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| Number | Title | Issue Date |
| 7397303 | Vacuum tube circuit A vacuum tube circuit is capable of amplifying an input signal with use of a low source voltage. Ordinarily, the amount of electrons released from a cathode which is heated by a heater is small since a voltage supplied to the heater is low. In the vacuum tube circui... | 07/08/2008 |
| 7358711 | Adaptive control loop A digital controller for controlling a regulated output of an output regulator. The output regulator responsive to a pulse width signal for controlling the transfer of energy between an input source and the regulated output. The digital controller including a duty c... | 04/15/2008 |
| 7348841 | Multiple power mode amplifier with bias modulation option and without bypass switches A multiple power mode amplifier provides a low and a high power mode without using switches. This amplifier may be used in radio frequency (RF) applications such as mobile telephones, pagers, portable digital assistants, and wireless e-mail devices. In the low power... | 03/25/2008 |
| 7315205 | Multiple power mode amplifier with bias modulation option and without bypass switches A multiple power mode amplifier provides a low and a high power mode without using switches. This amplifier may be used in radio frequency (RF) applications such as mobile telephones, pagers, portable digital assistants, and wireless e-mail devices. In the low power... | 01/01/2008 |
| 7289775 | Method for transmit power control A transceiver has power control circuitry integrated therein. In particular, the power control circuitry receives a signal indicative of the transmit power level and adjusts the gain on a variable gain amplifier within the transceiver such that the output of the tra... | 10/30/2007 |
| 7274748 | AM to FM correction system for a polar modulator A transmitter for a mobile terminal including a polar modulator that compensates for amplitude to frequency distortion (AM to FM distortion) of a power amplifier in the transmit chain is provided. In general, the modulator includes a polar converter that converts an... | 09/25/2007 |
| 7253682 | Antenna amplifier The antenna amplifier for mobile FM radio reception includes a signal amplifier, a controllable adjusting element having a PIN diode for impedance adaptation, and a control amplifier for regulating the adjusting element. The antenna amplifier has a compensation for ... | 08/07/2007 |
| 7202734 | Electronically tuned power amplifier A circuit and method for electronically tuning an RF power amplifier. The output filter includes at least one electronically variable reactance. The electronically tuned power amplifier may be tuned rapidly to a selected frequency, to a selected impedance, or to pro... | 04/10/2007 |
| 7161422 | Multiple power mode amplifier with bias modulation option and without bypass switches A multiple power mode amplifier provides a low and a high power mode without using switches. This amplifier may be used in radio frequency (RF) applications such as mobile telephones, pagers, portable digital assistants, and wireless e-mail devices. In the low power... | 01/09/2007 |
| 7148747 | Apparatus for automatically controlling a gain of a power amplifier and associated methods An apparatus for automatically controlling a gain of a power amplifier includes a reception-signal detecting unit which detects a reception signal; a reference-voltage generating unit which generates a reference voltage; a gain control voltage detecting unit which c... | 12/12/2006 |
| 7057990 | Power control of laser diode in an optical recording/playback apparatus A method and apparatus for controlling the power of a laser diode, which can prevent fluctuation in the laser power of the laser diode at a record/playback area of an optical disc. The apparatus for controlling the power of the laser diode includes a controller whic... | 06/06/2006 |
| 7026665 | High voltage GaN-based transistor structure The present invention relates to a high voltage and high power gallium nitride (GaN) transistor structure. In general, the GaN transistor structure includes a sub-buffer layer that serves to prevent injection of electrons into a substrate during high voltage operati... | 04/11/2006 |
| 7023187 | Integrated circuit for generating a plurality of direct current (DC) output voltages A cascaded DC-DC converter architecture has an upstream converter stage and a downstream converter stage, which derives its input voltage from the upstream stage. Cascading the two converter stages enables functionality of control and monitoring (including soft star... | 04/04/2006 |
| 7023192 | Output regulator system and method An output regulator to convert an input voltage to a regulated output. The output regulator including a power stage to generate a power output from the input voltage. An output filter to filter the power output to generate the regulated output. An output sensor to g... | 04/04/2006 |
| 7019642 | Wide area multipurpose tracking system A method of electronically tracking and locating a very large number of objects such as, but not limited to, personal case files in health care, law, or human services systems is described. Each object to be tracked has an attached miniature radio transmitter called... | 03/28/2006 |
| 7002391 | Selectable input attenuation Mobile terminal design is made simpler by providing an attenuation circuit having a selectable amount of attenuation within an integrated circuit. In one embodiment, a plurality of input pins are provided so as to connect to different points of the attenuation circu... | 02/21/2006 |
| 6998919 | Temperature compensated power amplifier power control The present invention provides temperature compensation for a power amplifier by varying a supply voltage applied to the power amplifier. The supply voltage is varied based on operating temperature in light of the temperature characteristics of the power amplifier. ... | 02/14/2006 |
| 6979988 | Duty cycle estimation A duty cycle estimator for determining a nominal duty cycle of an output regulator. The duty cycle estimator having at least two modes and including at least a mode one estimator and a mode two estimator. The mode one estimator to determine the nominal duty cycle as... | 12/27/2005 |
| 6980039 | DC-DC converter with noise spreading to meet spectral mask requirements A DC—DC converter includes a variable frequency oscillator, a control system and a power train. The DC—DC converter is well suited for use in a cell phone. The control system uses the output of the oscillator to control the power train. The oscillator varies its... | 12/27/2005 |
| 6977492 | Output regulator A control system for controlling an output regulator having a regulated output. The control system including an output sensor to generate a digital sense signal to indicate within which of at least three reference ranges the regulated output is included. Each of the... | 12/20/2005 |
