Audio amplification device with antipop circuitry

Details Audio amplification device with antipop circuitry Audio amplification device with antipop circuitry

2007-06-05

2007-06-05

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S253000, C330S257000

Reexamination Certificate

active

11505626

ABSTRACT:
An audio amplification device includes an input for receiving an input audio signal and an output for delivering an output audio signal and an amplifier (OA1) comprising a differential pair of MOS transistors. The gate of the first transistor is coupled to the input of the device. The gate of the second MOS transistor receives a reference voltage which takes the form of a rising ramp when the power is turned on. The drain of one of the transistors is coupled to the output. The amplifier also includes a biasing circuitry for biasing the bulk of the transistors to a first voltage level approximately equal to a supply voltage at the beginning of the reference voltage ramp, and to a second voltage level (VBB) approximately equal to the voltage of their source at the end of the ramp. The generation of a pop is thus avoided when the power is turned on, while still benefiting from an optimum PSRR in the normal operation phase.

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patent: 2003/0067350 (2003-04-01), Goutti et al.
patent: 02/15388 (2002-02-01), None

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