Absolute magnitude circuit

Electrical transmission or interconnection systems – Switching systems – Condition responsive

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Details

307494, 328 26, H03K 520, H03K 500

Patent

active

044594933

ABSTRACT:
An absolute magnitude circuit is provided wherein an input signal is fed to one input of a differential amplifier circuit, the output of such amplifier circuit being coupled to a second input thereof through a negative feedback loop, such feedback loop having two output terminals with an inverter coupled therebetween; and a switching circuit, responsive to the polarity of the input signal, for coupling a selective one of the pair of output terminals to an output of the absolute magnitude circuit, with the voltage at the output of the absolute value circuit having the same polarity independent of the polarity of the input signal.
With such arrangement, since the input circuitry to the operational amplifier is independent of the polarity of the input signal, the gain and biasing of the absolute magnitude circuitry is independent of input signal polarity.

REFERENCES:
patent: 2822474 (1958-02-01), Boecker
patent: 3509474 (1970-04-01), Arnold et al.
patent: 4317052 (1982-02-01), Morris
patent: 4354235 (1982-10-01), Blakeslee

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