Switching amplifier

Details Switching amplifier Switching amplifier

2007-05-29

2007-05-29

Nguyen, Patricia (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S251000, C330S20700P

Reexamination Certificate

active

11068107

ABSTRACT:
A switching amplifier including a PWM circuit14, a driver15, a switching output circuit16and an LPF17is provided with a fluctuation detection circuit12for detecting fluctuations in the power supply voltage. The fluctuation detection circuit12includes detection resistors122and123connected in series between a positive power supply19and a negative power supply20. A fluctuating signal RPL occurring at a fluctuation detection terminal121is supplied to the inverted input terminal of a differential amplifier131of a non-inverted amplifier circuit13. The non-inverted amplifier circuit13inverts the fluctuating signal RPL, mixes the inverted fluctuating signal into the input signal eS, amplifies the mixed signal, and supplying the amplified signal to the PWM circuit14.

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