Texas Instruments Corporation

Christian V Sorace

Paolo Giovanni Cusinato

Frederic Kubelec

Pierre Michel Carbou

Xavier Albinet

An amplifier () for voice or audio signals, and particularly for headset applications, uses a low gamplifier () for initially charging an output node (OUT) at the beginning of a power-on phase. After charging the output node, a main amplifier () is enabled to amplify the voice or audio signal. At power-down, a sample-and-hold circuit () drives an output transistor to discharge an AC coupling capacitor (). Thus, spikes at the output node are eliminated and an external filtering capacitor is not needed.

Amplifier with sample and hold output and low drive stage

Multi-stage amplifiers to reduce pop noise

An amplifier comprising an analog amplifier which outputs a first current and a second current. The amplifier also comprises a first digital amplifier coupled to the analog amplifier, the first digital amplifier amplifies a modified version of the first current to produce a third current. The amplifier also comprises a second digital amplifier coupled to the analog amplifier, the second digital amplifier amplifies a modified version of the second current to produce a fourth current. The amplifier also includes connections configured to provide the first, second, third and fourth currents through a load.

Growing community of inventors

Nice, France

Christian V Sorace