Evaluation circuit for electrical signals

Details Evaluation circuit for electrical signals Evaluation circuit for electrical signals

1980-11-24

1982-12-14

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307264, H03L 500, H03K 1302, H03K 906

Patent

active

043639798

ABSTRACT:
Signals from a coil producing pulses in response to flux variations produced by a rotary member driven by an engine crankshaft are applied in push-pull through series resistors to the inverting and non-inverting inputs of a comparator. A variable voltage divider for the input signals is provided by a pair of complementary transistors respectively connecting the comparator inputs to opposite poles of a fixed voltage supply. The comparator pulses charge a capacitor through a transistor, the capacitor being periodically discharged through a resistor, once per crankshaft revolution. An increase of capacitor voltage beyond a very small amount progressively lowers the resistances provided by the transistors connected to the comparator inputs, acting on one of them simply through a transistor and on the other through a transistor and a current mirror circuit. In order to compensate for the temperature dependent leakage current of the transistor driven by the comparator output in order to charge the capacitor, a second current mirror is provided that prevents charging of the capacitor during the blocked-condition of the transistor in question. A supplementary voltage divider is connected through isolating series resistors to set the d.c. level of the comparator inputs when the transistors connected to these inputs are non-conducting.

REFERENCES:
patent: 3872388 (1975-03-01), James
patent: 4166248 (1979-08-01), Bianchi et al.
patent: 4234940 (1981-01-01), Ruof

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