Sinewave generating circuit and amplitude demodulator

Details Sinewave generating circuit and amplitude demodulator Sinewave generating circuit and amplitude demodulator

1993-02-26

1994-11-29

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

32420716, 34087031, 327105, 327129, G01B 714, H01F 2102, G08C 1906, G08C 1912

Patent

active

053693752

ABSTRACT:
An integrated circuit for driving a sensor includes an oscillator for providing a first clock signal synchronized to a periodic waveform supplied by an external source. A second clock signal in the form of a uni-polar square wave is derived from the first clock signal. A sinewave signal is generated by consecutively selecting voltage steps from a resistor ladder under control of the second clock signal. A low-pass filter removes from the sinewave signal higher frequency harmonics generated by switching through the steps of the resistor ladder. A linear amplifier utilizes an external capacitor to couple the filtered sinewave signal to the sensor. Temperature compensation is provided by comparing the voltage of the sinewave signal supplied to the sensor with an external temperature stable reference voltage. The integrated circuit also includes circuitry for amplitude demodulating a signal returned from the sensor to provide a sensor output signal.

REFERENCES:
patent: 5180987 (1993-01-01), Wendt
Signetics Data Sheet AN 1182--Dec. 1988 pp. 5-363--5-375, Zahid Rahim.
Signetics Data Sheet AN 1181--Copyright Dec. 1988 pp. 5-359--5-362, Zahid Rahim.
Signetics Data Sheet AN 1180 .COPYRGT. Dec. 1988 pp. 5-344--5-358, Hadley et al.
Signetics Data Sheet AN 118 .COPYRGT. Dec. 1988 pp. 5-329--5-339, Application Note.
Signetics Data Sheet NE 5520 .COPYRGT. Apr. 28, 1988 pp. 5-324--5-328, Product Specification.

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