Power amplifier apparatus

Details Power amplifier apparatus Power amplifier apparatus

1993-05-13

1994-08-30

Sikes, William L.

Amplifiers

Modulator-demodulator-type amplifier

330110, 330251, 330306, 330207A, H03F 3393, H03F 136, H03F 3217, H03F 2100

Patent

active

053431618

ABSTRACT:
A power amplifier apparatus having an operational amplifier which works as a PWM (pulse width modulation) amplifier as well as an analog amplifier according to an input signal level to miniaturize the size of the apparatus and to maintain amplifying function thereof at the changeover of the function, which allows gain and frequency characteristic of the operational amplifier to have continuity before and after the changeover. The power amplifier apparatus according to the present invention comprising: an operational amplifier having two input terminals, an input signal being inputted to one of the input terminals; a triangular waveform generator for outputting voltage with triangular waveform; an input signal level detecting circuit for applying the voltage with triangular waveform from the triangular waveform generator to the other input terminal of the operational amplifier; a broadband power amplifier for amplifying an output of the operational amplifier; and a low-pass filter connected to an output terminal of the broadband power amplifier.

REFERENCES:
patent: 4379240 (1983-04-01), Mammano
patent: 5077539 (1991-12-01), Howatt

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