Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1982-09-27
1985-02-19
Heyman, John S.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307490, 307362, 328142, H03K 326, G06G 712
Patent
active
045007985
ABSTRACT:
A pair of voltage followers, having offsets which differ by a fraction of the threshold voltage of a diode, are coupled to respective sources of signal and load voltage to provide unequally offset ouput voltages. An amplifier, coupled to the voltage followers, provides an output current when the difference of the signal and load voltages is of a given sense and magnitude, the output current being substantially zero otherwise. The amplifier includes a transconductance control element for regulating the differential voltage-to-current conversion gain thereof and a current mirror for applying the output current to the load in a sense to reduce difference between the signal and load voltages thereby simulating a diode having independently controllable threshold voltage and forward conductance characteristics, having negligible reverse conduction, which provides a power gain with high stability and substantially no tendency toward oscillations and which may be constructed in integrated circuit form without need for special processing steps. In an exemplary application, the simulator includes plural amplifiers for controlling dead zones of an adaptive control signal filter of an audio signal expander.
REFERENCES:
patent: 3350512 (1967-10-01), Percival et al.
patent: 3541350 (1970-11-01), Luetze
patent: 4251742 (1981-02-01), Beelitz
Coalter R. G.
Davis B. P.
Heyman John S.
Rasmussen P. J.
RCA Corporation
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