Optical-input latch-circuit cell array

Details Optical-input latch-circuit cell array Optical-input latch-circuit cell array

1992-11-18

1994-01-25

Messinger, Michael

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214A, 250551, 359189, 307311, H01J 4014, G02B 2700, H03K 342

Patent

active

052818055

ABSTRACT:
An optical latch circuit is used for an optical-input section in a processor chip having a plurality of processor units each of which includes a processing section and an optical-input section. The optical input section includes a two-dimensional array, or matrix, of optical latch circuits. The optical latch circuit comprises a photodiode, coupled to a differential amplifier circuit having two CMOS circuits and a latch switch; a PMOS transistor of one of the CMOS circuits receives a control voltage from an auto-zero negative feedback circuit to produced threshold values by itself; and a PMOS transistor of the other CMOS circuit receives a control voltage from an optical-input stabilizing circuit, complementary to the auto-zero negative feedback circuit. The optical input of the photodiode is latched and amplified by turning on and off the latch switch in synchronism with the control clock, for transmission of digital electrical signals to input gates in the processing section.

REFERENCES:
patent: 4853530 (1989-08-01), Muto
patent: 4935636 (1990-06-01), Gural
patent: 4996529 (1991-02-01), Connell
patent: 5010245 (1991-04-01), Dicrikx
patent: 5045680 (1991-09-01), Fan et al.
patent: 5055668 (1991-10-01), French
patent: 5083044 (1992-01-01), Mead et al.

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