Class / Patent application number | Description | Number of patent applications / Date published |
330103000 | Multiple feedback paths | 14 |
20080290937 | Constant gain amplifier system with positive and negative feedback - Constant and accurate signal gain systems based on controlling oscillator loop gain. A constant gain positive feedback network and an amplifier form an oscillator. Only when the oscillator loop gain is at least one does the oscillator produces an AC signal. Negative feedback of the oscillator's AC signal level is used to keep the loop gain close to or at the value of one by controlling the loop gain of the oscillator circuit. By maintaining the loop gain of the oscillator circuit substantially constant the signal gain is also maintained substantially constant. | 11-27-2008 |
20110068864 | Self oscillating class D amplification device - An amplification device, comprising a device input receiving a device input signal, an amplifier unit comprising a zero crossing detector unit, an output filter and a lead-lag compensation network. The zero crossing detector unit compares the device input signal with a reference potential and switches a pulse width modulated detector output signal between first and second voltage levels dependent on the comparison. The amplifier unit provides an actual device output signal, e.g., an amplified representation of the device input signal. The amplification device further comprises a device output providing the actual device output signal, a control loop bridging the amplifier unit and comprising a forward filter, e.g., an integrating filter, for increasing loop gain improving the signal-to-noise ratio of the actual device output signal, and a deviation detection unit detecting over modulation of the amplifier unit, so that the amplification device disables forward filter functioning upon over modulation. | 03-24-2011 |
20110163803 | Programmable Gain Amplifier and Embedded Filter - There is provided an integrated circuit having a programmable gain amplifier and an embedded filter. The programmable gain amplifier and the filter comprise a gain element having an inverting input for receiving an input and a feedback signal, a non-inverting input coupled to ground, and an output. The gain element also has one or more feedback loops coupling the output of the gain element to the inverting input of the gain element. Each feedback loop has a switch coupled in series with at least one passive component. Each switch has a first state to connect the corresponding feedback loop and a second state to disconnect the corresponding feedback loop. Each switch is programmatically configurable to provide a first gain and a first bandwidth and a second gain and a second bandwidth such that the first bandwidth is substantially equal to the second bandwidth. | 07-07-2011 |
20110193623 | Large Time Constant Steering Circuit and Instrumentation Amplifier Implementing Same - The present invention relates to a large time constant steering circuit for slowly changing a voltage on a node between at least two discrete voltage levels. The present invention further relates to a slow steering current DAC comprising said large time constant steering circuit. The present invention further relates to an instrumentation amplifier device comprising a current balancing instrumentation amplifier for amplifying an input signal to an amplified output signal and a DC servo-loop for removing a DC-component from the input signal. The present invention further relates to an EEG acquisition ASIC comprising said instrumentation amplifier device. | 08-11-2011 |
20120068765 | Method for Offset Compensation of a Switched-Capacitor Amplifier and Switched Capacitor Amplifier Arrangement - A method for offset compensation of a switched-capacitor amplifier comprises a reset phase (φ | 03-22-2012 |
20120139627 | METHOD FOR USING AN AMPLIFIER - An amplifier is provided that has a first loop interacting with a second loop. A feedback signal and input signal are provided to the amplifier. The first loop and the second loop interact with the input signal to nullify the feedback signal. | 06-07-2012 |
20140306754 | Feedback Control And Coherency Of Multiple Power Supplies In Radio Frequency Power Delivery Systems For Pulsed Mode Schemes In Thin Film Processing - A RF power supply system for delivering periodic RF power to a load. A power amplifier outputs a RF signal to the load. A sensor measures the RF signal provided to the load and outputs signals that vary in accordance with the RF signal. A first feedback loop enables control the RF signal based upon power determined in accordance with output from the sensor. A second feedback loop enables control the RF signal based upon energy measured in accordance with signals output from the sensor. Energy amplitude and duration provide control values for varying the RF signal. The control system and techniques are applicable to both pulsed RF power supplies and in various instances to continuous wave power supplies. | 10-16-2014 |
20150102858 | DISTRIBUTED POLE-ZERO COMPENSATION FOR AN AMPLIFIER - An amplifier includes an amplifier input and an amplifier output. A compensation network is coupled to the amplifier output. The compensation network includes at least one RC network tuned to a frequency in which the amplifier operates. The compensation network provides at least one zero to compensate for at least one pole introduced by a load coupled to the amplifier output. | 04-16-2015 |
330104000 | Positive and negative feedback | 6 |
20090322420 | Feedback Biasing Technique For A Stage Of An Amplifier That Uses A Feedback Control Loop Having Low Gain - According to an aspect of the present invention, a stage of an amplifier contains a positive feedback loop in addition to a negative feedback loop to maintain the bias currents at a desired level in the active components providing the output of the amplifier. The positive feedback loop senses the finite gain (i.e., less than the ideal infinite gain) of the negative feedback loop and compensates for the finite gain. Due to the use of the positive feedback, the duration and extent of deviation of the bias currents from the desired level is reduced, thereby minimizing the distortions in the output of the amplifier. In an embodiment, the stage corresponds to a class AB stage. | 12-31-2009 |
20110234312 | AMPLIFIER WITH IMPROVED STABILITY - A circuit includes an amplifier that defines a positive input terminal, a negative input terminal, a positive output terminal and a negative output terminal. The circuit also includes a first positive feedback path between the positive input terminal and the positive output terminal of the amplifier. Further, the circuit includes a second positive feedback path between the negative input terminal and the negative output terminal of the amplifier. The first positive feedback path and the second positive feedback path compensate the amplifier. | 09-29-2011 |
20120068766 | SAMPLE-AND-HOLD AMPLIFIER - A sample-and-hold amplifier ( | 03-22-2012 |
20120126889 | Low Distortion Variable Gain Amplifier (VGA) - In one embodiment, an apparatus an amplifier configured to receive an asymmetric signal. A first resistance is coupled between an input node and an output node of the amplifier, the input node receiving the asymmetric signal. A second resistance is coupled to the input node of the amplifier. The second resistance includes a linear resistor. A third resistance is coupled to the second resistance. The third resistance is varied to adjust an amount of asymmetric correction provided by the amplifier to correct the asymmetric signal at the output node. The amount of asymmetric correction is a function of the first resistance and a combination of the second resistance and the third resistance. | 05-24-2012 |
20120274399 | Pop-Up Noise Reduction in a Device - A device implementing a scheme for reduction of pop-up noise is disclosed. The device comprises an audio sub-system ( | 11-01-2012 |
20130147548 | LINEAR AMPLIFIER THAT PERFORM LEVEL SHIFT AND METHOD OF LEVEL SHIFTING - A linear amplifier that comprises a signal input terminal that receives an input signal having a first common mode voltage, a voltage amplifier having a non-inverting input terminal that receives a second common mode voltage, a first and a second input resistance connected in series from the signal input terminal to the inverting input terminal of the voltage amplifier, a feedback resistance connected between the inverting input terminal and the output terminal of the voltage amplifier, and a constant current source. The constant current source supplies a constant current to a middle node between the first and the second input resistances. The constant current generates a voltage drop, which is equal to a difference between the first and the second common mode voltages, across the first input resistance. Accordingly, the common mode voltage of the output signal is directly determined by the second common mode voltage. | 06-13-2013 |