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| Number | Title | Issue Date |
| 8169261 | High efficiency amplification A radio frequency amplification stage comprising: an amplifier for receiving an input signal to be amplified and a power supply voltage; and a power supply voltage stage for supplying said power supply voltage, comprising: means for providing a reference signal repr... | 05/01/2012 |
| 8026766 | Power circuits for power amplifiers and communication systems using the same A power circuit for a power amplifier which operates in an inactive period and an active period is provided and includes a power supply unit, a current limiting unit, a storage unit, and a converting unit. The power supply unit provides a first current. The current ... | 09/27/2011 |
| 7482869 | High efficiency amplification A radio frequency amplification stage including an amplifier for receiving an input signal to be amplified and a power supply voltage; and a power supply voltage stage for supplying said power supply voltage, including a circuit for providing a reference signal repr... | 01/27/2009 |
| 7395038 | High-efficiency modulating RF amplifier The present invention, generally speaking, provides for high-efficiency power control of a high-efficiency (e.g., hard-limiting or switch-mode) power amplifier in such a manner as to achieve a desired modulation. In one embodiment, the spread between a maximum frequ... | 07/01/2008 |
| 7158646 | Signal derived bias supply for electrostatic loudspeakers An electrostatic loudspeaker requires a high voltage DC bias power supply to bias the stators and diaphragms of electrostatic speakers. A self biased power supply eliminates the need for an external power supply by deriving a high voltage bias from the stator AC sig... | 01/02/2007 |
| 7136058 | Display apparatus, digital-to-analog conversion circuit and digital-to-analog conversion method A signal line drive circuit according to the present invention has: a latch circuit which latches digital pixel data; a D/A converter which converts a latch output from the latch circuit into an analog video signal; an AMP which amplifies the analog video signal con... | 11/14/2006 |
| 7099635 | High-efficiency modulating RF amplifier The present invention, generally speaking, provides for high-efficiency power control of a high-efficiency (e.g., hard-limiting or switch-mode) power amplifier in such a manner as to achieve a desired modulation. In one embodiment, the spread between a maximum frequ... | 08/29/2006 |
| 6970152 | Stacked amplifier arrangement for graphics displays A column driver for a graphics display has reduced power consumption by sharing power between upper and lower column amplifiers. The upper column amplifier operates over an upper supply range, while the lower column amplifier operates over a lower supply range. The ... | 11/29/2005 |
| 6917245 | Absolute power detector A method and apparatus is provided for detecting the output power of a power amplifier. The output power is detected by detecting the absolute values of the voltage and current at the output of the amplifier and mixing the detected voltage and current to generate a ... | 07/12/2005 |
| 6819226 | Systems and methods for energy storage in land-based telemetry applications The invention involves systems and methods of providing energy to land-based telemetry devices wherein the energy storage and power conditioning system is comprised of an input power supply, an energy storage element, an output supply and a control system. The input... | 11/16/2004 |
| 6756849 | Absolute power detector A method and apparatus is provided for detecting the output power of a power amplifier. The output power is detected by detecting the absolute values of the voltage and current at the output of the amplifier and mixing the detected voltage and current to generate a ... | 06/29/2004 |
| 6703080 | Method and apparatus for VHF plasma processing with load mismatch reliability and stability A radio frequency (RF) generator apparatus for a plasma processing system that is resistant to nonlinear load mismatch conditions is provided. The apparatus includes an RF oscillator configured to generate an RF signal, an RF amplifier responsive to the R... | 03/09/2004 |
| 6687490 | Transmission apparatus and method for a mobile communication terminal A transmission apparatus with reduced current consumption for a mobile terminal is disclosed. The transmission apparatus includes an automatic gain control (AGC) amplifier for AGC-amplifying an input baseband signal; an attenuator for attenuating an outpu... | 02/03/2004 |
| 6628791 | Signal derived bias supply for electrostatic loudspeakers An electrostatic loudspeaker requires a high voltage DC bias power supply to bias the stators and diaphragms of electrostatic speakers. A self biased power supply eliminates the need for an external power supply by deriving a high voltage bias from the st... | 09/30/2003 |
| 6587511 | Radio frequency transmitter and methods thereof In one embodiment, the present invention provides a radio frequency transmitter that may have a processor and a controller that reduce current consumption of the power amplifier of the radio frequency transmitter.... | 07/01/2003 |
| 6366177 | High-efficiency power modulators The present invention, generally speaking, incorporates the power amplifier as a fundamental constituent of a modulator, using polar modulation techniques. Thus, it is possible to achieve the combination of precision signal generation (including envelope ... | 04/02/2002 |
| 6256482 | Power- conserving drive-modulation method for envelope-elimination-and-restoration (EER) transmitters A method and a circuit for high-efficiency linear RF-power amplification over a wide range of amplitudes from zero to peak output includes a final RF-power amplifier operating at or near saturation, an RF driver amplifier, a high-level amplitude modulator... | 07/03/2001 |
