Apparatus and method for a wide-band direct-coupled transistor a

Details Apparatus and method for a wide-band direct-coupled transistor a Apparatus and method for a wide-band direct-coupled transistor a

1987-07-20

1989-05-23

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330270, H03F 330

Patent

active

048334235

ABSTRACT:
In a wide-band direct-coupled transistor amplifier, the current through the power output stage must be stabilized to prevent fluctuations in the amplifier output signal. To stabilize the output stage current, a negative feedback loop is established providing a bias control for the amplifier input stage. In the past, voltage feedback apparatus, typically including operational amplifiers, has been utilized. In the present invention, a current feedback path, which avoids the voltage level translation inherent in the prior art, is used to provide the feedback bias control for the input stage of the amplifier. A technique for the compensation of temperature drift and for voltage offset is described.

REFERENCES:
patent: 4121168 (1978-10-01), Stitt
patent: 4356452 (1982-10-01), Iwamatsu
patent: 4358739 (1982-11-01), Nelson
patent: 4502020 (1985-02-01), Nelson et al.

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