Quotables
"Transmission of documents via telephone wires is possible in principle, but the apparatus required is so expensive that it will never become a practical proposition."
Dennis Gabor, British physicist
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 8188793 | Systems and methods for saturation detection and corection in a power control loop Systems and methods are described for detecting and correcting saturation in a power amplification circuit. An exemplary circuit comprises a power amplifier that provides an amplified output signal based upon an input signal and a gain control signal; a power detect... | 05/29/2012 |
| 8188794 | Method and system for providing automatic gate bias for field effect transistors The present invention provides a feedback gate bias circuit for use in radio frequency amplifiers to more effectively control operation of LDFET, GaNFET, GaAsFET, and JFET type transistors used in such circuits. The invention provides a transistor gate bias circuit ... | 05/29/2012 |
| 8183925 | High frequency power amplifier and operating method thereof A high-frequency power amplifier which can reduce a variation of power gain due to the dependence on gate length of a power amplification field effect transistor is provided. The high-frequency power amplifier comprises, over a semiconductor chip, a bias control cir... | 05/22/2012 |
| 8179198 | Variable gain amplifier having automatic power consumption optimization A variable gain amplifier may include a master amplifier that may be configured to generate a first current and a diode coupled with the master amplifier so that the first current passes through the diode which, when the first current is passing through the diode, g... | 05/15/2012 |
| 8076974 | Radio frequency (RF) power amplifier and RF power amplifier apparatus An RF power amplifier has a final-stage amplifier stage which generates an RF transmit output signal, a signal detector which detects an RF transmit output level, a first detector, a second detector and a control circuit. The final-stage amplifier stage includes a t... | 12/13/2011 |
| 8067984 | Variable gain circuit There is provided a variable gain circuit system which is inductorless and capable of achieving a high gain and a wide band by elements for achieving variable gain to prevent decreasing a gain or deteriorating the band. The variable gain circuit includes: transistor... | 11/29/2011 |
| 8040186 | Radio frequency amplifier circuit and mobile communication terminal using the same A bias circuit 12 includes: a transistor Q5 operable to supply, to an amplifier 11, a bias current in accordance with a base current supplied thereto; a transistor Q3 operable to pass a current in accordance with a reference voltage Vref;... | 10/18/2011 |
| 8022765 | Source follower with gain compensation, and circuits and methods for source follower gain error compensation Circuits and methods for compensating for an input-dependent gain error in a buffer and/or amplifier circuit, including applying a dynamic current to the input transistor. Circuits generally include a dynamic current supply coupled to a terminal of the input transis... | 09/20/2011 |
| 8022766 | CMOS power amplifiers having integrated one-time programmable (OTP) memories CMOS power amplifiers (PAs) are disclosed having one or more integrated one-time programming (OTP) memories that are utilized to control at least in part operation of the CMOS PAs. The integrated OTP memories within the CMOS power amplifiers (PAs) allow adjustments,... | 09/20/2011 |
| 8008974 | Power amplifier system with power control function A power amplifier system with power control function provides accurate and efficient power control by controlling a bias voltage and a bias current of the power amplifier at the same time. A power amplifier system with power control function according to an aspect o... | 08/30/2011 |
| 7994860 | Electronic component for high frequency power amplification An electronic component for high frequency power amplification realizes an improvement in switching spectrum characteristics. The gain of an amplifying NMOS transistor is controlled by a bias voltage on which a bias control voltage is reflected. Further, a threshold... | 08/09/2011 |
| 7990221 | Detector circuit and system for a wireless communication Provided are a detector circuit which has a simple circuit configuration, is capable of indicating an accurate power according to a load fluctuation of a radio frequency power amplifier or a difference in a modulation mode, and can be easily incorporated in the radi... | 08/02/2011 |
| 7948318 | Amplifying circuit, AC signal amplifying circuit and input bias adjusting method An amplifying circuit includes: an amplifying unit which amplifies an input signal and applies the amplified signal to a designated load; a current detection unit which detects a load current that flows into the designated load upon application of the amplified sign... | 05/24/2011 |