| 6977555 | Tuner circuit A tuner circuit includes a variable attenuator circuit including a PIN diode, disposed upstream of a variable-gain amplifier circuit and controlled according to the same AGC voltage used to control the variable-gain amplifier circuit. The operations of the variable-... | 12/20/2005 |
| 6970040 | Multi-mode/multi-band power amplifier The present invention provides a wideband power amplifier for a multi-mode or multi-band wireless communication device. The wideband power amplifier is configured to amplify signals in different frequency bands corresponding to different operating modes. In general,... | 11/29/2005 |
| 6969978 | DC-DC converter with reduced electromagnetic interference A DC-DC converter includes a variable frequency oscillator, a control system and a power train. The DC-DC converter is well suited for use in a cell phone. The control system uses the output of the oscillator to control the power train. The oscillator varies its fre... | 11/29/2005 |
| 6933711 | Voltage slicer and method A circuit for generating a feedback signal corresponding to a regulated output. The circuit including a reference generator to generate at least two reference levels, the reference levels to define at least three reference ranges. A comparator to compare the regulat... | 08/23/2005 |
| 6906584 | Switchable gain amplifier having a high-pass filter pole The present invention provides a switchable gain amplifier comprising a high-pass filter pole. The switchable gain amplifier comprises first and second input nodes for receiving first and second components of a differential input signal. A first input terminal of a ... | 06/14/2005 |
| 6903606 | DC offset correction using unused LNA A receiver performs DC offset correction by preliminarily using an unused LNA with a terminating resistance to determine a base level DC offset. Once the DC offset is determined, a DC offset correction may be calculated and applied to an active LNA output. When dete... | 06/07/2005 |
| 6801757 | Circuit configuration for matching an amplifier to a radio-frequency line, and use of the circuit configuration A circuit for matching an amplifier to a radio-frequency line is described. In order to minimize the number of components required for matching the amplifier to different frequency bands, the circuit has a first capacitance for outputting the negative half-cycle of ... | 10/05/2004 |
| 6724253 | Predistortion type linearizer controlled by two control voltages In a predistortion type linearizer including a FET, an input matching circuit connected to the drain of the FET for receiving an input signal, an output matching circuit connected to the source of said the FET for outputting an output signal, and a inductor having a... | 04/20/2004 |
| 6639469 | Variable-gain amplifier circuit There is disclosed a variable-gain amplifier circuit comprising an adjustable impedance circuit part including a bipolar transistor having a base connected to a control terminal for receiving a controlled bias voltage, a collector connected to a positive ... | 10/28/2003 |
| 6400222 | Linearizer A linearizer is provided which is capable of scaling its circuit down and making it lightweight, of lowering power consumption and of facilitating an input-output calibration. The linearizer is so configured that a first resistor is connected in series to... | 06/04/2002 |
| 6356150 | Portable integrated switching power amplifier A high efficiency multiple power level power amplifier has a PIN diode network that selectively associates an impedance transformation network with an interstage impedance matching network to maintain desired gain and linearity characteristics for the pow... | 03/12/2002 |
| 6255908 | Temperature compensated and digitally controlled amplitude and phase channel amplifier linearizer for multi-carrier amplification systems A linearizer channel amplifier for use in conjunction with a power amplifier comprises an input series circuit formed of a first variable attenuator, an input drive amplifier and a power limiter, and an output series circuit formed of a second variable at... | 07/03/2001 |
| 6215359 | Impedance matching for a dual band power amplifier An exciter matching circuit (125), interstage matching circuit (134), and harmonic filter matching circuit (140) match impedances at the input to a two-stage power amplifier (130), between the first stage (132) and the second stage (136) of the power ampl... | 04/10/2001 |
| 6075414 | High frequency amplifier having a variable attenuator connected to the base of an amplifier FET The invention provides a high frequency amplifier in which a variable attenuator consisting of a bypass FET, which has a drain connected to a first-stage amplifying FET via a resistor, and a source grounded via a capacitor, is located on a main signal lin... | 06/13/2000 |
| 6064256 | High frequency multi-stage capacitively coupled amplifier circuits A coupling capacitor 21 is connected in parallel to a diode 23 between an output nord N1 of a differential amplifier circuit 10 and an input nord N3 of another differential amplifier circuit 50. In a test mode, when a test signal TC is applied to a test p... | 05/16/2000 |
| 6020787 | Method and apparatus for amplifying a signal A unique method and apparatus modifies the load impedance at the output of a power amplifier by varying a voltage variable capacitor (VVC) (310) to maximize the efficiency of the power amplifier (304). A comparator (509) generates amplifier control signal... | 02/01/2000 |
| 5966051 | Low voltage medium power class C power amplifier with precise gain control A non-linear power amplifier for amplifying a constant envelope phase modulation component of a modulation signal and combining an amplitude envelope component of the modulation signal into the amplified constant envelope phase modulation component and me... | 10/12/1999 |
| 5742206 | Gain control circuit and variable gain power amplifier using same A gain control circuit (200) for controlling gain of a circuit (100) operative on the basis of a positive supply voltage, in accordance with strength of current pulled out by the gain control circuit from a control node (12) of the gain-controlled circuit... | 04/21/1998 |
| 5673001 | Method and apparatus for amplifying a signal A unique method and apparatus modifies the load impedance at the output of a power amplifier by varying a voltage variable capacitor (VVC) (310) to maximize the efficiency of the power amplifier (304). A comparator (509) generates amplifier control signal... | 09/30/1997 |
| 5668499 | Tube type power amplifier with distortion control A power amplifier has a distortion control circuit responsive to a clipping detector for loading said amplifier input with a signal sufficient to reduce the input to the tube grids to a level below clipping.... | 09/16/1997 |