| 6181796 | Method and system which drives left, right, and subwoofer transducers with multichannel amplifier having reduced power supply requirements A system and method which generates amplified signals indicative of left and right stereo channels, and uses the signals to drive transducers for each of subwoofer, left stereo, and right stereo channels. The amplification circuitry is operable with a pow... | 01/30/2001 |
| 4633190 | Voltage and current source fluctuation compensator and method A compensator for maintaining the amplification of one or more electronic signal amplifiers independent of fluctuations in the voltage and/or currents supplied to the amplifiers from voltage and/or current sources. A dummy amplifier is used which is subst... | 12/30/1986 |
| 4563660 | Noise isolation system for high-speed circuits A noise isolation circuit is provided that consists of a dual function bypass which confines high-speed switching noise to the component or circuit which generates it and isolates the component or circuit from high-frequency noise transients which may be ... | 01/07/1986 |
| 4511856 | Bootstrap power regulator for systems such as analog to digital converters A circuit for supplying regulated first and second supply voltages to the amplifier/comparator of a recirculation of remainder analog to digital converter, comprises a series pair of transistors connected as emitter followers between unregulated voltage s... | 04/16/1985 |
| 4210996 | Trimming method for resistance value of polycrystalline silicon resistors especially used as semiconductor integrated circuit resistors Current having a density higher than a critical value is passed through a polycrystalline resistor doped with impurities at a concentration higher than a critical value to decreasingly correct the initial value of the resistance, thereby trimming the resi... | 07/08/1980 |
| 4189680 | Isolated signal conditioner An isolated signal conditioning circuit is provided whereby control or measurement circuitry is isolated from a load, such as a control instrument, through the use of an optically coupled isolation amplifier. The control or measurement signal is condition... | 02/19/1980 |
| 4170761 | Remotely powered intermediate amplifier for communications transmission A remotely powered intermediate amplifier for communications transmission incorporates two sectional amplifiers and a filter circuit interconnecting the output of the first sectional amplifier with the input of the second sectional amplifier.... | 10/09/1979 |
| 4166983 | Circuit for limiting the output voltage of an amplifier A circuit permits the output voltage of an amplifier to be limited for certain ranges of its input voltage by causing the amplifier to saturate for said ranges of its input voltage by reducing the power supply. The invention is applicable, for example, to elim... | 09/04/1979 |
| 4158179 | Amplifier circuit An amplifier circuit having an input adapted to receive a signal to be amplified from a signal source, at least two sets of combined amplifying transistors and associated power sources for the amplifying transistors, the two sets constituting first and se... | 06/12/1979 |
| 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 |
| 4092608 | Electronic circuitry The present application relates to electronic circuitry for the improved handling of electric signals, particularly to the amplification thereof. The present application discloses an integral-amplifier that has a much higher efficiency than corresponding ... | 05/30/1978 |
| 4092609 | Circuit for reducing ripple voltage An imperfectly filtered d.c. operating voltage is applied to an electrode, such as the emitter electrode of an output transistor, an input signal being applied to another electrode, such as the base electrode of the transistor. The ripple component thereb... | 05/30/1978 |
| 4085381 | Amplifiers This invention relates to amplifiers for producing an accurate amplified version of a low voltage wave form. Specifically, the amplifier of the invention comprises independently fed first and second resistors connected to a common output which feeds a thi... | 04/18/1978 |
| 4066974 | Isolation amplifier There is disclosed an isolation amplifier having an input amplifier, an output amplifier, a transformer having primary and secondary windings, an alternator connected to the secondary winding of the transformer for alternately presenting a voltage and a h... | 01/03/1978 |
| 4063185 | Direct coupling type power amplifier circuit In a direct coupling type power amplifier circuit comprising an input differential amplifier stage, a drive amplifier stage responsive to the output signal of the input differential amplifier stage dc-wise and ac-wise, and a push-pull output amplifier sta... | 12/13/1977 |
| 4058776 | Bias circuit for avalanche diodes A bias circuit for a large pulse-width, broad-bandwidth radio-frequency avalanche device comprising a power supply coupled to the device through a bias line. The bias circuit includes a resistive network shunted across the bias line and ground to dampen s... | 11/15/1977 |
| 4031480 | Circuit arrangement for the ungrounded transmission of signals through testing points in communication systems A circuit arrangement for the ungrounded transmission of signals through testing points in communication systems with the aid of high-frequency oscillations. The high-frequency oscillations are controlled on the one side of the testing point and are recti... | 06/21/1977 |
| 3988690 | Amplifier circuit having a floating input stage An input amplifier stage is isolated from the main body of an amplifier and instrument ground by a single transformer which provides both an energy path to the input stage and an amplifier signal path from the input stage using a modulated load technique.... | 10/26/1976 |
