Comparator

Details Comparator Comparator

1992-11-20

1993-12-28

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307354, 307355, 307530, 307494, H03K 5153, H03K 524

Patent

active

052742750

ABSTRACT:
A comparator indicates the relative magnitudes of input and reference signals with improved immunity to noise signals. The comparator includes first and second transistors differentially connected to receive the input and reference signals. Third and fourth transistors connected in a latching relationship are responsive in first alternate half cycles of clock signals to the outputs from the first and second transistors to provide a regenerative action on these outputs. In first portions of the first alternate half cycles of the clock signals, a degenerative action is provided by fifth and sixth transistors respectively on the third and fourth transistors to prevent the third and fourth transistors from regenerating until the input difference voltage of these transistors has had time to increase relative to the input noise on these transistors. The fifth and sixth transistors may be provided with sizes corresponding to, or preferably sightly greater than, those of the third and fourth transistors. A seventh transistor connected to the fifth and sixth transistors provides current flow through the fifth and sixth transistors during the second alternative half cycles, and only during the first portion of the first alternate half cycles of the clock signals. An eighth transistor connected to the third and fourth transistors balances the operation of the third, fourth and eighth transistors with the operation of the fifth, sixth and seventh transistors. In the second alternate half cycles of the clock signals, a math transistor clamps the third and fourth transistors to a common voltage level.

REFERENCES:
patent: 4511810 (1985-04-01), Yukawa
patent: 4521703 (1985-06-01), Dingwall
patent: 4814642 (1989-03-01), Kleks
patent: 4814648 (1989-03-01), Hynecek

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