High resolution, fully differential CMOS comparator

Details High resolution, fully differential CMOS comparator High resolution, fully differential CMOS comparator

1989-10-05

1990-10-23

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307279, 307530, 307494, 330253, 330258, 330311, H03K 524, H03K 3356

Patent

active

049654683

ABSTRACT:
A high resolution, fully differential, CMOS comparator advantageously employs a single high-gain, "folded cascode", fully differential operational amplifier and an output latch circuit and the output common mode control of the high-gain amplifier is implemented without requiring the use of a conventional control circuit, thus improving layout economy. The common mode control is performed by providing the latch with a differential input stage through which a common mode feedback network is realized which acts upon a pair of output transistors of the operational amplifier for effectively controlling the output common mode thereof. The comparator has a simplified layout and is remarkably faster because it has no additional capacitances loading the outputs of the amplifier.

REFERENCES:
patent: 4521703 (1985-06-01), Dingwall
patent: 4717838 (1988-01-01), Brehmer et al.
patent: 4808944 (1989-02-01), Taylor

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