| 7944306 | Dual bias control circuit The present invention relates to a bias control circuit and method for supplying a bias signal to at least one stage of an amplifier circuit, wherein a dual bias control is provided by generating a bias current and additionally using this bias current to derive a co... | 05/17/2011 |
| 7907014 | System and method for dynamic drain voltage adjustment to control linearity, output power, and efficiency in RF power amplifiers A system and method for dynamic adjustment of drain or collector voltage of a power amplifier (PA), including a PA having a voltage input, a temperature sensor measuring ambient temperature of the PA, and an adaptive PA control processor that dynamically changes the... | 03/15/2011 |
| 7898335 | Amplifier circuit There is provided an amplifier circuit includes: an amplifying transistor; a first transistor having a DC current amplification factor generally equal to the DC current amplification factor of the amplifying transistor and constituting a current mirror circuit in co... | 03/01/2011 |
| 7893769 | Power amplifier, method for controlling power amplifier, and wireless communication apparatus A power amplifier includes: a distortion compensating circuit that causes a bias circuit to have an output impedance so that a subsequent block bipolar transistor for signal amplification-use has a maximized saturated output power; and a distortion compensating circ... | 02/22/2011 |
| 7876156 | Radio frequency (RF) power amplifier and RF power amplifier apparatus An RF power amplifier has a final-stage amplifier stage which generates an RF transmit output signal, a signal detector which detects an RF transmit output level, a first detector, a second detector and a control circuit. The final-stage amplifier stage includes a t... | 01/25/2011 |
| 7876157 | Power amplifier bias circuit having controllable current profile A power amplifier bias circuit having a controllable current profile includes a first transistor device configured as a switch, and configured to receive a non-regulated system voltage, and a plurality of resistors configured to provide a current and configured to d... | 01/25/2011 |
| 7868696 | Method and system for a highly efficient power amplifier utilizing dynamic baising and predistortion Aspects of a method and system for a highly efficient power amplifier (PA) utilizing dynamic biasing and predistortion are presented. Aspects of the system may include a processor that enables computation of a value of a variable bias component of a bias current bas... | 01/11/2011 |
| 7863984 | High efficiency microwave amplifier Disclosed is an apparatus and method for operating a microwave amplifier with improved efficiency and reduced harmonic emissions. The disclosed amplifier includes a variable rail voltage supply and a variable input drive stage. A controller continually monitors the ... | 01/04/2011 |
| 7863983 | Smart linearized power amplifier and related systems and methods A power amplifier subsystem that includes a first stage amplifier and a second stage amplifier. A first bias circuit is coupled to the first stage amplifier, and the first bias circuit has a variable impedance that increases with radio frequency (RF) power. A second... | 01/04/2011 |
| 7855601 | Semiconductor device A semiconductor device including: a gain control circuit; a first circuit which is controlled a gain to be constant by the gain control circuit; and a bias circuit connected to the first circuit, wherein the first circuit including a first transistor; and a load res... | 12/21/2010 |
| 7843267 | Operational-based compensation of a power amplifier A method for compensating a power amplifier based on operational-based changes begins by measuring one of a plurality of operational parameters of the power amplifier to produce a measured operational parameter. The method continues by comparing the measured operati... | 11/30/2010 |
| 7825730 | Bias circuit for the wireless transceiver A bias circuit for the wireless transceiver is disclosed, which can be used for modulating the gain of the amplifier. The bias circuit comprises a first stage bias unit for receiving a constant current, a control voltage, and a first reference voltage and outputting... | 11/02/2010 |
| 7786805 | Power amplifier module and a time division multiple access radio A power amplifier module comprises a power amplifier circuit having an output power level controlled by a power supply voltage. A power supply transistor controls the power supply to the power amplifier circuit from a drive signal which is received from a drive circ... | 08/31/2010 |
| 7768353 | Systems and methods for switching mode power amplifier control Embodiments of the invention may provide for enhancement systems and methods for a power amplifier output control system. In an example embodiment, driver amplifier control may be provided in conjunction with power amplifier control to improve the power efficiency a... | 08/03/2010 |
