Switching amplifier comprising a delta-sigma modulation circuit

Details Switching amplifier comprising a delta-sigma modulation circuit Switching amplifier comprising a delta-sigma modulation circuit

2007-01-09

2007-01-09

Barnie, Rexford (Department: 2819)

Coded data generation or conversion

Analog to digital conversion followed by digital to analog...

C341S143000, C330S010000

Reexamination Certificate

active

11280390

ABSTRACT:
A switching amplifier is provided with a delta-sigma modulation circuit that performs delta-sigma modulation of an input signal that is either an analog signal or a multi-bit signal and outputs a quantized signal, a pulse amplifier that has a switching element and performs pulse amplification of the quantized signal by switching the switching element according to the quantized signal, an amplitude level detection circuit that detects the amplitude level of the input signal, and a sampling frequency adjuster that varies, according to the detection result of the amplitude level detection circuit, the sampling frequency of a quantizer included in the delta-sigma modulation circuit. The sampling frequency adjuster consists, for example, of a frequency division circuit and a multiplexer. With this configuration, it is possible to obtain a desired oscillation threshold and achieve higher electric power efficiency.

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