摘要:
In einer Schaltungsanordnung zum Synchronisieren der Phase eines frequenzgeteilten Signals mit einer Flanke (F) endlicher Steigung eines im wesentlichen periodischen Synchronisiersignals mit einem ein Taktsignal abgebenden Oszillator (1), einem Frequenzteiler (4), der das frequenzgeteilte Signal erzeugt, und einem Phasendetektor (39), der eine erste Vergleichsanordnung (10) zur Grobphasendetektion, eine zweite Vergleichsanord nung (19) zur Feinphasendetektion sowie eine Auswahlschal tung (31) umfaßt, die ein resultierendes Phasensignal, das dem Oszillator zum Steuern der Frequenz des Taktsignals zugeführt wird, im Falle großer Phasenabweichungen aus dem Grobphasenvergleich und im Falle geringer Phasenab weichungen aus dem Feinphasenvergleich ableitet, wird bei einem amplitudendiskreten Synchronisiersignal mit beg renzter zeitlicher Auflösung dennoch eine genaue Einstel lung auf die Flanke F dadurch erreicht, daß das Synchroni siersignal dem Phasendetektor (39) in Form einer Folge amplitudendiskreter Werte zugeführt wird, die durch Abtasten des Synchronisiersignals mit dem Taktsig nal gebildet wird, wobei für die Flanke (F) im Synchronisier signal eine aus reichende Anzahl Amplitudenstufen vorgesehen ist.
摘要:
Pulse corrector, for a phase locked loop, with first (R) and second (V) outputs coupled with a digital phase detector (DPD) and with first (T) and second (S) inputs coupled with a reference source and with the output of a controlled oscillator (VCO) respectively. After the end of an interruption of the reference source, at the first input there is generated a pulse (TL) whose first edge never leads the corresponding first edge at the second output and whose duration is not substantially smaller than the duration of a pulse (S4) at the second input.
摘要:
Disclosed is an apparatus for synchronizing a first signal wilh a second signal comprising a plurality of delay means D i as i goes from 1 to N, where N is an integer, each delay means D i having an input I i and a delay output O i for delaying a signal received at the respective input I, by an increment 8t of time in supplying the delayed signal at the respective delay output O i . The first delay means D, of the plurality of delay means is connected to receive the first signal at its input I 1 . Each of the other delay means D,, for i equal to 2 to N, are connected in series such that the respective input I i is connected to receive the delay output O i-1 of the preceding delay means D i-1 . A plurality of latch means L i , as i goes from 1 to N, are connected to be clocked by the second signal. Each of the latch means L i latches the signal at the delay output O i respectively for each of the delay means D i , in response to the second signal and supplies the latched signal at a respective latch output Q i . Output logic means, responsive to at least a subset of the plurality of delay outputs O i and plurality of latch outputs Q i , for supplying essentially a phase-shifted copy of the first aignal synchronized with the second signal is provided.
摘要:
Bei einer Störung des Referenzsignals wird dem Phasen diskriminator anstelle des Referenzsignals ein zum vom Oszillator erzeugten Takt OT, der ebenfalls dem Phasendis kriminator zugeführt ist, inverses Signal OT zugeführt.
摘要:
Eine Positionsregelschaltung umfaßt eine erste Vorrich tung (116) zum Erzeugen einer Phasendifferenz zwischen einem Referenzsignal und einem darauf bezogenen Ein gangssignal, das durch ein Regelsignal bestimmt ist, und eine zweite, mit der ersten Vorrichtung gekoppelte Vorrich tung zum Erzeugen eines Positionsregelsignals, das propor tional zur Phasendifferenz zwischen dem Referenzsignal und dem Eingangssignal ist.
摘要:
Die vorliegende Erfindung betrifft einen Regelverstärker innerhalb eines Phasenregelkreises (PLL). Um unabhängig voneinander das Gleichspannungs- bzw. Niederspannungssignal und das Hochfrequenzsignal in einem gewünschten optimalen Maß verstärken zu können, ist der Regelverstärker aus der Parallelschaltung eines Niederfrequenzverstärkers (NFV) und eines Hochfrequenz verstärkers (HFV) gebildet.
摘要:
In a Global Positioning System type of navigation system, a biphase modulated radio frequency input signal is applied to the "front end" (11) of a double heterodyne receiver having a second intermediate frequency stage which operates in the audio frequency range. The audio output signal is phase locked to a 1 KHz reference signal and is applied to a microprocessor (24) for processing via an interface circuit which includes a relatively simple amplitude detector (51) and a biphase detector (54). The microprocessor (24) also controls the phase shifting of a pseudorandom noise code generator (70) whose output is modulated with the output of the first intermediate frequency stage of the receiver.
摘要:
An all digital circuit which operates with an electronic oscillator of the type that receives an input signal and synchronizes its oscillations to transitions in the input signal, comprises: a pulse-generating circuit (20) coupled to the oscillator for digitally forming periodic pulses in synchronization with selected oscillations of the oscillator; a detecting circuit (30) coupled to receive the pulses and the input signal for digitally detecting whether a transition occurs in the input signal in the absence of a pulse; and a counting circuit (40) coupled to the detecting circuit for digitally counting so long as the detecting circuit fails to detect a transition in the absence of a pulse and for indicating the oscillator is synchronized when the count reaches a predetermined number.
摘要:
@ An oscillating circuit using a phase locked loop which includes a voltage controlled oscillator (6), a phase comparator (3), a low pass filter (4) and a phase extractor (8) has a small circuit scale. Every repeat period of a reference pulse signal being provided to one input terminal of the phase comparator (3) and having a frequency of I/N times of an oscillating frequency of the voltage controlled oscillator, one of leading edges of the output pulses of the voltage controlled oscillator (6) near a leading edge of the reference pulse signal is selectively extracting by the phase extractor (8). The extracted leading edge of the output pulse of the voltage controlled oscillator (6) is provided to another input terminal of the phase comparator (3) and phase-compared with the leading edge of the reference pulse signal by the phase comparator (3). A phase error signal generated from the phase comparator (3) is supplied through the low pass filter (4) to the voltage controlled oscillator (6) as a control voltage thereof in order to stable the oscillating frequency.