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| Number | Title | Issue Date |
| 8183917 | RF power amplifier circuit with mismatch tolerance A radio frequency (RF) power amplifier system adjusts the supply voltage provided to a power amplifier (PA) adaptively, responsive to the measured or estimated power of the RF output signal of the PA. The RF PA system includes a power amplifier (PA) which receives a... | 05/22/2012 |
| 8093945 | Joint optimisation of supply and bias modulation A radio frequency amplifier system is disclosed in which the amplifier bias supply and power supply voltages are instantaneously modulated with signals derived from the envelope voltage of the input signal. Separate non-linear mapping functions are used to derive th... | 01/10/2012 |
| 8085089 | Method and system for polar modulation with discontinuous phase for RF transmitters with integrated amplitude shaping Aspects of a method and system for polar modulation with discontinuous phase for RF transmitters with integrated amplitude shaping may include amplifying a signal via a plurality of amplifiers such that a combined gain of the plurality of amplifiers comprises a coar... | 12/27/2011 |
| 7969241 | Gain control methods and systems in an amplifier assembly A Variable Gain Amplifier (VGA) amplifies an input signal according to a gain, to produce an amplified signal. A detector module detects a power indicative of a power of the amplified signal. A comparator module compares the detected power to a high threshold, a low... | 06/28/2011 |
| 7859334 | Hybrid power control for a power amplifier A hybrid power control system (102) that selectively applies voltage-based gain control and current-based gain control and method (300) of controlling a power amplifier (104) gain are presented. A voltage-based gain control signal (120) i... | 12/28/2010 |
| 7808312 | Broadband RF linear amplifier A broad-band linear amplifier circuit includes a driver amplifier to produce a first amplified radio frequency (RF) signal in a first single RF band in response to a first input RF signal and to produce a second amplified RF signal in a second single RF band in resp... | 10/05/2010 |
| 7795967 | AGC circuit There is provided an AGC circuit that has a very small offset voltage and is easy for integration, without using any of external capacities. For that reason, a variable gain amplifying circuit (GCA1) which has a gain controlled by a gain control signal, and w... | 09/14/2010 |
| 7795968 | Power ranging transmit RF power amplifier An RF PA operable in two or more selectable power ranges is disclosed. Switches configure the circuit for each range such that an amplifier device corresponding to the range provides final amplification, and all lower power amplifier devices also amplify the signal.... | 09/14/2010 |
| 7791412 | Gain control methods and systems in an amplifier assembly A Variable Gain Amplifier (VGA) amplifies an input signal according to a gain, to produce an amplified signal. A detector module detects a power indicative of a power of the amplified signal. A comparator module compares the detected power to a high threshold, a low... | 09/07/2010 |
| 7724086 | Apparatus and method for regulating the output power of an amplifier stage The present invention relates to a device and a method for regulating the output power of an amplifier stage, e.g. an amplifier stage in a mobile data transmission system. ... | 05/25/2010 |
| 7688136 | Shared linearity maintenance in power amplifiers In some embodiments, a circuit includes a power amplifier including an input terminal configured to receive an input signal and an output terminal to provide an RF voltage, the output terminal coupled to a load, a current sensor configured to sense the current drawn... | 03/30/2010 |
| 7675360 | Power control circuit and power control method A power control circuit includes: a fine adjustment variable amplifying unit configured to amplify the input signal in accordance with a first gain set value; a coarse adjustment variable amplifying unit configured to amplify the input signal in accordance with a se... | 03/09/2010 |
| 7557653 | Shared linearity maintenance in power amplifiers In some embodiments, a circuit includes a power amplifier including an input terminal configured to receive an input signal and an output terminal to provide an RF voltage, the output terminal coupled to a load, a current sensor configured to sense the current drawn... | 07/07/2009 |
| 7535297 | Architecture and method for improving efficiency of a class-A power amplifier by dynamically scaling biasing current thereof as well as synchronously compensating gain thereof in order to maintain overall constant gain of the class-A power amplifier at all biasing configurations thereof An architecture and method for improving efficiency of a Class-A power amplifier by dynamically scaling biasing current thereof as well as synchronously compensating gain thereof in order to maintain overall constant gain of the Class-A power amplifier at all biasin... | 05/19/2009 |
| 7501888 | Gain control methods and systems in an amplifier assembly A Variable Gain Amplifier (VGA) amplifies an input signal according to a gain, to produce an amplified signal. A detector module detects a power indicative of a power of the amplified signal. A comparator module compares the detected power to a high threshold, a low... | 03/10/2009 |
| 7463091 | Communication semiconductor integrated circuit device and wireless communication system The present invention provides a communication semiconductor integrated circuit device equipped with a high-frequency power amplifier circuit including a gain control amplifier and a bias circuit which supplies such a bias current as to linearly change the gain of t... | 12/09/2008 |
| 7446605 | Amplifier arrangement with controllable gain and method for controlling an amplifier gain An amplifier arrangement with controllable gain includes a first and a second amplifier device which each have a control input to receive a control signal to adjust a gain factor of the respective amplifier device. A control device is provided which is coupled to th... | 11/04/2008 |
| 7443236 | CDMA power amplifier design for low and high power modes An amplifier circuit responsive to a power mode signal improves efficiency at low power levels without compromising efficiency at high power levels. At low power levels, high impedance is presented with suitable adjustment in the phase of the signal. Also, providing... | 10/28/2008 |
| 7436334 | Amplifier, analogue to digital converter, methods of amplifying and of converting an analogue input signal to a digital output signal and of producing a mineral hydrocarbon fluid Amplifier comprising an input signal node for conveying an input signal having an input signal value and an output signal node for conveying an output signal having an output signal value. Amplifier circuitry is coupled to the input signal node and provided with a p... | 10/14/2008 |
