied from a variable voltage power source, thereby amplifying an amplitude of a 1-bit digital signal outputted from a ΔΣ block. A variable voltage ... | 05/23/2006 |
| 7042282 | Power control and modulation of switched-mode power amplifiers with one or more stages This invention controls and modulates switched-mode power amplifiers to enable the production of signals that include amplitude modulation (and possibly, but not necessarily, phase modulation), the average power of which may be controlled over a potentially wide ran... | 05/09/2006 |
| 6954104 | Method and system for monitoring a deliverable radio frequency power of an amplifier operable on a monolithic microwave integrated circuit A method and system are described for monitoring a deliverable radio frequency (RF) power of an amplifier operable on a monolithic microwave integrated circuit (MMIC). According to an exemplary embodiment, circuitry is configured to capture, on the MMIC, a first por... | 10/11/2005 |
| 6954623 | Load variation tolerant radio frequency (RF) amplifier A power amplifier having a phase shift and impedance transformation element is disclosed. The power amplifier comprises a plurality of amplification paths, a first phase shift element at an input of each amplification path and a second phase shift element at an outp... | 10/11/2005 |
| 6937102 | Low bias current/temperature compensation current mirror for linear power amplifier A power amplifier circuit whose performance is optimized by operating its stages in substantially close to a Class B mode by reducing quiescent current during low driver signal levels. As the driver signal amplitude increases, the operation of the amplifier is confi... | 08/30/2005 |
| 6927645 | Electronic component structured to compensate for cable losses and method of production An electronic component and a method of its structuring wherein the component is intended to compensate for “cable loss” attributable to the decay of certain signal characteristics including both frequency and amplitude decay over long distances of coaxial cable... | 08/09/2005 |
| 6853242 | Power supply based audio compression for digital audio amplifier A gain control at the input monitors an input signal and a supply voltage, which drives an output. The gain control adjusts the gain to compress the input signal when the supply voltage decreases in magnitude and/or the input signal is of such magnitude to cause the... | 02/08/2005 |
| 6812789 | RF power amplifier digital gain flattening over multiband frequencies A method and apparatus for maintaining approximately constant gain of an RF power amplifier includes a digital control module for modifying gain parameters of the power amplifier to provide a constant fixed power gain over the entire frequency range of operation. Th... | 11/02/2004 |
| 6791406 | Power servo-loop, an RF signal amplifier circuit, and an RF signal transmitter fitted with such a circuit The present invention relates to a power servo-loop in particular for controlling a power amplifier, the loop comprising a detection circuit (100) having coupling means (1) for taking off RF signals, and a detection unit (400) for delivering a d... | 09/14/2004 |
| 6765436 | Power supply based audio compression for digital audio amplifier A gain control at the input monitors an input signal and a supply voltage, which drives an output. The gain control adjusts the gain to compress the input signal when the supply voltage decreases in magnitude and/or the input signal is of such magnitude to cause the... | 07/20/2004 |
| 6741128 | Distortion canceling circuit There is provided a distortion canceling circuit for reducing an unbalance between a higher and a lower 3rd order distortion at frequencies of (2·f2−f1) and (2·f1−f2), respectively, the distortions being generated by an amplifier wh... | 05/25/2004 |
| 6683496 | System and method for minimizing dissipation in RF power amplifiers The variable power supply to an amplifier in an electrical circuit is dynamically controlled through the use of a lookup table responsive to one or more operating conditions of the electrical circuit. The lookup table is indexed by one or more of the oper... | 01/27/2004 |
| 6608523 | System and method for producing a pilot signal in a distortion reduction system A distortion reduction system uses upstream signal information, such as the carrier frequencies in an input signal, to adjust at least one frequency for a pilot signal to be injected into the distortion reduction system and to be detected at the output of... | 08/19/2003 |
| 6545536 | Biasing circuit for VGS drift and thermal compensation of a power device The present invention proposes a method for adjusting a parameter (IDQ) of a power device (1) by changing an input signal (VG) to said power device, said method comprising the steps of taking (S2) a sample of an output signal (POUT) of said power device (... | 04/08/2003 |
| 6525605 | Power amplifier system having frequency and amplifier failure compensation A power amplifier system for use in amplifying an RF input signal exhibiting a given operating frequency within a known range of frequencies. The system includes a signal modulator that receives and modifies the input signal and provides therefrom a modif... | 02/25/2003 |
