Class 330/130 - Bias controlled by separate external control source

Subclass of Class 330 - Amplifiers
Definition: Subject matter wherein the "means to control the
No. of patents: 36
Last issue date: 06/10/2008

Number	Title	Issue Date
7386075	Apparatus for and method of optimizing the performance of a radio frequency receiver in the presence of interference An apparatus for and method of extending the dynamic range of a RF communications receiver. The invention provides a mechanism for controlling the gain of both the LNA and down conversion mixer in the front end portion of an RF receiver. Both the LNA and the mixer a...	06/10/2008
7355475	Output circuit of vacuum-tube amplifier An output circuit of a vacuum-tube amplifier is disclosed. An output circuit of a conventional vacuum-tube amplifier has shortcomings that a front end amplification unit uses a coupling condenser or a transformer to output an AC signal to an output node, a bias volt...	04/08/2008
7352240	Method and apparatus for protecting devices in an RF power amplifier A method and apparatus are provided for use with a power amplifier for protecting active devices on the power amplifier. A peak detector is used by control circuitry to detect the presence of a peak voltage that exceeds a threshold voltage. In response to the detect...	04/01/2008
7346318	High frequency power amplifier component and radio communication system In radio communication system that is able to transmit in two or more modulation modes, e.g., one modulation mode when phase shifts are performed and another modulation mode when phase shifts and amplitude shifts are performed, the disclosed invention can avoid that...	03/18/2008
7280839	Wireless communication device having gain error correcting feature It is an object of the present invention to suppress an abrupt gain change and smoothly and highly accurately control transmitted electric power even if the transmitted electric power greatly changes when a closed loop control that crosses the threshold value as the...	10/09/2007
7257381	Self-tuned millimeter wave RF transceiver module A self-tuned millimeter wave transceiver module includes a microwave monolithic integrated circuit (MMIC) having at least one amplifier. A controller is operatively connected to the MMIC for sensing amplifier operating conditions and tuning the at least one amplifie...	08/14/2007
7209718	Transmitter control circuit The invention relates to an arrangement and to a method for providing a linear transmitter amplifier (11; 50) that remains linear even when the load varies significantly over the passage of time. A detector circuit (14; 48) on the output of the amplifi...	04/24/2007
7193459	Power amplifier control technique for enhanced efficiency A power amplifier configuration including power amplifier circuitry and power control circuitry and having improved Power Added Efficiency (PAE) is provided. The power amplifier circuitry includes one or more input amplifier stages in series with a final amplifier s...	03/20/2007
7190935	Amplifier power detection circuitry The present invention provides an efficient way to detect the transmit power provided by an amplifier. A power sense signal indicative of the transmit power of the amplifier is generated and fed back to a control system, which will react accordingly to control input...	03/13/2007
7167045	System and method for modifying output power of an information communication system A system for communicating information includes a variable gain amplifier (VGA) responsive to an input signal and a gain control signal for controlling a gain of the VGA. The system also includes a power amplifier responsive to the VGA. An output power level of the ...	01/23/2007
7135921	Differential circuit, amplifier circuit, driver circuit and display device using those circuits A differential circuit and an amplifier circuit for reducing an amplitude difference deviation, performing a full-range drive, and consuming less power are disclosed. The circuit includes a first pair of p-type transistors and a second pair of n-type transistors. A ...	11/14/2006
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
7071776	Systems and methods for controlling output power in a communication device A mismatch detector including a directional device adapted to couple signals across the device and a detector coupled to a port on the directional device and configured to measure a reflected power a second detector coupled to a port on the directional device and co...	07/04/2006
7027789	Self-tuned millimeter wave RF transceiver module A self-tuned millimeter wave transceiver module includes a microwave monolithic integrated circuit (MMIC) having at least one amplifier. A controller is operatively connected to the MMIC for sensing amplifier operating conditions and tuning the at least one amplifie...	04/11/2006
6950636	Power amplifier control driver having over-current protection and linear control A linear power control loop for a power amplifier is disclosed. Embodiments of the invention linearly control the power amplifier output, prevent the power amplifier from failure induced by excessive supply current by reducing power amplifier bias current, and provi...	09/27/2005
6934520	CMOS current mode RF detector and method An integrated detector circuit (20) includes first and second gain stages (GS1, GS2). The first gain stage has an input (82) that monitors a high frequency signal (VRFDET) for routing a first detection current (IS1...	08/23/2005
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
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