| 7427894 | Dual-mode, dual-load high efficiency RF power amplifier A radio frequency (RF) amplifier has a driver device, an output device, and first and second impedance transformation networks. In a first operating mode the output device is turned on and the first impedance transformation network presents a first load impedance to... | 09/23/2008 |
| 7411456 | AGC circuit An AGC circuit includes: a variable gain amplifier circuit having a gain controlled with a gain control signal; a rectifier circuit for rectifying an output signal of the variable gain amplifier circuit; a voltage comparator for comparing a rectified signal with a t... | 08/12/2008 |
| 7382296 | System for mixed analog-digital automatic gain control Aspects of the invention provide a system for a mixed analog-digital automatic gain control. The received analog signal is amplified by the analog amplifier and then converted to a digital value by an ADC. A clamp reference level of the converted signal is removed p... | 06/03/2008 |
| 7382186 | Amplifiers with high efficiency in multiple power modes Described herein are representative embodiments of amplifiers having selectable power output while maintaining low power consumption. In certain exemplary embodiments, the amplifiers are operated as linear power amplifiers, such as may be used in wireless communicat... | 06/03/2008 |
| 7365597 | Switched capacitor amplifier with higher gain and improved closed-loop gain accuracy A switched capacitor CMOS amplifier uses a first stage non-inverting CMOS amplifier driving a second stage inverting CMOS amplifier. The first stage amplifier is provided with positive feedback to substantially increase the gain of the first stage amplifier. In the ... | 04/29/2008 |
| 7362172 | Variable gain circuit Low distortion is implemented even in a high input level, and a smooth change in gain is maintained. A first amplifier (10) with high gain and low noise that can be gain-controlled by a first gain control signal, and a second amplifier (20) with low ga... | 04/22/2008 |
| 7362178 | Wide dynamic range amplifier gain control Linear wide dynamic range variable gain amplifiers can be configured using a variable gain amplifier having an abbreviated gain control range in combination with a discrete attenuator controlled to select an attenuation from a predetermined set of attenuation values... | 04/22/2008 |
| 7358807 | Protection of output stage transistor of an RF power amplifier A protection method may prevent a load-mismatch-induced failure in solid-state power amplifiers. In an RF power amplifier, the load voltage standing-wave ratio results in very high voltage peaks at the collector of the final stage and may eventually lead to permanen... | 04/15/2008 |
| 7359453 | System and method for transitioning between modulation formats in adjacent bursts triggering on ramps A modulation system and method are provided for transitioning between modulation formats in adjacent transmit bursts. The modulation system includes a data interface, first modulation circuitry operating according to a first modulation format, and second modulation ... | 04/15/2008 |
| 7358923 | Enhanced magnetic field communication system Devices and methods are provided to enhance magnetic field communication. One aspect of the present subject matter relates to a method for transmitting and receiving signals using an antenna element electrically connected to a driver and an amplifier. According to v... | 04/15/2008 |
| 7356102 | Gain compensation over temperature and frequency variations in wireless transceivers Systems and methods are provided for controlling gain compensation over temperature and frequency variations. A variable amplifier may be used to receive a control signal and an input signal. The variable amplifier may be operable to apply a gain to the input signal... | 04/08/2008 |
| 7352237 | Radio frequency power amplifier and corresponding method A radio frequency power amplifier and corresponding methods are arranged and configured to drive or provide a radio frequency signal to a resonant load. The amplifier includes a radio frequency switching stage with an output that is coupled to a resonant circuit and... | 04/01/2008 |
| 7352244 | 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... | 04/01/2008 |
| 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 |
| 7348842 | Multi-substrate RF module for wireless communication devices A radio frequency (RF) module includes a first substrate adapted to receive passive circuits; and a second substrate adapted to receive active circuits, the first and second substrates electrically coupled through pads positioned on opposing surfaces of the first an... | 03/25/2008 |
| 7345536 | Amplifier circuit and control method thereof An amplifier circuit which is connected to a sensor and variably sets an amplification property and a control method thereof are disclosed, the circuit having the capability of restricting the influence of change with time and temperature change. The amplifier circu... | 03/18/2008 |
| 7342454 | Analog multistage amplification circuit in the field of sensor An analog multistage amplification circuit for keeping the total gain of analog amplifiers constant while automatically controlling gain of the amplifiers in accordance with an input signal level and improving the S/N ratio of the output signal. The amplification ci... | 03/11/2008 |
| 7343139 | Device for converting frequencies, method of calibrating said device and system for transmitting/receiving electromagnetic signals comprising such a device The invention relates to a device for converting frequencies comprising a local oscillator of fixed frequency and a first mixer with two inputs and an output, a first input receiving the signal to be converted and a second input receiving the signal arising from the... | 03/11/2008 |
| 7342445 | Radio frequency power amplifier circuit and method A method (200) and radio frequency amplifier circuit (100) for adjusting a gain setting of a power amplifier (102) and a gain setting of a power amplifier driver (106) that form part of the radio frequency amplifier circuit (100). ... | 03/11/2008 |
| 7342435 | Input stage resistant against negative voltage swings Apparatus (10) comprising a level shifter (15) connectable to a signal input (1) for receiving an input signal (s(t)) with a negative signal swing. The level shifter (15) provides for a DC shift of the input signal (s(t)) to provide an ou... | 03/11/2008 |
| 7340228 | Apparatus and method for high efficiency RF power amplification using drain bias adaptation An RF transmitter having an RF power amplifier comprising: 1) a drive transistor that receives an input RF signal and generates an output RF signal; and 2) a drain bias adaptation circuit for supplying drain current to the drive transistor. The drain bias adaptation... | 03/04/2008 |
