Method and circuitry for demodulation of angle modulated signals

Details Method and circuitry for demodulation of angle modulated signals Method and circuitry for demodulation of angle modulated signals

1992-07-16

1993-12-14

Grimm, Siegfried H.

Demodulators

Frequency modulation demodulator

Input signal converted to and processed in pulse form

329342, 329343, 329345, 375 82, 375 94, H03D 300

Patent

active

052706664

ABSTRACT:
An FM or PM signal is demodulated so that the cycle time of the modulated input signal is measured using a time-to-digital converter comprising a counter that uses a moderate clock frequency as a reference clock, a digital delay line interpolator and a control circuitry. The counter is used for rough digitization and the delay line for interpolating the moment of zero-crossing inside a clock cycle. Total delay of the delay line, i.e., the range of time intervals the interpolator is able to measure, is actively kept equal to the cycle time of the reference clock. When the number of delay elements in the delay line is a power of two, the result of the delay line interpolator may be used directly as the least significant bits of the measurement.

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Chu: Phase digitization sharpens timing measurements, IEEE Spectrum, Jul. 1988, pp. 28-32.
Rahkonen, T., Time interval measurements using integrated tapped CMOS delay lines, pp. 202-205, Proc. 32nd Midwest Symposium on Circuit and Systems, Urbana, Ill., USA, Aug. 1989.
Rahkonen, T., The use of CMOS ASICs in applications requiring high timing accuracy, Licentiate Thesis, University of Oulu, Finland, Aug. 1990.

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