Inductorless voltage biasing circuit for and Ac-coupled amplifie

Details Inductorless voltage biasing circuit for and Ac-coupled amplifie Inductorless voltage biasing circuit for and Ac-coupled amplifie

1996-07-30

1998-06-02

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including particular biasing arrangement

330290, H03F 130

Patent

active

057606510

ABSTRACT:
An inductorless voltage biasing circuit is provided for an AC-coupled amplifier of the type having a signal input terminal and a coupling capacitor for coupling the input terminal to a control terminal of the AC-coupled amplifier. The voltage biasing circuit includes a voltage source coupled to the control terminal, with the voltage biasing circuit including a differential-input amplifier having a noninverting input coupled to the voltage source, an inverting input, an output terminal and a differential voltage gain characteristic that decreases as a function of frequency. A resistor is coupled between the inverting input and the output terminal, and the control terminal of the AC-coupled amplifier is coupled to the inverting input of the differential-input amplifier. In this manner, a low-impedance DC-voltage biasing source is provided for an AC-coupled amplifier without using an inductor.

REFERENCES:
patent: 4849712 (1989-07-01), Jarrett
patent: 5345191 (1994-09-01), Tanaka
patent: 5432479 (1995-07-01), Wong
"A Simple Four-Quadrant Analogue Divider", by P. Pampaloni, Electronic Engineering, Jan. 1979, p. 18.
"Active Circuit to Cancel Power Supply Electrical Noise", IBM Technical Disclosure Bulletin, vol. 30, No. 4, Sep. 1987, pp. 1813-1815.

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