| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 330294000 | Having frequency-responsive means or phase-shift means in feedback path | 16 |
| 20080284521 | Electronic Signal Processor - An electronic signal processor for processing signals includes a complex first filter, one or more gain stages and a second filter. The first filter is characterized by a frequency response curve that includes multiple corner frequencies, with some corner frequencies being user selectable. The first filter also has at least two user-preset gain levels which may be alternately selected by a switch. Lower frequency signals are processed by the first filter with at least 12 db/octave slope, and preferably with 18 db/octave slope to minimize intermodulation distortion products by subsequent amplification in the gain stages. A second filter provides further filtering and amplitude control. The signal processor is particularly suited for processing audio frequency signals. Related methods include filtering the input signal with an input filter of the second or third order high pass type, amplifying the filtered signal and further filtering the amplified signal with a low pass filter, which may be of the second order type. | 11-20-2008 |
| 20100134190 | Programmable Compensation Network for Operational Amplifiers - Systems and methods for implementing a programmable network for a multimode conditionally stable operational amplifier are disclosed. | 06-03-2010 |
| 20100301946 | Switchable Multiband LNA Design - A low noise amplifying (LNA) circuit comprising an amplifying section ( | 12-02-2010 |
| 20110291764 | LINEAR FET FEEDBACK AMPLIFIER - A circuit that includes a Darlington transistor pair having an input transistor and an output transistor configured to generate an output signal at an output node in response to an input signal received through the input node is disclosed. The circuit has a frequency bias feedback network communicatively coupled between the output transistor and the input node for providing biasing to the Darlington transistor pair as well as for adjusting a phase and amplitude of an amplified version of the input signal that passes through the input transistor and into the frequency bias network. The circuit further includes a feedback coupling network coupled between the output node and the input node for feeding back to the input node a portion of the amplified version of the input signal that passes through the input transistor. | 12-01-2011 |
| 20120001694 | ADAPTIVE CARTESIAN LOOP TRANSMITTER FOR BROADBAND AND OPTIMAL LOOP STABILITY ADJUSTMENT - An integrated circuit includes a linearizer circuit in which excessive delay is compensated. The linearizer circuit includes a power amplifier, forward and feedback paths, and a microprocessor. A signal from the power amplifier is routed by the forward path to be transmitted while a portion of the signal to be transmitted is routed back to the power amplifier via the feedback path. The microprocessor applies phase training signals to the forward path. The microprocessor uses the phase training signals to determine the amount of delay in the linearizer circuit and alters the frequency position of poles and zeros in the linearizer circuit to compensate for the delay. The gain of the linearizer circuit is also altered by the microprocessor depending on the measured delay. | 01-05-2012 |
| 20130271221 | DIRECT CURRENT (DC)-DC CONVERTER HAVING A MULTI-STAGE OUTPUT FILTER - A direct current (DC)-DC converter that includes a first switching converter and a multi-stage filter is disclosed. The multi-stage filter includes at least a first inductance (L) capacitance (C) filter and a second LC filter coupled in series between the first switching converter and a DC-DC converter output. The first LC filter has a first LC time constant and the second LC filter has a second LC time constant, which is less than the first LC time constant. The first switching converter and the multi-stage filter form a feedback loop, which is used to regulate the first switching power supply output signal based on the setpoint. The first LC filter includes a first capacitive element having a first self-resonant frequency, which is about equal to a first notch frequency of the multi-stage filter. | 10-17-2013 |
| 20130300507 | POWER AMPLIFIER WITH FEEDBACK IMPEDANCE FOR STABLE OUTPUT - An amplifier circuit amplifies a signal for wireless transmission. A feedback circuit, including a capacitor, is coupled to the amplifier circuit. Components of the feedback circuit are selected based on a feedback factor such that an input impedance to the amplifier circuit has a same impedance characteristic as a feedback circuit impedance of the feedback circuit. | 11-14-2013 |
| 20140139292 | SYSTEM AND METHOD FOR POWER AMPLIFIER OVER-VOLTAGE PROTECTION - A system for power amplifier over-voltage protection includes a power amplifier configured to receive a system voltage, a bias circuit configured to provide a bias signal to the power amplifier, and a power amplifier over-voltage circuit configured to interrupt the bias signal when the system voltage exceeds a predetermined value, while the system voltage remains coupled to the power amplifier. | 05-22-2014 |
