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| Number | Title | Issue Date |
| 8115552 | Amplifier circuit with step gain A step gain amplifier has an amplifier with an input and an output, and a bias circuit connected to the input and to a bias node. A passive feedback circuit using only passive elements connects the output to the input. A control circuit is connected to the bias circ... | 02/14/2012 |
| 7671680 | Electronic circuit An electronic circuit includes an input terminal, a transimpedance amplifier connected to the input terminal and including an amplifier and a feedback resistor, a first time constant circuit smoothing an output from the transimpedance amplifier, a gain control circu... | 03/02/2010 |
| 7663441 | Low noise amplifier A low noise amplifier includes a main amplifier configured to amplify a first input signal to generate a first output signal and an auxiliary amplifier configured to amplify a second input signal to generate a second output signal. The auxiliary amplifier is coupled... | 02/16/2010 |
| 7352406 | Signal acquisition following transient signal interruption A television monitor display with video signal processing comprises a source (SM) of a video display signal (Y) including a sync component (S). A video processor (U1) is coupled to process the video display signal (Y). A sync separator (SS) is coupled to gene... | 04/01/2008 |
| 7336130 | Attenuator, variable gain amplifier using the same, and electronic equipment An attenuator attenuates input signals and outputs the signals to an amplifier arranged to amplify signals applied to two input terminals. The attenuator includes first and second output terminals to be respectively connected to the two input terminals of the amplif... | 02/26/2008 |
| 7239856 | Apparatus and method for compensating gain of an automatic gain controller An apparatus and method for compensating the gain of an Automatic Gain Controller (AGC) for stabilizing the reception power of discontinuously transmitted packet data in a mobile communication system are disclosed. A compensation controller receives an AGC value fro... | 07/03/2007 |
| 7233200 | AGC circuit, AGC circuit gain control method, and program for the AGC circuit gain control method The present invention relates to an AGC circuit, a AGC circuit gain control method, and a program for the AGC circuit gain control method, and may be applied to IC recorders, for example, as a portable recording/reproducing device, in order to ameliorate problems of... | 06/19/2007 |
| 7221226 | Amplifying apparatus with automatic level controller A window comparator compares a level of an output signal with an attack reference level, and outputs an attack signal based upon an attack reference comparison result signal thus obtained, and compares the output signal level with a recovery reference level, and out... | 05/22/2007 |
| 7215933 | Local transmitter output power control system for wireless applications A local transmitter power control system for a radio frequency transmitter of a wireless local area network device includes a transmitter that transmits RF signals. A sensor detects at least one of amplitude and power of said RF signals and generates a sensed signal... | 05/08/2007 |
| 7205841 | Automatic gain control with three states of operation A method and apparatus for an automatic gain control (AGC) loop that utilizes freezing and unfreezing states. A freezing process moves the AGC into a TRANSITION state from a NORMAL state, based on net change of VGA gain control codes over a monitoring time window. T... | 04/17/2007 |
| 7187231 | Apparatus, methods and articles of manufacture for multiband signal processing Apparatus, methods and articles of manufacture for multiband transmitter power amplification are provided wherein one or more amplifying devices, of which at least one may be one or more current sources, have impedances matched for different input and output frequen... | 03/06/2007 |
| 7183845 | Gain control methods and systems in an amplifier assembly A Variable Gain Amplifier (VGA) amplifies an input signal according to a gain, to produce an amplified signal. A detector module detects a power indicative of a power of the amplified signal. A comparator module compares the detected power to a high threshold, a low... | 02/27/2007 |
| 7170867 | Radio frequency data communications device A radio frequency identification device includes an integrated circuit including a receiver, a transmitter, and a microprocessor. The receiver and transmitter together define an active transponder. The integrated circuit is preferably a monolithic single die integra... | 01/30/2007 |
| 7130546 | Optical receiver An optical receiver controls the amplitude of a light signal at a constant level so as to be constant for improvements in the quality of signal regeneration and reliability. A modulation part modulates the amplitude of the light signal. An opto-electric conversion p... | 10/31/2006 |
| 7123089 | Power amplifier with pulse differentiating circuit An amplifier includes a plurality of power amplifier elements connected in cascaded multiple stages, a first bias power supply, a second bias power supply, a switching circuit configured to switch a first output supplied from the first bias power supply in response ... | 10/17/2006 |
| 7092682 | Electronic circuit, modulation method, information processing device, and information processing method A shaped-wave application section inputs a first pulse signal corresponding to transmission data output from a transmission data output section, and applies, to a modulation and amplification section, a signal wave corresponding to a second pulse signal such that th... | 08/15/2006 |
| 7088183 | Bias circuit A bias circuit supplying a bias current to a first transistor includes a second transistor having a collector connected to a first power supply and having an emitter connected to a base of the first transistor, a third transistor having a collector connected to the ... | 08/08/2006 |
| 7079043 | Radio frequency data communications device A radio frequency identification device comprises an integrated circuit including a receiver, a transmitter, and a microprocessor. The receiver and transmitter together define an active transponder. The integrated circuit is preferably a monolithic single die integr... | 07/18/2006 |
| 7076223 | Gain control device for packet signal receiver In a gain control device for packet signal receiver, a variable gain amplifier amplifies an input signal with a gain corresponding to a control voltage applied thereto, and a power detector detects output power of the variable gain amplifier. A packet detection circ... | 07/11/2006 |
