Cirrus Logic Inc.

Silicon Laboratories Inc.

Qi Cai

John L Melanson

Michael R May

Alessandro Piovaccari

Ramin Khoini-Poorfard

Peter Vancorenland

Frederick Rush

Anindya Bhattacharya

Bhoodev Kumar

Mitchell Reid

Alan F Hendrickson

David Paul Singleton

Morgan Timothy Prior

Pascal Blouin

Jonathan Timothy Wigner

David Le Goff

Chunyu Xin

Anuradha Parsi

Vivek Oppula

Henry William Singor

Christopher M Dougherty

Jean-Marc Guyot

Anindya Battacharya

Johnny Klarenbeek

Class D amplifier circuitry comprising: input buffer circuitry configured to receive a first digital input signal modulated according to a first modulation scheme in which the digital input signal can take a first plurality N of discrete signal levels; analog modulator circuitry configured to generate an analog modulated signal based on an analog output signal output by the input buffer circuitry; and quantizer circuitry configured to generate an output signal based on the analog modulated signal, wherein the output signal is modulated according to a second modulation scheme in which the output signal can take a second plurality M of discrete signal levels, wherein the second plurality M is greater than the first plurality N.

Class D amplifier circuitry

An apparatus for biasing a plurality of microphones includes a sensing circuit that actively senses a local ground reference for each microphone. An intermediate stage receives a constant non-local reference voltage as an input and responsively provides a respective constant local reference signal (e.g., current) with respect to each of the actively sensed local ground references. For each microphone, a respective microphone bias block uses the respective constant local reference signal to generate a respective constant local microphone bias voltage to bias the microphone. For each microphone, a variable RC network uses the respective constant local reference current to generate a constant local reference voltage for the microphone. Each RC network is controllable in response to the respective actively sensed local ground reference to independently set the respective local microphone bias voltage. A sensing circuit may actively sense the local microphone bias voltages to control local microphone bias voltage generation.

Microphone bias apparatus and method

An integrated circuit includes a tuner, a digital television (DTV) demodulator, an analog television (ATV) demodulator, and a controller. The tuner includes an input for receiving a radio frequency (RF) signal including at least one of an analog television signal and digital television signal, and including a first output terminal and a second output terminal. The DTV demodulator includes a DTV input coupled to the first output terminal of the tuner and includes a DTV output terminal. The ATV demodulator includes an ATV input coupled to the second output terminal of the tuner and includes an ATV output terminal. The controller is coupled to the tuner, the DTV demodulator, and the ATV demodulator to configure the tuner and at least one of the DTV demodulator and the ATV demodulator for receiving television content in a selected television format.

Receiver and method of receiving analog and digital television signals

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Austin, TX, United States of America

Qi Cai