Clamping circuit for adjusting a level of a transmitted signal a

Details Clamping circuit for adjusting a level of a transmitted signal a Clamping circuit for adjusting a level of a transmitted signal a

1994-06-30

1996-03-19

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327327, 327563, H03G 1100, H03K 508

Patent

active

055006175

ABSTRACT:
A clamping circuit has a differential amplifier having a pair of transistors for comparing a voltage of an output node and a constant clamp voltage. The pair of transistors has a common emitter node supplied with a constant current from a first current source. An output of the differential amplifier is supplied to a base of a transistor for charging the output node. The output node is discharged constantly by a second current source. The constant current from the first current source is twice as large as the constant current from the second current source. The first and second current sources are controlled and activated to generate the first and second currents according to a current control signal. The clamping circuit also has a current control circuit for setting a value of each of the first and the second constant currents. The current control circuit is controlled by a clamp control signal and selectively activates the circuit and second current sources.

REFERENCES:
patent: 4277703 (1981-07-01), Wada et al.
patent: 4367441 (1983-01-01), Niyada et al.
patent: 4634890 (1987-01-01), Lee
patent: 4644198 (1987-02-01), Ahmed
patent: 4897560 (1990-01-01), Saito et al.
patent: 4984207 (1991-01-01), Tateno et al.
patent: 5021682 (1991-06-01), Hobrecht
patent: 5061862 (1991-10-01), Tamagawa
patent: 5280200 (1994-01-01), Tarng

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