| 7068100 | Gain control methods and systems in an amplifier assembly A Variable Gain Amplifier (VGA) amplifies an input signal according to a gain, to produce an amplified signal. A detector module detects a power indicative of a power of the amplified signal. A comparator module compares the detected power to a high threshold, a low... | 06/27/2006 |
| 7065336 | Analog base band unit for a RF receiver and method for using the same A feedback circuit for amplification of the output signal of an analog front end and suppression of its DC and low frequency components comprises a variable gain amplification unit (2) controlled by a gain control signal and a reverse path unit (6) com... | 06/20/2006 |
| 7039202 | Microphone unit A microphone unit capable of suppressing the sensitivity reduction due to a parasitic capacitance that occurs depending on the structure of an electret capacitor, can be realized by the following manner. Specifically, an output signal (Vout) that is the inverted out... | 05/02/2006 |
| 7003057 | Reception AGC circuit A reception AGC circuit includes a high-speed power calculating circuit for calculating the power of an input signal at a short period, a normal power calculating circuit for calculating the power at a normal period, a circuit for receiving a power calculation resul... | 02/21/2006 |
| 6975172 | Smart voltage rail reduction audio amplifier An audio amplifier is provided that adjusts the supply voltage rails communicated to a power amplifier circuit according to the circuit's output. The amplifier compares the output voltage from the power amplifier to a predetermined voltage range to determine if the ... | 12/13/2005 |
| 6975845 | Direct conversion receiver architecture Disclosed is a method for operating a mobile station (100) that includes an RF receiver (220) having an RF front end (1A) followed by a base band section (1B). The base band section includes an AGC block (7′) that contains a DC b... | 12/13/2005 |
| 6972628 | Integratable, voltage-controlled RF power amplifier Disclosed herein is an integratable power amplifier having a variable bias voltage, in which a first bias controller detects the amplitude of an RF signal and outputs a DC signal varying with the detected amplitude based on the non-linearity of a rectification trans... | 12/06/2005 |
| 6954624 | Transmitter and wireless communication device having a low power bypass branch A transmitter into which a modulated signal (TX) is fed, the transmitter comprising an adjustable amplifier (1) for adjusting transmission power level, the modulated signal (TX) being fed into to the input of the amplifier (1), an amplification branch ... | 10/11/2005 |
| 6927632 | Low distortion compression amplifier A low distortion compression amplifier comprising an amplifier circuit having an input and an output, wherein an input signal is received at the input and amplified in accordance with a gain to form an output signal at the output. The amplifier circuit further compr... | 08/09/2005 |
| 6844780 | Automatic gain control circuit An automatic gain control circuit integrally fabricated on a semiconductor substrate. An AGC circuit 17 controls the gain of an intermediate-frequency amplifier circuit 15 so that the average level of the output signal (sound signal) of an AM detector ... | 01/18/2005 |
| 6795694 | Automatic gain control system Discrete data of a base-band signal obtained by a control unit is multiplied by data equivalent to a time constant of a wave detector unit, thus enabling the deterioration in a detection voltage generated during detection of a modulation wave having a marked variati... | 09/21/2004 |
| 6784742 | Voltage amplifying circuit A voltage amplifying circuit (100) that may have a selectable gain has been disclosed. Voltage amplifying circuit (100) may include a voltage amplifier (2) and a gain changing unit (7). A gain changing unit (2) may be capable of ch... | 08/31/2004 |
| 6624700 | Radio frequency power amplifier for cellular telephones A bias circuit having a relatively long time constant improves the linearity of a radio frequency power amplifier of a spread spectrum mobile telephone by causing a power transistor of the amplifier to operate in class A or AB mode. The power amplifier th... | 09/23/2003 |
| 6621345 | Gain control device for packet signal receiver In a gain control device for packet signal receiver, a variable gain amplifier amplifies an input signal with a gain corresponding to a control voltage applied thereto, and a power detector detects output power of the variable gain amplifier. A packet det... | 09/16/2003 |
| 6586994 | Variable gain and low noise amplifier for received signals in imaging apparata The invention relates to a variable gain and low noise amplifier for received signals in ultrasound or nuclear magnetic resonance imaging apparata. This variable gain and low noise amplifier comprises at least one amplifier unit having at least one input ... | 07/01/2003 |
| 6573786 | Electronic devices comprising an audio amplifier and methods for controlling such electronic devices An electronic device comprises an audio amplifier, a main microprocessor and a user interface microprocessor. The UI microprocessor has a control pin for muting the audio amplifier. A muting circuit is provided for muting the audio amplifier when a signal... | 06/03/2003 |
| 6476677 | Power amplifier saturation detection and compensation A system for detecting and compensating for a saturation condition of a power amplifier where an error signal is produced by differencing a signal representative of or derived from a control signal for controlling the shape of the output of the power ampl... | 11/05/2002 |
| 6472938 | Automatic level controlling circuit In an automatic level controlling circuit, an output from a full-wave rectifying circuit 12 is supplied to a first and a second time constant circuit. The first time constant circuit includes a first amplifier 22 and a capacitor 15. The second time consta... | 10/29/2002 |
| 6426677 | Linearization bias circuit for BJT amplifiers A linearization bias circuit for an RF BJT amplifier including a reference circuit, a current device and a transconductance amplifier. The linearization bias circuit controls the operating point of the BJT amplifier based on signal level of an input RF si... | 07/30/2002 |
| 6420928 | AC coupled pre-amplifier for burst signal An AC-coupled pre-amplifier is provided for amplifying a signal received in a packet transmitted in burst mode. The pre-amplifier provides a fast time constant for a driven edge of a received signal and a slower time constant for a undriven edge of the re... | 07/16/2002 |
| 6388526 | Methods and apparatus for high performance reception of radio frequency communication signals Circuits for continuously varying the gain control for a low noise amplifier (LNA) of a wireless receiver are described. The gain, input third order intercept point (IIP3) and noise figure (NF) of an LNA are continuously varied according to the received p... | 05/14/2002 |