| 20140266459 | RF POWER AMPLIFIER WITH PM FEEDBACK LINEARIZATION - Circuitry, which includes a package interface, an RF amplification circuit, and a closed-loop phase linearization circuit, is disclosed. The package interface receives an RF signal and provides an amplified RF signal. The RF amplification circuit amplifies the RF signal to generate the amplified RF signal, such that an intermediate RF signal is generated during amplification of the RF signal. The closed-loop phase linearization circuit endogenously establishes a target phase of the amplified RF signal using the RF signal. Further, the closed-loop phase linearization circuit applies a phase-shift to the intermediate RF signal based on a difference between the target phase and a measured phase, which is representative of a phase of the amplified RF signal, wherein the phase-shift reduces phase distortion in the amplified RF signal. | 09-18-2014 |
| 20140320211 | DISTRIBUTED AMPLIFIER WITH IMPROVED STABILIZATION - A distributed amplifier with improved stabilization includes an input transmission circuit, an output transmission circuit, at least one cascade amplifier coupled between said input and output transmission circuits. Each cascade amplifier includes a common-gate configured transistor coupled to the output transmission circuit, and a common-source configured transistor coupled between the input transmission circuit and the common-gate configured transistor. The distributed amplifier also includes a non-parasitic resistance and capacitance coupled in series between a drain and a gate of at least one of the common-gate configured transistors for increasing the amplifier stability. | 10-30-2014 |
| 20140320212 | RADIO FREQUENCY POWER AMPLIFIERS - A radio frequency power amplifier amplifies an input signal at an input port, and produces an output signal at an output port. The power amplifier may include one or more amplifier stages. An amplifier stage may include an active device, and a feedback network. The feedback network may include one or more reactive elements configured to resonate at a predetermined frequency, to provide an impedance match at the input to the amplifier stage, and to provide an impedance match at the output of the amplifier stage. In some example implementations, the input and output impedance matching is caused by biasing the active device to produce a transconductance at least one of equal to or greater than a critical transconductance. | 10-30-2014 |
| 20140340156 | AMPLIFIER - An amplifier comprises a power amplifier for amplifying an unmodulated high-frequency input signal, a first branching device which is provided at an input terminal side of the power amplifier and extracts a signal, a second branching device which is provided at an output terminal side of the power amplifier and extracts a signal, a mixer for mixing a signal from the first branching device and a signal from the second branching device, a low-pass filter for removing a frequency band component of the input signal from an output signal of the mixer, a high-pass filter for removing a DC component from an output signal of the low-pass filter, and a wave detector for extracting a signal. | 11-20-2014 |
| 20150070093 | Logarithmic Detector Amplifier System for Use as High Sensitivity Selective Receiver Without Frequency Conversion - A logarithmic detector amplifying (LDA) system is provided for use as a high sensitivity receive booster or replacement for a low noise amplifier in a receive chain of a communication device. The LDA system includes an amplifying circuit configured to receive an input signal having a first frequency and generate an oscillation based on the input signal, a sampling circuit coupled to the amplifying circuit and configured to terminate the oscillation based on a predetermined threshold to periodically clamp and restart the oscillation to generate a series of pulses modulated by the oscillation and by the input signal, and one or more resonant circuits coupled with the amplifying circuit and configured to establish a frequency of operation and to generate an output signal having a second frequency, the second frequency being substantially the same as the first frequency. | 03-12-2015 |
| 20150349621 | DITHERING THE MAGNETIZATION OF A FERRITE LOAD - A driver for a ferrite load includes a controller, a clock generator, and a pulse generator. The driver includes a first driver element coupled to the pulse generator and configured to provide a first pulse with a first width that drives a current in a first direction through the load for setting a first magnetic flux. The driver includes a second driver element coupled to the pulse generator and configured to provide a second pulse, having a second width that is independent of the first width, that drives a current in a second, opposite direction through the load for setting a second magnetic flux. The driver includes a feedback input that is configured to receive at least one signal used by the controller to selectively cause the pulse generator to activate one of the first and second driver elements to apply a first or second pulse, respectively, to the load. | 12-03-2015 |
| 20160190989 | Optimization Methods for Amplifier with Variable Supply Power - Optimization methods via various circuital arrangements for amplifier with variable supply power are presented. In one embodiment, a switch can be controlled to include or exclude a feedback network in a feedback path to the amplifier to adjust a response of the amplifier dependent on a region of operation of the amplifier arrangement (e.g. linear region or compression region). | 06-30-2016 |
| 20180026591 | Logarithmic Detector Amplifier System for Use as High Sensitivity Selective Receiver Without Frequency Conversion | 01-25-2018 |
