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| Number | Title | Issue Date |
| 7605652 | Loop gain equalizer for RF power amplifier The output power of an RF power amplifier is controlled using a feedback loop including a differential integrator for controlling the amplifier's bias voltage. The gain of integration in the differential integrator is varied so as to compensate for variations in the... | 10/20/2009 |
| 7408407 | Low noise variable gain amplifier The present invention provides systems and methods for asymmetrically varying gain in a low noise amplifier. The amplifier includes a first stage amplifier, a plurality of second stage amplifiers coupled to the first stage amplifier, a comparator coupled to one of t... | 08/05/2008 |
| 7365599 | Glitch-free controllable RF power amplifier A power amplifier circuit for amplifying an input RF signal with respect to a specified RF output power includes an input terminal for supplying the input RF signal to be amplified, an output terminal for the RF signal with the output power specified, an amplificati... | 04/29/2008 |
| 7352244 | Electronics parts for high frequency power amplifier This invention provides an electronic part for high frequency power amplification (RF power module) which will automatically perform the precharge level setting for proper output power at start of transmission without requiring the software process for precharging t... | 04/01/2008 |
| 7349017 | Color sensor circuit with integrated programmable gain selection A color sensor is implemented on a single integrated circuit chip. The color sensor includes a plurality of color sensor circuits and a gain selection control. Each color sensor circuit in the plurality of color sensor circuits includes a light detector, an amplifie... | 03/25/2008 |
| 7339437 | Ultra-wideband constant gain CMOS amplifier Circuitry and methods for improved amplifiers with large bandwidth and constant gain are provided. The combination of a synthetic inductive drain load and a bridged-T matching network provide amplifiers that can drive a substantial capacitive load with the above men... | 03/04/2008 |
| 7340229 | High frequency amplification circuit and mobile communication terminal using the same A gain control circuit 12 comprises an FET 41 operating as a variable resistor. A gate terminal of the FET 41 is supplied with a control voltage VC applied to a gain control terminal 23. A source terminal and a drain terminal of the FET | 03/04/2008 |
| 7298212 | Automatic level control circuit with improved attack action An automatic level control circuit comprises a gain controllable amplifier, a comparing and outputting circuit which compares a level of an output signal from the gain controllable amplifier with a reference level and outputs a result of comparison as a comparison r... | 11/20/2007 |
| 7298208 | Automatic level control circuit with improved recovery action An automatic level control circuit comprises a level detection circuit which detects attack detection to sense a detection level greater than a predetermined level and recovery detection to sense a detection level smaller than the predetermined level, and a gain con... | 11/20/2007 |
| 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 |
| 7202748 | Ultra-wideband constant gain CMOS amplifier Circuitry and methods for improved amplifiers with large bandwidth and constant gain are provided. The combination of a synthetic inductive drain load and a bridged-T matching network provide amplifiers that can drive a substantial capacitive load with the above men... | 04/10/2007 |
| 7161511 | Linearization system and method A system for training a linearization compensation model includes a tone generator for providing at least two different RF tones, receiver path components for processing the RF tones, an analog-to-digital converter for converting the processed RF tones into digital ... | 01/09/2007 |
| 7146150 | Mixing circuit with low noise factor when operating at low frequency The invention relates to a mixing circuit for mixing a first signal RF with a second signal LO including a conversion stage T3 to convert the first signal RF into a current, a mixing core T1 and T2 to mix said current with the second signal LO, ... | 12/05/2006 |
| 7138874 | Two-stage amplifier A two-stage amplifier includes a first stage and a second stage that are DC-connected through a coupling capacitor Cp. A charge pump generates a bias voltage Vp that is applied across the coupling capacitor Cp leads to maintain the time average of the voltage across... | 11/21/2006 |
| 7123097 | Ultra-wideband constant gain CMOS amplifier Circuitry and methods for improved amplifiers with large bandwidth and constant gain are provided. The combination of a synthetic inductive drain load and a bridged-T matching network provide amplifiers that can drive a substantial capacitive load with the above men... | 10/17/2006 |
| 7092686 | Automatic transmit power control loop A transmitter includes a coupler (318) to measure output power. The output power is compared to a set value and a threshold. If the power is above the threshold, the gain of an output amplifier (316) is adjusted toward the set value. If the power is be... | 08/15/2006 |
| 6995806 | Amplifier with a universal automatic gain control circuit An amplifier (125) includes a gain stage (210) for amplifying a signal received by the amplifier (125). The amplifier (125) also includes an AGC circuit (400) that adjusts the amplification of the gain stage (210) and that i... | 02/07/2006 |
