Input circuit for level-shifting TTL or CMOS to ECL signals

Details Input circuit for level-shifting TTL or CMOS to ECL signals Input circuit for level-shifting TTL or CMOS to ECL signals

1994-04-08

1995-10-31

Hudspeth, David R.

Electronic digital logic circuitry

Interface

Logic level shifting

326 31, H03K 19018

Patent

active

054633290

ABSTRACT:
An input circuit which converts an input signal to an output signal. A first level comparator has a first input to which the input signal is applied and a second input to which a first reference voltage is applied for comparison with the input signal, and an output which the output signal is manifested. A second level comparator has a first input connected to the first input of the first level comparator for application one input signal, and a second input to which a second reference voltage is applied for comparison with the input signal, with the second level comparator limiting the voltage at the first input of the first level comparator to substantially the second reference voltage whenever the input signal exceeds the second reference voltage as determined by the second level comparator.

REFERENCES:
patent: 4518876 (1985-05-01), Constantinescu
patent: 4700087 (1987-10-01), Stroberger
patent: 4806800 (1989-02-01), Khan
patent: 5041743 (1991-08-01), Matsumoto
patent: 5075580 (1991-12-01), Dayton et al.
patent: 5349253 (1994-09-01), Ngo et al.

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