6788123	Unity gain interpolator for delay locked loops A method and apparatus for delaying a clock signal involves a first clock path arranged to propagate a first clock signal; a second clock path arranged to propagate a second clock signal; and an interpolator arranged as a unity gain operational amplifier. An amount ...	09/07/2004
6597925	Transmitter circuit with frequency self-optimization In a transmitter circuit designed to operate over a specified transmit frequency range, information as to the specific frequency within the specified transmit frequency range at which the transmit up-converter of the transmitter circuit is to be operated,...	07/22/2003
6542029	Variable-slope variable-gain amplifier A system for varying output power of variable-gain amplifiers (VGA) allows for varying the output power transfer function, thus varying the gain, and, hence, the resolution of the output power of the VGA. The preferred embodiment comprises a variable-slop...	04/01/2003
6509722	Dynamic input stage biasing for low quiescent current amplifiers An amplifier, for use in regulator circuits and other applications, having dynamic input stage biasing includes an input stage operatively coupled to an input of the amplifier. A controlled current source coupled to the input stage is responsive to a cont...	01/21/2003
5987308	Portable terminal having a shared antenna with reduced standing wave ratio It is an object of the present invention to provide a portable terminal which reduces an antenna standing-wave ratio and absorbs reflected waves without inserting an isolator so that a stable operation can be obtained efficiently with a compact, low-price...	11/16/1999
5878331	Integrated circuit An integrated circuit includes a single pole double throw switch including a transmitting and receiving port, a transmitting port, and a receiving port. A transmission switch is coupled between the transmitting port and the transmitting and receiving port...	03/02/1999
5406225	Bias control circuit for radio-frequency power amplifier A bias control circuit for a radio-frequency power amplifier which performs linear power amplification of an intermittent radio-frequency signal. The control circuit includes a bias voltage setting circuit for supplying a bias voltage of a predetermined v...	04/11/1995
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
5327583	Using a clock signal generated by a microcomputer for providing a negative bias voltage to a galium arsenide field effect transistor in a high frequency amplifier of the device In a mobile radio communication device, a gain of a GaAs FET for high frequency power amplification is controlled by a negative voltage based on a clock signal generated by a microcomputer in the device....	07/05/1994
5229731	Power amplifying circuit capable of switching amplification mode The power amplifying circuit embodied by the invention is composed of a single-unit circuit capable of varying own bias condition, and yet, more than two kinds of amplifying modes can selectively be activated merely by applying a single-unit power amplify...	07/20/1993
5093667	T/R module with error correction A C-band transmit-receive module for an active aperture radar is provided employing gallium arsenide chips preferably manufactured by the Multifunction Self-Aligned Gate process and employing both open and closed loop error correction for both phase and a...	03/03/1992
4924191	Amplifier having digital bias control apparatus This amplifier is equipped with a digital bias control apparatus to provide precise, dynamic control over the operating point of a plurality of amplifying elements in the ampliifer. A processor optimizes the operating point of each individual amplifying e...	05/08/1990
4754231	Automatic control circuitry for a signal power amplifier The present invention is directed to an automatic power control circuit for a signal power amplifier which maintains the output power to one of a plurality of output power levels. The output power level is controlled by an externally-generally level contr...	06/28/1988
4644293	RF pulse modulated amplifier having conduction angle control A pulse modulated amplifier is described comprising a power transistor having a grounded base, an emitter for receiving a drive signal to be amplified, and a collector for emitting a high frequency pulse, the power transistor operating over a substantiall...	02/17/1987
4194164	Variable frequency sources An R.F. signal generator is arranged to provide an output signal having a controlled level, by means of a feedback loop into which an additional frequency dependent control signal is injected. This additional control signal is derived from a resistor netw...	03/18/1980
4189973	Electronic expression control An electronic organ in which a manually adjustable potentiometer varies the control voltage supplied to a voltage controlled amplifier interposed between a source of tone signals and an organ output circuit with the potentiometer being connected to the am...	02/26/1980
4047377	Sleep-inducing/interrupting audio system For sleep promotion and for sleeper awakening an audio system including a wide band audio frequency generator is provided with an output speaker, volume and tone selectors, a time-alarm signalling system, and means for connection with a house alarm system...	09/13/1977
3978421	Electrical musical instrument amplifier having improved tremolo circuit, improved reverberation control, and power reduction circuit for distortion mode operation An electrical musical instrument amplifier is disclosed in which a signal which has been provided by an instrument to a second one of two different preamplifiers for amplification therein is passed to one of the inputs of a summing amplifier together with...	08/31/1976

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Class 330/130 - Bias controlled by separate external control source