Comparator with smooth start-up for high frequencies

Details Comparator with smooth start-up for high frequencies Comparator with smooth start-up for high frequencies

1995-10-10

1997-02-25

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327563, 327333, 330254, H03K 522

Patent

active

056062729

ABSTRACT:
A comparator has a simple high frequency signal path from input to output formed by two differentially connected transistors with an output transistor connected to each. A current control circuit maintains a constant total current flowing through the differentially connected transistors. The ratio of currents flowing through the differentially connected transistors is initially set by a control circuit, so that the output of the comparator is predictable when powered up. The control circuit then gradually releases control, so that there is a smooth transfer to control by a reference signal input to the comparator.

REFERENCES:
patent: 4847567 (1989-07-01), Fenk
patent: 5313207 (1994-05-01), Kouno et al.
patent: 5341120 (1994-08-01), Nakajima
patent: 5475323 (1995-12-01), Harris et al.

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