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| Number | Title | Issue Date |
| 7339426 | High efficiency linear amplifier employing dynamically controlled back off A high efficiency radio frequency (RF) power amplifier having dynamically controlled back off is disclosed. The RF input voltage is sampled by an adaptive analog signal processing circuit. The adaptive analog signal processing circuit controls the supply voltage to ... | 03/04/2008 |
| 7288754 | Optical receiver An optical receiver. The optical receiver includes a photodiode, a differential transimpedance amplifier, a transistor, and a current source. When the photodiode receives an optical signal, a current signal transmitted from a cathode of the photodiode to an anode th... | 10/30/2007 |
| 6011440 | Amplifier having output range that exceeds supply voltage Amplifier circuitry is provided having an output voltage range that exceeds its supply rail voltage. Such an amplifier may be useful in battery powered applications calling for driving a high impedance load with a low current, moderate bandwidth signal Th... | 01/04/2000 |
| 5909145 | Variable control of electronic power supplies Sag of a power signal delivered to of an amplifier is controlled. The maximum amount of sag is limited to limit crossover distortion. A measuring circuit monitors an observed signal to generate a measured signal. A sag control circuit receives the measure... | 06/01/1999 |
| 5892404 | Linear power amplifier with a pulse density modulated switching power supply A linear power amplifier having a pulse density modulated switching power supply including a power supply providing at least a relatively high DC voltage output; a voltage amplifier connected to an external signal source to amplify a relatively low voltag... | 04/06/1999 |
| 5751823 | Audio amplifier system with improved isolation between preamplifier and power amplifier An audio amplifier, particularly suited for automotive applications, providing improved isolation between the preamplifier section and the power amplifier section. The preamplifier section ground is isolated from the power amplifier section ground. The am... | 05/12/1998 |
| 5635872 | Variable control of electronic power supplies A regulated power supply control system with adjustable operating point and adjustable dynamic behavior for use with electronic power supply circuits, such as musical instrument amplifiers. The control system includes a measurement circuit (20) that gener... | 06/03/1997 |
| 5568088 | Waste energy control and management in power amplifier An amplifying apparatus for linearly amplifying a desired signal using a pair of coupled non-linear amplifiers is disclosed. The amplifying apparatus comprises a limiter for separating amplitude variations from the desired signal and producing a constant ... | 10/22/1996 |
| 5554959 | Linear power amplifier with a pulse density modulated switching power supply A linear power amplifier having a pulse density modulated switching power supply comprising: power supply means for connection to a source of electrical power and adapted to provide (i) a first, relatively high DC voltage, and (ii) a second, relatively lo... | 09/10/1996 |
| 5396194 | Audio frequency power amplifiers An audio frequency amplifier having a switching converter comprising source and sink rectifiers configured for sourcing and sinking current, in which the source and sink supply voltages of the rectifiers track the audio frequency signal being amplified. T... | 03/07/1995 |
| 5157353 | Audio system with transient tracking dual voltage power supply The present invention relates to electronic circuits, such as an operational amplifiers, which have dual power supply requirements. When the power supply voltages are switched between an "off" state and an "on" state, the power supply transient voltages o... | 10/20/1992 |
| 5091700 | Amplifier with mains voltage reduction A method enables a musician to reduce the voltage level between a nominal level which is supplied to power an audio power amplifier including at least one vacuum tube power output device and a reduced level, by controlling AC input voltage level of an AC ... | 02/25/1992 |
| 5036292 | Decoupled electrolytic capacitor A filter capacitor network includes an inductor connected in series with an aluminum electrolytic capacitor with the inductor and aluminum electrolytic capacitor bypassed with a capacitor having relatively better high frequency performance characteristics... | 07/30/1991 |
| 4819272 | Intermittently driven transmitter An intermittently driven transmitter having high power output which is driven intermittently so as to transmit a signal via, for example, a satellite in which the voltage supplied to the transmitter is boosted and supplied to a capacitor. When the signal ... | 04/04/1989 |
| 4742311 | Circuit arrangement with a load connected to the output of an amplifier especially for NMR A circuit in which a load connected to the output of an amplifier, and in particular for the gradient coil arrangement in a nuclear magnetic resonance tomography unit. To reduce the power loss in the amplifier, especially where, as in NMR tomography, high... | 05/03/1988 |
| 4719431 | Audio power amplifier A push-pull power amplifier includes a pair of input terminals, a pair of output terminals, a pair of matched output tubes having cathode, plate, and grid terminals, and a pair of output power supplies, all of which are connected to form a bridge circuit.... | 01/12/1988 |
| 4651112 | Audio amplifier system An audio amplifier system is provided including a transformer having a first primary winding that is center-tapped, a second primary winding and a secondary winding. The amplifier system includes a battery backup system by connecting a battery to the cent... | 03/17/1987 |
| 4636741 | Multi-level power amplifying circuitry for portable radio transceivers Unique multi-level power amplifying circuitry is described that may be advantageously utilized in duplex portable radio transceivers which may be inserted into a vehicular adaptor for operation from the vehicle battery. Upon detecting the presence of the ... | 01/13/1987 |
| 4535303 | Driver circuit In a driver circuit including at least one integrated circuit amplifier, adapted to be interconnected with a subscriber's line of a telephone system, the operating supply for the amplifier includes a pair of series connected voltage supplies having a maxi... | 08/13/1985 |
| 4449103 | High power class B modulation amplifier for a broadcast transmitter A method for amplifying electric signals, an amplifier circuit and application of this amplifier circuit as the modulator stage of a subsequent amplifier, employing a variable anode voltage for the purpose of improving the efficiency of amplifiers and par... | 05/15/1984 |
| 4442407 | Two loop automatic level control for power amplifier The power supply potential applied to the final stage of an RF amplifier is odulated by means of an adaptive power supply. The power supply potential applied to the final RF amplifier is controlled by a first control loop in accordance with an error signal... | 04/10/1984 |
| 4320350 | Sliding power supply for RF power amplifier A sliding power supply for a radio frequency power amplifier provides power to the power amplifier that is indirectly controlled by the load impedance voltage standing wave ratio of the amplifier. The overall results being an enhancement or improvement in... | 03/16/1982 |
| 4213099 | Hydrophone preamplifier and calibration circuit Calibration means, including an optiosolator, for a hydrophone preamplifier hich couples to a remote DC supply source and a remote load through a long, two-wire cable. The output signal of the optoisolator is fed to the amplifier in series with the hydroph... | 07/15/1980 |
| 4152661 | Modulation amplifier A modulation amplifier having an output amplifier element which contains an accumulation choke, a switching tube and a low-pass filter connected in series, with a commutation diode connected to the switching tube is disclosed. The switching tube is contro... | 05/01/1979 |
| 4117418 | Electric amplifier An electric amplifier useful for instance in simulators for strong electric signals, comprising several partial amplifiers so connected and voltage fed that they will amplify an interval each of the input voltage. Every partial amplifier comprises at leas... | 09/26/1978 |
| 4115739 | Power amplifier In order to eliminate distortion a power amplifier is biased to Class-A or Class-B operation and in order to minimize the power loss the supply voltage of a power source is decreased as much as possible and the power source is driven by another highly eff... | 09/19/1978 |
