Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1988-09-20
1989-12-26
Zazworsky, John
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307494, 328146, H03K 524
Patent
active
048900141
ABSTRACT:
A device for comparing currents comprises a first resistor (R1) connected between a high voltage source (VCC) and a connection node (N), first and second current source (I1, I2) connected between a low voltage source (VEE) and the connection node by first and second switches (S1, S2) closed during the first and second phases, a first differential amplifier (A1), a first input (-) of which is connected with the connection node by a first capacitor (C1), a second input (+) of which is connected with an intermediate voltage source, and the output of which is connected with the input (-) by a third switch (S3) closed during the first phase, a second resistor (R2) having a high value with respect to the first resistor connected between the connection node and the intermediate voltage source, and servo-control means operating during a phase preliminary to the first and second phases for urging the voltage on the connection node to be equal to the intermediate voltage, when the first switch is closed.
REFERENCES:
patent: 3237116 (1966-02-01), Skinner et al.
patent: 3321628 (1967-05-01), Webb
patent: 4553052 (1985-11-01), Takahashi
patent: 4707624 (1987-11-01), Yee
patent: 4748418 (1988-05-01), Kerth
K. Hoskins, "Autozero Chip Cuts Op Amp Offset Voltages to a Mere .+-.5 uV", Electronic Design, vol. 33, No. 7 (Mar. 21, 1985).
SGA-Thomson Microelectronics S.A.
Zazworsky John
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