The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 01, 1992
Filed:
Jun. 14, 1991
Rolf Schiffmann, Mainz, DE;
BTS Broadcast Television Systems GmbH, Darmstadt, DE;
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.