Wide band constant duty cycle pulse train processing circuit

Details Wide band constant duty cycle pulse train processing circuit Wide band constant duty cycle pulse train processing circuit

1984-07-19

1986-07-08

Olms, Douglas W.

Pulse or digital communications

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Direct sequence

375 49, 360 42, 360 51, 307234, 307517, H04L 702, H04L 2710

Patent

active

045997365

ABSTRACT:
A wide band constant duty cycle pulse train processing circuit where the pulse train frequency varies is proposed. The circuit serves primarily to obtain the basic clock in decoding signals encoded in the bi-phase mark code and includes a pulse-shaping or wave-shaping circuit, which receives the data signals and is followed by a low-pass filter; a differential amplifier circuit, one input of which is connected to the output of the low-pass filter and the other input of which is connected to a variable voltage source; and a current source, controlled by the differential amplifier circuit, at the input of the wave-shaping circuit determining the pulse length. The closed control loop between the output and the input of the wave-shaping circuit that determines the pulse length causes the duty cycle established at the variable voltage source to be maintained over wide ranges of the incident pulse train frequency.

REFERENCES:
patent: 3727202 (1973-04-01), Fort
patent: 3946322 (1976-03-01), Katz
patent: 4230970 (1980-10-01), Potter et al.
patent: 4253187 (1981-02-01), Geise et al.
patent: 4267595 (1981-05-01), Hernandez
patent: 4277697 (1981-07-01), Hall et al.
"A Standardised Time-and-Control Code for 625-Line/50-Field Television Tape-Recordings" by R. van der Leeden--Jun. 1973, Journal of the SMPTR, vol. 82--pp. 482-491.

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