Electrical pulse counters – pulse dividers – or shift registers: c – Systems – Pulse multiplication or division
Patent
1991-06-14
1992-09-01
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Systems
Pulse multiplication or division
328 20, 307273, H03B 1910
Patent
active
051446456
ABSTRACT:
A monostable multivibrator having a time constant that is approximately one-quarter of the period of a pulse signal supplied to its input is used for frequency doubling of a 50% keying ratio input pulse signal. The output signals of the multivibrator are low-pass filtered and supplied to inputs of a different amplifier operating as a difference integrator by virtue of a capacitance connected between its output and its inverting input. This output is utilized to modify the time constant when the period of the input pulse sequence becomes more than about four times the time constant of the multivibrator, thus keeping the keying ratio of the output signals at 50% over a wide range of variation of the frequency of the usually symmetrically input pulse sequence. The multivibrator is connected so as to be triggered by both rising and falling flanks of the input pulses. Both ECL and TTL embodiments are shown.
REFERENCES:
patent: 3838344 (1974-09-01), Tanimoto
patent: 3909717 (1975-09-01), Gazzano
patent: 4398153 (1983-08-01), Rittenbach
patent: 4439689 (1984-03-01), Chazenfus
patent: 4596954 (1986-06-01), Haque
BTS Broadcast Television Systems GmbH
Heyman John S.
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