| 6946914 | Ultra-wideband constant gain CMOS amplifier Circuitry and methods for improved amplifiers with large bandwidth and constant gain are provided. The combination of a synthetic inductive drain load and a bridged-T matching network provide amplifiers that can drive a substantial capacitive load with the above men... | 09/20/2005 |
| 6914987 | Audio amplifier with voltage limiting in response to spectral content Audio signals are reproduced with consistent perception of total harmonic distortion even with varying spectral content of a particular audio signal without separately limiting different frequency bands within the audio signal. A distortion threshold representative ... | 07/05/2005 |
| 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 |
| 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 |
| 6744313 | Power amplifier driver and method of using A power amplifier driver (16) provides control voltage inputs to power amplifier (14) at terminal (OUT). An output power control loop is implemented through directional coupler (20) and power amplifier driver (16). Power amplifier driver ... | 06/01/2004 |
| 6693488 | Apparatus and method for a fast bandwidth switching circuit in a power amplifier control circuit An apparatus and method is directed to a power amplifier control circuit that includes a bandwidth switching circuit. The power amplifier control circuit can be used in a GSM EDGE system for controlling the output power of a communication signal. The loop... | 02/17/2004 |
| 6690232 | Variable gain amplifier A variable gain amplifier device comprises a variable gain amplifier circuit which amplifies a difference between an input signal and a feedback signal to output an output signal, a feedback circuit which supplies the feedback signal to the variable gain ... | 02/10/2004 |
| 6670850 | Ultra-wideband constant gain CMOS amplifier Circuitry and methods for improved amplifiers with large bandwidth and constant gain-are provided. The combination of a synthetic inductive drain load and a bridged-T matching network provide amplifiers that can drive a substantial capacitive load with th... | 12/30/2003 |
| 6621341 | Diagnostic medical ultrasound systems having a method and circuitry for front-end gain control A system and method of processing received signals in an ultrasound imaging system is disclosed. In the system, the received signals are amplified by means of a gain controlled amplifier, and the gain of the amplifier is varied, by varying the load capaci... | 09/16/2003 |
| 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 |
| 6617931 | Two-stage amplifier A two-stage amplifier includes a first stage and a second stage that are DC-connected through a coupling capacitor Cp. A charge pump generates a bias voltage Vp that is applied across the coupling capacitor Cp leads to maintain the time average of the vol... | 09/09/2003 |
| 6603350 | Regulator device for controlling the power of a transmitter The invention relates to a device for transmitting radiofrequency signals using a power amplifier. The power amplifier is connected to a power regulation loop for regulating its gain in such a manner as to bring the output power level to a desired nominal... | 08/05/2003 |
| 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 |
| 6549068 | System and method for operating an RF power amplifier Method for operating an RF power amplifier (100; 200) with an approximately linear characteristic by adjusting at least one operating parameter of the amplifier or at least one active component of this amplifier, wherein a minimum collector or drain curre... | 04/15/2003 |
| 6469577 | Automatic level controlling circuit A limiter circuit is provided for limiting the output from a comparing circuit so that the attenuating characteristic curve of an amplifying circuit 11 relative to a detected voltage Vo has an inflection point. Namely, since the limiter circuit serves to ... | 10/22/2002 |
| 6437643 | Variable gain amplifier A variable gain amplifier comprises a main amplifier circuit whose gain is controllable and which amplifies a difference signal between an input signal and a feedback signal, a feedback amplifier circuit whose gain is controllable and which amplifies an o... | 08/20/2002 |
| 6433633 | Automatic gain control system with signal presence conditioning An automatic gain control system comprises a system input and a system output, detecting means adapted to convert an input signal into a signal level indication, which detecting means includes a rectifier and a 60 tap FIR filter with a Chebychev window, a... | 08/13/2002 |
| 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 |
| 6411161 | AC coupling circuit The invention provides an AC coupling circuit for receiving an output signal from a signal processing circuit having a first differential amplifier which has an inverting input and a non-inverting input, and for transmitting the output signal to a stage s... | 06/25/2002 |
| 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 |
| 6285253 | Systems, methods, and circuits for reducing HUM modulation in amplifiers Voltage-induced hum modulation in an amplifier can be caused when shunt capacitors begin to saturate and enter their non-linear region of operation. Bypass coils within the amplifier are magnetically coupled to the shunt capacitors and exacerbate hum modu... | 09/04/2001 |
| 6242981 | AGC circuit To make variable time constant of an AGC loop of an AGC circuit, there is provided an AGC circuit including a control circuit for controlling a level of an input signal and outputting an output signal, a rectifying circuit for rectifying the output signal... | 06/05/2001 |