| 6304145 | Large signal amplifier gain compensation circuit A power amplifier to process an input signal includes an amplifying device operating at a quiescent point and a bias network that varies the quiescent point according to a frequency of the input signal. In a variant of this power amplifier, the bias netwo... | 10/16/2001 |
| 6246285 | AGC circuit based on a peak detection system In an automatic gain control (AGC) circuit based on a peak detection system having two filters, a voltage comparator selects one of two voltages and compares the selected voltage with a detection signal output from a wave detector. A second AGC filter sel... | 06/12/2001 |
| 6147555 | Amplification system having mask detection A method and apparatus reduce the out-of-band frequency components of an RF amplified signal, preferably a CDMA signal, which has a carrier frequency which is not known in advance. The apparatus and method feature locating the frequency of the incoming si... | 11/14/2000 |
| 6111461 | High frequency amplifier circuit A high frequency amplifier circuit includes the voltage source supplying the power source voltage on the output side of the high frequency amplifying active element. The high frequency amplifier is constructed with a voltage detector detecting a differenc... | 08/29/2000 |
| 6072824 | Circuit arrangement for reducing intermodulation in a bandpass filter system A circuit arrangement that reduces selected intermodulation. The circuit arrangement includes a signal amplifier coupled to a bandpass filter via an electrical path. Signal energy outside the passband is reflected back into the amplifier and causes interm... | 06/06/2000 |
| 5990746 | Amplifier system An amplifier system for a radio receiver, comprising: amplifier means for amplifying a signal applied to an amplifier input to generate an amplifier output signal; and control means for sensing the amplifier output signal and, in response to a relatively ... | 11/23/1999 |
| 5923215 | Linearized amplifier A microprocessor detects input power and output power of a two transistor, Class AB amplifier, and provides an adapted bias level of the transistors which has been adapted from detected input power. The gain of the amplifier is maintained by the microproc... | 07/13/1999 |
| 5814752 | Musical instrument crossover circuits and method of using same A musical instrument amplifier system (FIGS. 1 and 2) with a frequency selective crossover circuit (10) using passive band pass filters (36, 44) to separate the amplified signals from the power amplifier (14) of an amplifier system (12) into low frequency... | 09/29/1998 |
| 5712593 | Linear power amplifier with distortion detection A power amplifier (10) suitable for satellite cellular communication systems provides highly efficient linear amplification of noise-like RF signals that have multiple carriers spread over a large instantaneous bandwidth. The amount of distortion present ... | 01/27/1998 |
| 5694082 | Circuit arrangement for determining intermodulation products In an amplifier, which amplifies high-frequency communication signals, there develops odd-order intermodulation products which, because of the identical frequency spacing of the channels, fall into directly adjacent useful channels. In order to keep these... | 12/02/1997 |
| 5546050 | Radio frequency bus leveling system A bus leveling system for automatically monitoring and maintaining the amplitude of a radio frequency (RF) signal carded on a bus. A two-stage variable gain amplifier (64) is connected in series with the bus. Each stage of the variable gain amplifier is c... | 08/13/1996 |
| 5220287 | Voice processing apparatus A voice processing apparatus, comprising an input terminal to receive electrical voice signals; a controlled-gain amplifier to amplify the electrical voice signals in dependence on a control signal to provide an output signal at an output terminal; and a contr... | 06/15/1993 |
| 4468630 | Wide-band amplifier for driving capacitive load A wide-band amplifier for driving a capacitive load includes an amplifier of a complementary push-pull circuit receiving and amplifying an input signal to produce an output signal for driving the capacitive load, and a controller for controlling bias curr... | 08/28/1984 |
| 4293937 | Borehole acoustic telemetry system In a borehole acoustic telemetry system for acoustically transmitting data over a pipe suspended in a borehole, the level of noise in the data stream is inherently high, making the use of precise frequencies advantageous to provide useful data. A first tr... | 10/06/1981 |
| 4281295 | Noise reducing apparatus A frequency region split type noise reducing apparatus, comprising a compressor and an expander; the compressor (or the expander) including a plurality of frequency region splitting filters for splitting the frequency range of the signal into a plurality ... | 07/28/1981 |
| 4219780 | Gain controlled amplifier circuits Apparatus for controlling the gains of a pair of gain-matched amplifiers includes means for applying to each amplifier a pilot tone in the form of an exponentially-decaying periodic signal. The apparatus also includes three control loops, one for comparin... | 08/26/1980 |
