High speed comparator circuit with single supply voltage

Details High speed comparator circuit with single supply voltage High speed comparator circuit with single supply voltage

1987-12-30

1989-06-20

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307300, 307362, 307491, 307494, H03K 524

Patent

active

048411710

ABSTRACT:
An improved high speed comparator having the compatible open collector output in TTL to use the single supply voltage and reduce the non-symmetrical distortion even by using only NPN transistors without using PNP transistors which are taken as the limit element of the high speed. Forward base-emitter voltage of transistor Q6 is matched with base-emitter voltage of transistor Q11, base-emitter voltage of transistor Q5 is matched with base-emitter voltage of transistor Q12, and reverse emitter-collector voltage of transistor Q7 is matched with reverse emitter-collector voltage of transistor Q10. When resistance R1 equals one-half of resistance R2, voltage drop across R2 equals the base-emitter voltage of transistor Q13, and well balanced square waves may be generated by driving transistors Q1, Q2 with a single current source.

REFERENCES:
patent: 4147944 (1979-04-01), Monticelli
patent: 4406955 (1983-09-01), LoCascio
patent: 4577121 (1986-03-01), Sano et al.

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