Synchronous demodulator

Details Synchronous demodulator Synchronous demodulator

1989-08-24

1992-03-24

Jaworski, Francis

Surgery

Truss

Pad

A61B 802

Patent

active

050978373

ABSTRACT:
A synchronous demodulator for the demodulation of ultrasound burst waves reflected by a moving object comprises an operational amplifier forming an integrator. When a MOSFET switch in the input line of the amplifier is conductive, it operates as a low-pass filter. If, on the other hand, this switch is in the high-impedance state, the actual value is stored by the capacitor. The circuit is switched between filtering mode and hold mode by a demodulator clock. The circuit incorporates the functions of demodulator, a low-pass and a hold circuit.

REFERENCES:
patent: 3813654 (1974-05-01), Clifton et al.
patent: 3898653 (1975-08-01), Ban et al.
patent: 4010424 (1977-03-01), Faulkner
patent: 4848355 (1989-07-01), Nahamura et al.
Kardiotokograph zur uberwachung Der Fetal-Herafrequenz, 2087, Elektronik, vol. 26, No. 7, 1977, Juillet.
"Analog-Digital-Conversion Handbook", edited by David H. Sheingold, Prentice-Hall, Englewood Cliffs, N.J. 07632, (1986), pp. 565-568.

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