Did You Know...
...that the Eveready Battery began as an invention called the "electric flowerpot," which was a tube with a battery and light bulb inside? The idea was to fasten this gizmo to the side of a flowerpot so it would illuminate the flowers from the bottom. The idea died on the vine and the businessman who licensed the flower pot, Conrad Huber, was left with a pile of useless tubes -- until he found a way to market them as batteries to light the world!
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| Number | Title | Issue Date |
| 8159295 | Supply-modulated RF power amplifier and RF amplification methods An embodiment of the invention is a method of generating a reduced bandwidth envelope signal VDD(t) for the power supply modulator of an RF amplifier. An envelope signal of an RF amplifier input Venv(t) is low pass filtered. The filtered envelo... | 04/17/2012 |
| 8154341 | Power amplifying apparatus A power amplifying apparatus includes a high-speed low pass filter which inputs an envelope signal included in a transmission signal therein, a low-speed low pass filter which inputs the envelope signal therein, a determination unit which inputs the envelope signal ... | 04/10/2012 |
| 8115547 | Reconfigurable power amplifier and use of such amplifier for making a multi-standard amplification stage for mobile phone communications A reconfigurable power amplifier includes at least one amplification circuit (E1, E2), and a circuit (6) for controlling the amplification circuit so as to adapt its operation according to an applied input signal (RFin). The circuit f... | 02/14/2012 |
| 8093948 | Power amplifier There is provided a power amplifier that can maintain a constant gain by detecting a level of a signal being input and a level of a signal being output. A power amplifier according to an aspect of the invention may include: an amplification section having at least o... | 01/10/2012 |
| 8093946 | Joint optimisation of supply and bias modulation There is disclosed a technique for controlling at least one amplification stage, comprising: selecting a linearity objective for the amplification stage; in dependence on an input signal to said amplification stage, determining a combination of supply input and bias... | 01/10/2012 |
| 8093947 | Power amplifier There is provided a power amplifier with a variable supply of bias power according to a look-up table having a voltage value determined based on a level of an RF signal being input to the power amplifier to thereby increase power efficiency. A power amplifier accord... | 01/10/2012 |
| 8089313 | Power amplifier An adaptive bias power amplifier including an amplifier, a signal coupler, a power detector and a bias control circuit is provided. The signal coupler is connected to an input terminal of the amplifier. The power detector is connected to the signal coupler, and dete... | 01/03/2012 |
| 8067981 | Method and system for extending dynamic range of an RF signal Aspects of a method and system for extending dynamic range of an RF signal are provided. In this regard, an amplitude signal that is representative of an amplitude of a pair of baseband signals may be generated, an amplitude of the generated amplitude signal may be ... | 11/29/2011 |
| 8022761 | Error driven RF power amplifier control with increased efficiency A power amplifier controller for adjusting a supply voltage to a power amplifier. The power amplifier controller adjusts the supply voltage so that distortion in an RF output signal corresponds to a predetermined limit. An amplitude error signal is generated by the ... | 09/20/2011 |
| 8018277 | RF power amplifier system with impedance modulation A power amplifier controller circuit controls an adjustable impedance matching network at the output of a power amplifier to vary its load line to improve the efficiency of the RF PA. The PA controller circuit comprises an amplitude control loop that determines an a... | 09/13/2011 |
| 8013674 | Amplifier compression adjustment circuit An RF power amplifier system adjusts the supply voltage to the power amplifier based upon an amplitude correction signal indicating the amplitude difference between the amplitude of the RF input signal and an attenuated amplitude of the RF output signal of the power... | 09/06/2011 |
| 8004357 | Method and apparatus for controlling high power amplifier in communication system An apparatus and method for controlling a high power amplifier in a communication system are provided. The apparatus includes a Radio Frequency (RF) power detection unit for detecting an intensity of an RF input signal, a high power amplifier controller for determin... | 08/23/2011 |
