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| Number | Title | Issue Date |
| 7357594 | Method of rejuvenating road surfaces with polymer modified asphalt emulsions A composition for rejuvenating asphalt pavement according to the present invention comprises an asphalt binder, water, a cationic surfactant, a recycling agent, and a cationic, co-agglomerated styrene butadiene rubber latex, which includes sulfur and a vulcanizing a... | 04/15/2008 |
| 7167718 | Transmission power control apparatus, transmission power control method, and mobile station A transmission power control apparatus for a wireless communication apparatus which reduces a power value of a signal input to a power amplifier to the maximum allowable input power value of the power amplifier or below is provided in which the transmission power co... | 01/23/2007 |
| 7116174 | Base current compensation circuit for a bipolar junction transistor A method and apparatus for compensating a base current of a bipolar junction transistor by replicating operating conditions of the BJT in a compensating circuit. An output current of the compensating circuit is fractionally related to the base current and thus can b... | 10/03/2006 |
| 6747515 | Circuit for automatic regulation of a differential amplifier's gain A circuit for regulating the gain of a variable differential gain amplifier. In one embodiment, a fully differential amplifier amplifies the outputs of the variable gain amplifier. The outputs of the fully differential amplifier are applied to a three input comparat... | 06/08/2004 |
| 6625470 | Transmitter A dual band transmitter (1) including: a lower band power amplifier (2) and a higher band power amplifier (3), a lower band transmit path (4) between the output of the lower band power amplifier (2) and a combining means (8); and a higher band transmit pa... | 09/23/2003 |
| 6529072 | Predistortion-based amplifier, transmitter and envelope detector A predistortion-based amplifier which compensates for distortions generated by the amplifier when a modulated wave signal is amplified thereby in accordance with a predistortion scheme, based on envelope information of the modulated wave information. An e... | 03/04/2003 |
| 6297698 | Circuit for automatic regulation of a differential amplifier's gain A circuit for regulating the gain of a variable differential gain amplifier. In one embodiment, a fully differential amplifier amplifies the outputs of the variable gain amplifier. The outputs of the fully differential amplifier are applied to a three inp... | 10/02/2001 |
| 6047167 | Output power control device A comparator (5) compares a detected voltage obtained by detecting an output power of a nonlinear amplifier (2) with a reference voltage to generate a control voltage for the nonlinear amplifier (2). The control voltage is converted into such a control vo... | 04/04/2000 |
| 5805022 | Circuit for automatically regulating the gain of a differential amplifier A circuit having a double half-wave rectifier connected to the outputs of a differential amplifier in order to produce two quantities dependent on the amplitudes of the half-waves of the output signal of the amplifier. Two comparators each having an input... | 09/08/1998 |
| 5696833 | Hearing aid having externally controlled amplifier gain and method of using same An electronic device is set forth that allows external control of a controllable electronic function of the device. The device includes a function circuit for implementing an electronic function in response to a signal at a function control signal input. ... | 12/09/1997 |
| 5672999 | Audio amplifier clipping avoidance method and apparatus An audio amplifier clipping avoidance apparatus (140) identifies signal segments of an audio signal that can have an amplitude peak greater than a particular amplifier clip avoidance threshold (530). A scaling factor is determined for each signal segment ... | 09/30/1997 |
| 5606285 | Power control circuit for use with transmitter A power control circuit having a saturation preventing control loop including a variable gain amplifier, an RF power amplifier, a directional coupler, a detecting circuit, a comparator, a switch, and an adder. When the signal level of an output signal of ... | 02/25/1997 |
| 5561288 | Biasing voltage cancellation circuit having a plurality of switches serially connected to a capacitor A highly sensitive optical receiver where one terminal of the photodiode of the receiver is connected to a negatively biased amplifier while the other terminal of photodetector is connected to a positively biased amplifier, where such connections automati... | 10/01/1996 |
| 5507023 | Receiver with an AGC circuit capable of expanding a dynamic range A receiver comprises an AGC circuit including a low noise amplifier for amplifying a reception input signal and an AGC amplifier, a level detection circuit for producing a strength indication signal indicative of an input field strength, and a demodulator... | 04/09/1996 |
| 5483198 | Method and apparatus for controlling amplifier power A method and apparatus for controlling an amplifier power output, in particular, a transmitter RF Amplifier includes a control circuit connected to the RF Amplifier. The control circuit derives a control signal from a shaper circuit and this control signa... | 01/09/1996 |
| 5434539 | Unity-gain linear-fader control for VCA Disclosed is a control circuit which provides a control signal to a control terminal of a voltage controlled amplifier (VCA), such as a SSM-2018 VCA manufactured by Analog Devices, such that a signal input to the VCA is amplified between full gain and ful... | 07/18/1995 |
| 5424679 | +12dB gain linear-fader control for VCA Disclosed is a control circuit which provides a control signal to a control terminal of a voltage controlled amplifier (VCA), such as a SSM-2018 VCA manufactured by Analog Devices, such that a signal input to the VCA is amplified between +12 dB gain and f... | 06/13/1995 |
| 5412341 | Power control apparatus and method for a radio frequency amplifier A power controller for a class C radio frequency power amplifier that exhibits an output power threshold, including a detector circuit (299) that detects a output power level to provide a level signal when the radio frequency power amplifier has achieved ... | 05/02/1995 |
| 5404115 | Variable gain amplifier An amplifying system for variably amplifying electrical input signals, depending on magnitudes of those signals, with the variation in amplification being selectable as is substantially the maximum output signal value.... | 04/04/1995 |
| 5384547 | Apparatus and method for attenuating a multicarrier input signal of a linear device The apparatus first measures the peak power of a multichannel signal, or representation thereof. The peak power is compared with one or more peak power threshold values. If the measured peak power exceeds a threshold value, the multichannel signal is atte... | 01/24/1995 |