| 7741912 | Varying amplifier bias parameters to meet radio frequency (RF) communications requirements The present invention relates to amplifier bias circuitry, which provides a direct current (DC) bias to a radio frequency (RF) amplifier. The amplifier bias circuitry includes a control loop having a control loop bandwidth, and an output impedance associated with pr... | 06/22/2010 |
| 7679449 | Method and system for a highly efficient power amplifier utilizing dynamic biasing and predistortion Aspects of a method and system for a highly efficient power amplifier (PA) utilizing dynamic biasing and predistortion are presented. Aspects of the system may include a processor that enables computation of a value of a variable bias component of a bias current bas... | 03/16/2010 |
| 7679448 | Continuous wave based bias method and apparatus for minimizing MOS transistor distortion A biasing circuit and method for minimizing distortion in a MOS transistor. A first CW source provides a first CW signal at the input of a replica transistor to obtain an output signal at the output of the replica transistor. The output signal is mixed with another ... | 03/16/2010 |
| 7639080 | Radio frequency amplifier circuit and mobile communication terminal using the same A bias circuit 12 includes: a transistor Q5 operable to supply, to an amplifier 11, a bias current in accordance with a base current supplied thereto; a transistor Q3 operable to pass a current in accordance with a reference voltage Vref;... | 12/29/2009 |
| 7629850 | Variable-gain image-reject low-noise amplifier A variable-gain amplifier includes an intermediate node operative to receive an electric current from a current source. A common-emitter amplifier has a collector electrically connected to the intermediate node. A first common-base amplifier has an emitter electrica... | 12/08/2009 |
| 7629851 | High frequency power amplifier circuit and electronic component for high frequency power amplifier In a high frequency power amplifier circuit that supplies a bias to an amplifying FET by a current mirror method, scattering of a threshold voltage Vth due to the scattering of the channel impurity concentration of the FET, and a shift of a bias point caused by the ... | 12/08/2009 |
| 7622992 | Power amplifier circuit having a bias signal inputted into input terminal and method thereof The present invention discloses an adjustable gain power amplifier circuit. The adjustable gain power amplifier circuit includes a power amplifying unit for receiving and amplifying an input signal to generate an output signal; a power detecting unit for detecting p... | 11/24/2009 |
| 7612611 | Amplifier circuit An amplifier circuit for amplifying a high-frequency input signal comprises an amplifier stage, which amplifies the high-frequency input signal as a function of an operating point of the amplifier stage and generates an operating point-dependent signal, an observer ... | 11/03/2009 |
| 7595694 | Electronics parts for high frequency power amplifier This invention provides an electronic part for high frequency power amplification (RF power module) which will automatically perform the precharge level setting for proper output power at start of transmission without requiring the software process for precharging t... | 09/29/2009 |
| 7567126 | Variable gain amplifier and control method thereof A variable gain amplifier has a first amplifier circuit (106) having a first field-effect transistor and amplifying a signal input to a gate of the first field-effect transistor to output; a gate bias control circuit (102) controlling a gate bias of th... | 07/28/2009 |
| 7564311 | Method and apparatus to enhance linearity and efficiency in an RF power amplifier Dynamic biasing techniques are used to enhance both linearity and efficiency within a transistor power amplifier. In at least one embodiment, as the power level being processed by a transistor increases toward a saturation point, a transistor is moved from class B o... | 07/21/2009 |
| 7560990 | Low noise amplifier and low noise amplifying method A low noise amplifier for operating in response to different gain modes is disclosed. The low noise amplifier includes a voltage adjusting circuit, which provides a first bias voltage at a first gain mode and provides a second bias voltage at a second gain mode, whe... | 07/14/2009 |
| 7551032 | Method and apparatus for controlling the output power of a power amplifier A method and apparatus is provided for use with a power amplifier to provide a regulated supply to the power amplifier. The invention uses a combination of voltage and current regulation to overcome the problems encountered in the prior art. In one example, voltage ... | 06/23/2009 |
