Voltage comparator

Details Voltage comparator Voltage comparator

1984-05-24

1985-09-03

Anagnos, Larry N.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307246, 307355, 307362, H03K 524, H03K 3023

Patent

active

045394954

ABSTRACT:
The voltage comparator includes a first and a second voltage supply terminal, and a first and a second output node. A first current source is connected between the first supply terminal and the first output node. A first field effect transistor of one channel conductivity type is connected between the first output node and the second supply terminal. The gate of the first transistor is connected to the second output node. A second current source is connected between the first supply terminal and the second output node. A second field effect transistor of the one conductivity is connected between the second output node and the second supply terminal. The gate of the second transistor is connected to the first output node. During a first period of time the first and second output nodes and the capacitances of the gates of the first and second transistors connected thereto are maintained at the potential of the second supply terminal by switches connected thereacross. At the end of the first period the switches are opened allowing the first and second output nodes to charge. Simultaneously charge proportional to a first signal voltage is supplied to the first output node and charge proportional to a second signal voltage is supplied to the second output node. The node which receives the greater charge rapidly charges toward the voltage of the first supply terminal and the node which receives the smaller charge is maintained at the potential of the second supply terminal. Thus, an indication is obtained of the greater of the two voltages.

REFERENCES:
patent: 4007381 (1977-02-01), Mohsen
patent: 4096402 (1978-06-01), Schroeder et al.
patent: 4149099 (1979-04-01), Nagami
patent: 4181865 (1980-01-01), Kohyama
patent: 4412143 (1983-10-01), Patella et al.
patent: 4485317 (1984-11-01), Davies, Jr.

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