Pulse generators with constant mark/space ratio and small phase

Details Pulse generators with constant mark/space ratio and small phase Pulse generators with constant mark/space ratio and small phase

1990-03-14

1991-12-03

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307265, 328 13, 328 14, H03K 2102, H03K 700

Patent

active

050702548

ABSTRACT:
A digital oscillator produces a succession of numbers from which a periodic analogue waveform is produced. These numbers represent a triangular waveform (or a sine waveform). Their direct conversion into analogue form by a digital-to-analogue converter, followed by integration by an integrator produces a distorted analogue waveform SW which when limited by a limiter produces an output pulse waveform with an inaccurate mark/space ratio. A subtraction circuit 2 subtracts each number produced by the digital pulse generator from the previous number, to produce a series of new numbers which represent a pre-distorted waveform. When these new numbers are converted into analogue form, the integration of the resulting waveform by the integrator produces an analogue waveform with clearly defined zero crossings. The output pulse waveform is thereby given a relatively constant mark/space ratio. Furthermore, when the pulse generator is driven by a clock whose frequency is several times greater than the frequency of the output pulse waveform, the latter suffers only small phase modulation (jitter).

REFERENCES:
patent: 3772681 (1973-11-01), Skingle
patent: 4003003 (1977-01-01), Haeberlin
patent: 4740995 (1988-04-01), Schevin et al.
patent: 4758971 (1988-07-01), Wright
patent: 4823090 (1989-04-01), Coleman et al.
patent: 4901265 (1990-02-01), Kerr et al.
A. Bateman et al., "Digital Signal Processing Design", Computer Science Press, published by Pitman in Great Britain in 1988, pp. 288-291.

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