Method and apparatus for controlling the operating point of an a

Details Method and apparatus for controlling the operating point of an a Method and apparatus for controlling the operating point of an a

1994-06-16

1996-02-27

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330270, 330290, 348707, 348805, H03F 330, H04N 500

Patent

active

054952140

ABSTRACT:
At high frequencies, a video amplifier draws a higher current and normally is biased to provide such current. However, since high frequencies are rarely encountered, the present circuit controls the operating point as a function of the frequency. More specifically, a controlled variable which controls the operating point of the amplifier stage is obtained in dependence on the frequency to which the amplifier stage is driven.

REFERENCES:
patent: 3529252 (1970-09-01), Long
patent: 4077013 (1978-02-01), Morez et al.
patent: 4468630 (1984-08-01), Marukawa et al.
patent: 4745464 (1988-05-01), Gronau et al.
patent: 5235288 (1993-08-01), Rinderle et al.
patent: 5282039 (1994-01-01), Villard
Philips Data Sheet--TDA3505/TDA3506, Nov. 1987.

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