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:
Oct. 31, 1978
Filed:
Sep. 15, 1977
Peter Schucht, Munich, DE;
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Abstract
A circuit for synchronizing an oscillator keyed by a pulse is provided with a low amplitude reference oscillation. A phase shift regulating loop has a phase discriminator which is fed, on one hand, with a branched component of the oscillator output and, on the other hand, with the reference oscillation. The phase discriminator compares the phases of the two oscillators and emits a resultant regulating voltage an adjustable reactance for controlling the oscillator frequency during the leading edge of the keying pulse. A phase shift device, adjustable over 180.degree., is connected between the oscillator and the phase discriminator, the phase discriminator having a high-ohmic output which is connected, via an impedance converter, to the adjustable reactance. A sampling switch is interposed between the impedance converter and the adjustable reactance, the switch being closed at the beginning of a pulse and opened shortly before the end of a pulse, the pulses being of predetermined duration, and a holding circuit holds the regulating voltage at least to an approximate value across the adjustable reactance prior to the end of a pulse, until the closing of the sampling switch.