Adaptive input circuit

Details Adaptive input circuit Adaptive input circuit

1980-01-17

1981-07-14

Kreitman, Stephen A.

Measuring and testing

Vibration

By mechanical waves

73625, 330284, G01N 2900

Patent

active

042779782

ABSTRACT:
An input circuit is disclosed for variably adapting the dynamic range of an ultrasonic frequency electrical signal to the dynamic range of a signal receiver to which the signal is applied. A band pass filter admits the appropriate band of signal frequencies to the receiver to provide optimum signal-to-noise conditions. A JFET device is shunted across the receiver input and its drain-to-source impedance is varied to control the peak voltage developed by the signal. Control of the impedance of the JFET device may be effected in a pre-programmed manner as a function of time, in response to the amplitude of the signal applied to the receiver input, or in response to both. In either case, the amplitude of the applied signal is constrained to remain substantially within the dynamic range of the receiver.

REFERENCES:
patent: 3185936 (1965-05-01), Fuller
patent: 3701059 (1972-10-01), Nyswander
patent: 3967209 (1976-06-01), Skoures
patent: 4048573 (1977-09-01), Evans et al.
patent: 4234940 (1980-11-01), Iinuma

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