Amplifying circuit

Details Amplifying circuit Amplifying circuit

1991-08-29

1993-03-23

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330136, 330140, H03G 320

Patent

active

051968070

ABSTRACT:
An amplifying circuit with a small current consumption which is used for a portable radio, personal stereo systems or the like. The operating current of a differential amplifier, which is the main component of the amplifying circuit, is controlled by a first current circuit, which is a fixed constant-current source, and a second current circuit, which is a variable current source. The current of the second current circuit is controlled by an input audio signal with the voltage subjected to full-wave rectification. As a result, when the amplitude of the input signal is small, only a slight operating current is consumed by the first current circuit, thereby saving electricity. On the other hand, when the amplitude of an input audio signal is large, the current of the second current circuit also increases therewith, so that the amplifier flows a sufficiently large output current. Thus, it is possible to amplify the current in correspondence with the amplitude of an input signal, while reducing the operating current when the amplitude of an input signal is small, thereby reducing the current consumption.

REFERENCES:
patent: 3919654 (1975-11-01), Toumani
patent: 4077013 (1978-02-01), Morez et al.
patent: 4837523 (1989-06-01), Wright
patent: 4922208 (1990-05-01), Susak et al.
patent: 4935703 (1990-06-01), Poletto

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