Switching amplifier

Amplifiers – Modulator-demodulator-type amplifier

Reexamination Certificate

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Details

C330S251000, C330S20700P

Reexamination Certificate

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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.

REFERENCES:
patent: 4255694 (1981-03-01), Morris et al.
patent: 4622480 (1986-11-01), Uchimura et al.
patent: 6232833 (2001-05-01), Pullen
patent: 6924700 (2005-08-01), Taura et al.
patent: 2006/0132231 (2006-06-01), Ishii et al.
patent: 56-152415 (1981-11-01), None
patent: 61-39708 (1986-02-01), None
patent: 02-125507 (1990-05-01), None
patent: 03-132206 (1991-06-01), None
patent: 03-159409 (1991-07-01), None
patent: 3394116 (1997-02-01), None
patent: 3338847 (1998-06-01), None
patent: 2002-151979 (2002-05-01), None
patent: 3338847 (2002-08-01), None
patent: 3394116 (2003-01-01), None
patent: 2004-172715 (2004-06-01), None
patent: 2004-180294 (2004-06-01), None

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