BIAS circuit intended to determine the mean level of an AC volta

Details BIAS circuit intended to determine the mean level of an AC volta BIAS circuit intended to determine the mean level of an AC volta

1996-08-30

1998-06-23

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327319, H03K 1716

Patent

active

057709629

ABSTRACT:
A circuit that includes a series arrangement of a capacitive element (C) and an active component (M10) forming an equivalent resistor. A DC current source (120 is connected to the active component, and a transistor (M11, 11) is provided for altering the conductance of the active component and fixing the mean level of a AC voltage (U.sub.ac). Such a voltage is applied to the terminals of the series arrangement, and the biased voltage having the desired mean level (U.sub.out) is tapped off the node (10) between the capacitive element (C) and the active component. A capacitive voltage divider (13) is also provided for modulating the DC current (i) passing through the active component (M10), with a fraction of the AC voltage to be biased. The circuit is particularly applicable to the determination of the mean level of the voltage produced by a quartz oscillator.

REFERENCES:
patent: 4229703 (1980-10-01), Bustin
patent: 4814644 (1989-03-01), Yamakawa
patent: 4914316 (1990-04-01), Rossi et al.
patent: 5113129 (1992-05-01), Hughes
patent: 5333093 (1994-07-01), Krautschneider et al.

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