Digitized synchronous demodulator

Details Digitized synchronous demodulator Digitized synchronous demodulator

1989-10-10

1990-11-27

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Input signal split into plural signals

328151, H03D 100

Patent

active

049739140

ABSTRACT:
A digitized synchronous demodulator is constructed entirely of digital components including timing logic, an accumulator, and means to digitally filter the digital output signal. Indirectly, it accepts, at its input, periodic analog signals which are converted to digital signals by traditional analog-to-digital conversion techniques. Broadly, the input digital signals are summed to one of two registers within an accumulator, based on the phase of the input signal and mediated by timing logic. At the end of a predetermined number of cycles of the inputted periodic signals, the contents of the register that accumulated samples from the negative half cycle is subtracted from the accumulated samples from the positive half cycle. The resulting difference is an accurate measurement of the narrow band amplitude of the periodic input signal during the measurement period. This measurement will not include error sources encountered in prior art synchronous demodulators using analog techniques such as offsets, charge injection errors, temperature drift, switching transients, settling time, analog to digital converter missing code and linearity errors.

REFERENCES:
patent: 3925732 (1975-12-01), Tanaka et al.

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