Intrinsix Corporation

Mucahit Kozak

Eugene Michael Petilli

Brian Kirk Jadus

An amplifier capable of driving an analog load is provided. The amplifier can be constructed and arranged to operate as at least one circuit selected from the group consisting of a class D amplifier, voltage regulator, audio amplifier, servo amplifier, servo control, digital control, switching power supply, and switching power amplifier. The amplifier comprises a sigma delta modulator (SDM), a pulse processing circuit, an output stage, and a feedback loop. The SDM produces a plurality of noise-shaped output pulses based upon an input signal (e.g., an analog input signal) to the amplifier and an error signal. The pulse processing circuit processes at least a portion of the plurality of noise-shaped output pulses to ensure that each of the noise-shaped output pulses in the portion contains an amount of energy that is as close as possible to the amount of energy in the other pulses. The output stage is coupled to the pulse processing circuit and has first state wherein the output stage provides analog noise-shaped output energy pulses to a load and a second state where the output energy delivered is essentially zero. The feedback loop is coupled between the output stage and the SDM. The feedback loop samples the energy provided to the load during the first state by measuring the load during the second state and generates an error signal based on the difference between the sampled portion of the noise-shaped output pulses and the input signal to the amplifier.

Sigma-delta based Class D audio or servo amplifier with load noise shaping

An amplifier capable of driving an analog load is provided. The amplifier comprises a sigma delta modulator (SDM), a pulse processing circuit, an output stage, and a feedback loop. The SDM produces a plurality of noise-shaped output pulses based upon a digital input signal to the amplifier and an error signal. The pulse processing circuit processes at least a portion of the plurality of noise-shaped output pulses to ensure that each of the noise-shaped output pulses in the portion contains an amount of energy that is as close as possible to the amount of energy in the other pulses. The output stage is coupled to the pulse processing circuit and has first state wherein the output stage provides analog noise-shaped output energy pulses to a load and a second state where the output energy delivered is essentially zero. The feedback loop is coupled between the output stage and the SDM. The feedback loop samples the energy provided to the load during the first state by measuring the load during the second state and generates an error signal based on the difference between the sampled portion of the noise-shaped output pulses and the input digital signal to the amplifier.

Sigma-delta based class D audio power amplifier with high power efficiency

A sigma delta modulator (SDM) data converter system is provided. The SDM data converter system comprises a signal path, a feedback signal path, and a multi-bit quantizer disposed in a feedforward path. The signal path receives an input signal to be processed. The feedback signal path provides a feedback signal that is subtracted from the input signal. The multi-bit quantizer is disposed in the feedforward path so as to receive the input signal after the feedback signal has been subtracted from it. Te multi-bit quantizer uses feedforward dynamic element matching (DEM) to spectrally shape mismatch errors in the SDM data conversion system and produce an output signal, wherein the output signal of the multi-bit quantizer is used for at least a portion of the feedback signal.

Mismatch-shaping dynamic element matching systems and methods for multi-bit sigma-delta data converters

A programmable Sigma-Delta Modulator (SDM) includes a first input to select an oversampling rate (OSR), which has a corresponding resonator coefficient value to provide an optimal notch in the Noise Transfer Function (NTF).

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Victor, NY, United States of America

Mucahit Kozak