| 7994855 | Amplifier arrangement A gain-controlled RF amplifier system has an input node and an output node. The system has a plurality of amplifier devices, selectively connectable between the input node and the output node. The amplifier devices are placed in circuit according to a measured gain ... | 08/09/2011 |
| 7990214 | Power supply providing ultrafast modulation of output voltage A power supply for providing a modulated output voltage to a load is disclosed. According to various embodiments, the power supply comprises a plurality of parallel-connected switch-mode power modules and a controller. The controller is connected to each of the powe... | 08/02/2011 |
| 7986186 | Adaptive bias technique for field effect transistor A power amplifier includes a LDMOS transistor having a source, a drain, a control gate and a shielding electrode positioned between the control gate and the drain, and means for adaptively biasing the drain and shielding electrode power information for a RF signal. | 07/26/2011 |
| 7978008 | Supply voltage control device for amplifier A supply voltage control device for an amplifier that controls a supply voltage for the amplifier has been improved. The supply voltage control device includes: a supply voltage control circuit including an error amplification circuit that feeds an error current so ... | 07/12/2011 |
| 7965140 | Power amplifier A power amplifier is provided with an AD converter pulse modulating an envelope signal extracted from a high frequency modulation signal; a switching amplifier amplifying an output signal from the AD converter; a low-pass filter removing high frequency noise from an... | 06/21/2011 |
| 7956683 | High efficiency linear power amplifiers with load compensation The present invention addresses the problem to extend the dynamic power range where the amplifier operates linearly for a full input amplitude swing with improved efficiency. According to the present invention, the above presented problem is solved by changing the d... | 06/07/2011 |
| 7893763 | Apparatus and method for power added efficiency optimization of high amplification applications A power added efficiency optimizer apparatus is provided for measuring and monitoring input and output power of an amplifying device, and adjusting the load impedance seen by the amplifying device so that power added efficiency is maintained at optimum levels. A pow... | 02/22/2011 |
| 7859336 | Power supply providing ultrafast modulation of output voltage A circuit for use with a power amplifier that amplifies an input signal. The circuit may comprise an amplitude correction circuit and an open-loop switching regulator. The amplitude correction circuit may be configured to generate a corrected envelope signal from an... | 12/28/2010 |
| 7855599 | Power amplifier A power amplifier is provided with a signal generating circuit, a plurality of control signal amplifiers and an RF amplifier. The signal generating circuit outputs the amplitude modulation components of an input signal by dividing the components into a plurality of ... | 12/21/2010 |
| 7843262 | High efficiency power amplifier Disclosed a power amplifier including a main amplifier with class bias AB and a peak amplifier with class C bias. A quarter-wave length transmission line having a length equal to one-fourth of the wave-length of a fundamental frequency is connected to an output side... | 11/30/2010 |
| 7839213 | Amplifier architecture for polar modulation The present invention relates to an electronic device for power efficient linear amplification. The electronic device includes an amplifier (RF-PA) for amplifying a phase modulated signal (PM). The amplifier (RF-PA) is adapted to be controlled by a first modulating ... | 11/23/2010 |
| 7808313 | Power supply providing ultrafast modulation of output voltage A circuit for use with a power amplifier that amplifies an input signal. The circuit may comprise an amplitude correction circuit and an open-loop switching regulator. The amplitude correction circuit may be configured to generate a corrected envelope signal from an... | 10/05/2010 |
| 7795969 | Digital amplifier Recently, the use of class D audio amplifiers has become more and more widespread. In contrast to the generally employed class A-B linear amplification technology, class D allows for improved efficiency. However, the class D principle is known for its poor distortio... | 09/14/2010 |
| 7782134 | RF power amplifier system with impedance modulation A power amplifier controller circuit controls an adjustable impedance matching network at the output of a power amplifier to vary its load line to improve the efficiency of the RF PA. The PA controller circuit comprises an amplitude control loop that determines an a... | 08/24/2010 |
