| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 330107000 | Phase shift means in loop path | 7 |
| 20090167433 | AUDIO APPARATUS - An audio apparatus includes an input, a first resistor, a first capacitor, an amplifier, a second resistor, a second capacitor, and an output. The input is used for inputting audio signals. The first resistor and the amplifier are serially connected to the input; wherein the first resistor is connected to the inverting input of the amplifier and the non-inverting input of the amplifier is connected to ground. The first capacitor has one end connected to a node between the first resistor and the inverting input of the amplifier, the other end connected to ground. The second resistor has one end connected to a node between the first resistor and the inverting input of the amplifier, the other end connected to the output of the amplifier. The second capacitor is connected between the inverting input and the output of the amplifier. The output is connected to the output of the amplifier, for outputting the audio signals after processing. | 07-02-2009 |
| 20100060353 | Power amplifier linearization using RF feedback - The power amplifier mainly includes a main amplifier, two splitters, one combiner, one subtracter, two phase shifters, one attenuator and one error amplifier. The splitters, subtracter and combiner are designed in the form of 90-degree or quadrature hybrid couplers. A quadrature hybrid can be implemented with any lumped or transmission-line elements and has an important advantage compared to the in-phase splitter that at equal values of reflection coefficients from loads connected to the in phase and 90° phase shift terminals, the reflection wave is lacking at the main input terminal and, consequently, the input voltage standing wave ratio of a quadrature hybrid does not depend on the equal load mismatch level. | 03-11-2010 |
| 20110260790 | DUAL TIME ALIGNMENT ARCHITECTURE FOR TRANSMITTERS USING EER/ET AMPLIFIERS AND OTHERS - An apparatus and method linearize a power amplifier in a transmitter by using a dual time alignment scheme. A first adjustable time delay unit delays a modulator signal input of a power amplifier. A first time delay estimator estimates a time delay between the delayed feedback signal and the reference signal, and adjusts the first adjustable time delay unit based on the estimated time delay between the delayed feedback signal and the reference signal. A second adjustable time delay unit delays the feedback signal. And a second time delay estimator estimates the time delay between the delayed feedback signal and the reference signal, and adjusts the second adjustable time delay unit based on the estimated time delay between the delayed feedback signal and the reference signal. | 10-27-2011 |
| 20110298536 | DISTORTION COMPENSATION AMPLIFIER - To accelerate the convergence of distortion compensation and improve the performance of distortion compensation in a distortion compensation amplifier which performs distortion compensation with a pre-distortion scheme. | 12-08-2011 |
| 20130093510 | HIGH-FREQUENCY SIGNAL AMPLIFIER - A high-frequency signal amplifier includes an amplifier having an input terminal and an output terminal, and amplifying a high-frequency signal; a signal line connected between the output terminal of the amplifier and an antenna; coupled lines arranged in parallel and coupled to the signal line and having different line lengths or differently terminated ends; and phase shifters shifting phase of high-frequency signals applied via the signal line and the coupled lines, supplying the high-frequency signals to the input terminal of the amplifier, and having different amounts of phase change. | 04-18-2013 |
| 20150028945 | Methods and Devices for Improving Power Amplifier Efficiency - Devices and methods to reduce adjacent channel power of an amplifier are described. The adjacent channel power can be reduced by considering the third harmonic output from the amplifier, and minimizing such third harmonic amplitude by implementing a phase shifter feedback circuit to the amplifier. The phase shifter feedback circuit can shift the phase of the feedback signal in order to reduce the third harmonic amplitude, which in turn reduces the adjacent channel power. | 01-29-2015 |
| 20150333701 | Phase-Modulated Load Apparatus and Method - Methods and apparatus are provided to improve the efficiency of an outphasing amplifier through modulating the phase angle of a reflected signal in the outphasing amplifier. An outphasing amplifier includes a first amplifier and a second amplifier. A circulator is provided having a first port coupled to an output of the outphasing amplifier, a second port coupled to a load and a third port coupled to a phase shifter. The phase shifter is configured to provide a different phase angle of a reflected signal from the phase shifter to the outphasing amplifier through the circulator. | 11-19-2015 |
