Latching comparator

Details Latching comparator Latching comparator

1985-03-15

1986-12-16

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307530, 307279, H03K 524

Patent

active

046299114

ABSTRACT:
A comparator includes a source degenerated latching differential amplifier and an input differential amplifier interconnected in stacked fashion and connected with the input amplifier having inverting and non-inverting outputs coupled respectively for positive feedback to the inverting and non-inverting inputs of the latching amplifier. Means are provided to limit the relative difference between the signals at the inverting and non-inverting inputs to the latching amplifier so that when the latching amplifier is activated a minimum current will always be present in both sides of the samplifier. Means are provided to selectively apply or not apply a common bias current to the latching amplifier such that on application thereof, the positive feedback from the input amplifier outputs causes the latching amplifier to drive the highest input amplifier output to a high voltage level limit and to drive the lowest input amplifier output to a low voltage level limit. The input amplifier outputs are maintained at such high and low levels until the bias current is switched away from the latching amplifier.

REFERENCES:
patent: 4549100 (1985-10-01), Spence

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