| 7777566 | Amplifier compression adjustment circuit An RF power amplifier system adjusts the supply voltage to the power amplifier based upon an amplitude correction signal indicating the amplitude difference between the amplitude of the RF input signal and an attenuated amplitude of the RF output signal of the power... | 08/17/2010 |
| 7768346 | System for amplifier linearization with envelope feedback An amplifier with linearization feedback includes an amplification stage that receives a feedback control signal from an envelope detection feedback network. The envelope detection feedback network controls the gain of the amplification stage based on an envelope of... | 08/03/2010 |
| 7741905 | Automatic gain control circuit An automatic gain control circuit includes a first voltage dividing resistor, a filter circuit, a switch circuit, and an amplifying circuit. The first voltage dividing resistor divides a voltage of the automatic gain control circuit using an internal impedance of th... | 06/22/2010 |
| 7733175 | Feed-forward automatic-gain control amplifier (FFAGCA) for biomedical applications and an associated method The present invention is a feed-forward automatic-gain control amplifier (FFAGCA) for biomedical applications and associated method, the FFAGCA comprises a detector, a controller, a variable gain amplifier (VGA), an input and an output. The associated method to proc... | 06/08/2010 |
| 7696821 | Method and system for extending dynamic range of an RF signal Aspects of a method and system for extending dynamic range of an RF signal are provided. In this regard, a signal representative of an amplitude of a pair of baseband signals may be generated. The amplitude of the generated signal may be expanded, and the amplitude ... | 04/13/2010 |
| 7649413 | High-frequency power amplifier improved in size and cost A high-frequency power amplifier of the present invention comprises a power supply unit for including a transistor for switching whose drain electrode—source electrode or collector electrode—emitter electrode are on/off controlled according to a pulse signal cor... | 01/19/2010 |
| 7602243 | Amplifier An object of the present invention is, in a high-frequency amplifier using a semiconductor device as an amplifying device, to achieve a high efficiency by controlling input/output matching circuits so that they are always optimized, when a bias voltage applied to th... | 10/13/2009 |
| 7567123 | Adaptive bias current circuit and method for amplifiers An adaptive bias method and circuits for amplifiers that provide a substantial current boost based at least partly upon a sensed input power of an amplifier circuit. Methods and circuits of the invention provide an additional bias current based upon the sensed input... | 07/28/2009 |
| 7560984 | Transmitter A transmitter according to the present invention is a transmitter conforming to the EER method, wherein a modulated signal is separated into phase and amplitude components, and the components are input to the high-frequency input terminal and the power supply voltag... | 07/14/2009 |
| 7554396 | Power amplifier circuit for peak envelope modulation of high frequency signal A power amplifier circuit for peak envelope modulation of a high frequency signal is provided. The power amplifier circuit includes a transformer which receives a first signal greater than a predetermined level of an envelope of a carrier signal to generate a transf... | 06/30/2009 |
| 7541867 | Polar amplifier An amplifier circuit receives a phase modulated signal at an input node. The power supply terminal of the amplifier circuit is modulated in accordance with an amplitude envelope signal. The voltage on the power supply terminal is modulated using one or more linear r... | 06/02/2009 |
| 7538610 | Method and system for enhancement of power amplifier efficiency through controlled variation of gain in a power Amplifier Driver Aspects of a method and system for enhancement of power amplifier (PA) efficiency through controlled variation of gain in a power amplifier driver are presented. Aspects of the system may comprise an envelope detector that enables detection of an amplitude of an ana... | 05/26/2009 |
| 7525377 | Method for controlling a linear power amplifier A linear power amplifier filters an instantaneous input signal to generate a filtered input signal, combines the instantaneous input signal and filtered input signal to generate a modified drain source voltage waveform and modulates a switched mode power supply to t... | 04/28/2009 |
| 7508262 | Envelope elimination and restoration amplifier harmonic energy recovery system and method A radio frequency (RF) amplifier system uses an envelope elimination and restoration (EER) amplifier having at least one carrier input, at least one power input, and at least one amplifier output carrying an amplified signal. The RF amplifier system disclosed also u... | 03/24/2009 |
