Wide common mode range comparator and method

Details Wide common mode range comparator and method Wide common mode range comparator and method

1995-08-08

1997-03-25

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 65, 327 77, 327 89, H03K 522

Patent

active

056148526

ABSTRACT:
A transconductance amplifier suitable for the input stage of a comparator with the capability of amplifying input signal with common mode voltage components in a range including the entirety of its operating voltage. Operation at one voltage extreme is accomplished by use of a long tailed pair connection of a pair of bulk modulated FETs with gates at the input terminals of the amplifier. Operation at the other voltage extreme is accomplished by the use of a pair of FETs in a source follower mode to drive common gate transistors of opposite polarity, the gates of the FETs also being connected to the input terminals of the amplifier. A common high impedance load for the comparator is connected to current mirrors of the drains of both pairs of FETs in the amplifier. The circuit may be implemented with bipolar transistors and additional amplification provided. Methods of comparing voltages are also disclosed.

REFERENCES:
patent: 4333058 (1982-06-01), Hoover
patent: 5223753 (1993-06-01), Lee et al.
patent: 5298809 (1994-03-01), Yamaguchi
patent: 5319267 (1994-06-01), Kimura
patent: 5362995 (1994-11-01), Kubo
patent: 5453718 (1995-09-01), Kurokawa et al.

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