| 5363057 | Control device for power amplifier A control device for a power amplifier controls the power amplifier upon a rise in output power based on a power variation pattern stored in storage means to suppress a power overshoot which occurs upon a rise in output power.... | 11/08/1994 |
| 5337006 | Output level control circuit for use in RF transmitter An output level control circuit for radio-frequency transmitter which intermittently transmits radio-frequency carrier waves such as seen in the TDMA radio communication system and the digital cellular mobile telephone system. The variable gain amplifier ... | 08/09/1994 |
| 5302913 | Power amplifying circuit capable of producing an output signal having a desired waveform For use in amplifying an input signal having an input electric power in response to an amplification control signal to produce an output signal having an amplified electric power and a desired waveform, a power amplifying circuit comprises a reference sig... | 04/12/1994 |
| 5179353 | Power control circuit used for both analog/digital dual mode A power control circuit used for both analog/digital dual mode is disclosed which comprises a switching circuit (17) for applying the feedback signal to the gain control terminal (40) of the power amplifier (2) and applying a fixed bias voltage to the att... | 01/12/1993 |
| 5159283 | Power amplifier The power amplifier in accordance with the invention is responsive to a power level control signal so as to amplify radio frequency signals to define any one of a plurality of amplifier output power envelopes. The power amplifier comprises means for gener... | 10/27/1992 |
| 5132634 | Amplifier circuit with envelope smoothing A closed loop amplifier circuit (100) having an on state (202) and an off state (204) is disclosed. The amplifier circuit (100) includes an Automatic Gain Control (AGC) circuit (116). The AGC circuit (116) controls the rate of change in the output power (... | 07/21/1992 |
| 4870372 | AGC delay on an integrated circuit Circuitry is disclosed for staggering the onset of gain reduction in a series of cascaded gain stages as a function of received signal strength. The staggering is effected by controlling the area ratio between corresponding components in two or more AGC c... | 09/26/1989 |
| 4835484 | Gain control circuit for suppressing Larsen effect in a loudspeaker telephone A gain control circuit (10) of an amplifier (3) for listening via a loudspeaker (4) in an apparatus, more specifically a telephone set, which includes a microphone (1), in order to suppress the Larsen effect. The gain control circuit comprises first contr... | 05/30/1989 |
| 4691172 | MOS Switched capacitor automatic gain control circuit An apparatus for adjusting the amplitude of an electronic signal to a predetermined level in a MOS integrated circuit device. A variable amplifier comprising a plurality of operational amplifier stages whose gain is controlled by capacitor ratios is utili... | 09/01/1987 |
| 4581589 | Apparatus for avoiding clipping of amplifier A preclipping control technique is utilized to prevent the occurrence of clipping distortions evidenced in the output of an amplifier. Reference means provides an upper voltage level slightly lower than the upper saturation or clipping level of the amplif... | 04/08/1986 |
| 4570127 | Automatic gain control circuit for burst signal communication system An AGC circuit for amplifying burst signals has output power which does not vary, regardless of variations in the burst time. This automatic gain control (AGC) circuit has an amplifier for receiving a burst signal input and providing an amplified burst ou... | 02/11/1986 |
| 4495410 | Light receiving automatic gain control circuit Circuitry for optimizing the signal-to-noise ratio of a light receiving circuit having an avalanche photo diode to receive the light and an amplifier connected thereto to provide an output signal, the level of the output signal being kept constant despite... | 01/22/1985 |
| 4476437 | System for detecting abnormal condition of high frequency output signal in its power level A system for detecting an abnormal condition of a high frequency output signal in its power level, comprising: a variable gain power amplifier which receives a high frequency input signal and produces an amplified high frequency output signal; a negative ... | 10/09/1984 |
| 4398158 | Dynamic range expander A dynamic range expander which substantially limits the amount of positive expansion without affecting the amount of negative expansion is disclosed. In one arrangement, gain reduction in the amplitude of the output signal is increased when the amplitude ... | 08/09/1983 |
| 4393354 | Crossover circuit for use in automatic gain control systems A unity gain, closed loop, feedback amplifier is described which accurately defines the changeover point in an AGC system to provide a first output which varies in response to an AGC input signal and is indicative of the level thereof up to a predetermine... | 07/12/1983 |
| 4380737 | Fast AGC slew circuit A fast slew rate automatic gain control circuit (10) includes a variable gain amplifier (14) which is responsive to a gain control signal and an amplitude detector (18) which produces an amplitude signal corresponding to the amplitude of the received sign... | 04/19/1983 |
| 4376916 | Signal compression and expansion system An improved system for compressing or expanding the dynamic range of an electrical input signal of the type which includes a variable gain device for controlling the gain of the input signal and a circuit for generating a control signal for the variable g... | 03/15/1983 |
| 4307348 | Automatic gain control circuit An A.G.C. circuit is disclosed having two modulators connected in series to modulate an input signal and an amplifier for amplifying the output of the second modulator and applying it to an output terminal. A detector detects the output of the amplifier a... | 12/22/1981 |
| 4246543 | Delayed AGC circuit A delayed AGC circuit in which an AGC detection output is divided into two portions, one of them is applied through buffer means to an IF amplification stage to thereby control the gain thereof, and the other portion is applied to a tuner through a thresh... | 01/20/1981 |
| 4233566 | Distortion free power limiting and clipping prevention circuit A circuit for limiting the output power of a power amplifier to a preselected value in order to prevent the amplifier from either clipping the input signal or applying potentially damaging signal levels to a loudspeaker connected to the output of the ampl... | 11/11/1980 |
