Low-hysteresis regenerative comparator

Details Low-hysteresis regenerative comparator Low-hysteresis regenerative comparator

1989-12-26

1991-02-05

Miller, Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307530, 307279, 307362, H03K 326, H03K 329, H03K 5153, H03F 345

Patent

active

049907999

ABSTRACT:
A regenerative comparator with a differential amplifier pair of transistors (Q.sub.1D, Q.sub.1E, Q.sub.2D, and Q.sub.2E) and a differential regenerative pair of transistors (Q.sub.3D, Q.sub.3E, Q.sub.4D, and Q.sub.4E), utilizes one or more of the following three techniques to reduce hysteresis by reducing the amount of charge storage in transistors. First, the transistors are arranged in a bootstrap cascode configuration having a depletion mode device (Q.sub.D) and an enhancement mode device (Q.sub.E). Second, a differential amplifier pair source-coupling implementation (D.sub.1 -D.sub.4, Q.sub.5A -Q.sub.5C, and Q.sub.6A -Q.sub.6C) allows current to flow through the transistors of the differential amplifier pair and differential regenerative pair independent of whether current is flowing through the branch (52 or 4) that connects the emitters or sources of the enhancement devices of the amplifier pair and regenerative pair. Third, the comparator includes keep-alive current sources (Q.sub.KA1 -Q.sub.KA4) that allow current to flow through the amplifier pair and regenerative pair independent of the magnitude of the difference in gate input voltages being compared.

REFERENCES:
patent: 4121120 (1978-10-01), Wetterling
patent: 4418402 (1983-11-01), Heagerty et al.
patent: 4439694 (1984-03-01), Fox
patent: 4629911 (1986-12-01), Bebernes et al.
patent: 4656371 (1987-04-01), Binet et al.
P/O Trigger Board A2 on pp. 7-13 of the Preliminary Manual Hewlett Packard Model 8091A Generator Module Operating and Service Manual, and cover sheet for the Operating and Service Manual.
Giles and Seales, "A New High-Speed Comparator the Am685," Advanced Micro Devices Analog and Communication Product Databook, 1983, pp. 2-42 to 2-50.
Ducourant, et al., "3 GHz, 150 mW, 4 bit GaAs Analogue to Digital Converter," 1986 GaAs IC Symposium, pp. 209-212.
Ducourant, et al., "N-On Versus N-Off GaAs MESFET's for an Ultra High Speed Comparator," 11th International Conference on GaAs and Related Compounds, Biarritz, France 26-28 Sep. 1984, pp. 1-6.

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