Oscillators – Automatic frequency stabilization using a phase or frequency... – Transistorized controls
Patent
1982-05-28
1984-11-27
Laroche, Eugene R.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Transistorized controls
331 17, 331 20, 331 25, 358 19, H03L 708
Patent
active
044853548
ABSTRACT:
Color reference oscillator comprises a non-inverting amplifier, with positive feedback via a crystal filter linking its output and input. A quadrature phase shift network, coupled to the filter output, delivers phase shifted signals to a pair of independently controlled amplifiers. One of the controlled amplifiers is responsive to control voltage outputs of a burst-responsive phase detector so as to inject phase shifted signals into the oscillator loop, as and when required, to effect synchronization of oscillator with burst component of incoming color television signal. The second of the controlled amplifiers is responsive to a reference DC voltage and to a manually adjustable DC control voltage, and develops a phase shifted signal output, of a magnitude and polarity dependent upon the magnitude and sense of the difference, if any, between the respective DC voltages, for combination with the non-inverting amplifier's output. Variation of the manually adjustable control voltage effects an adjustment of the free-running frequency of the oscillator.
REFERENCES:
patent: 3857110 (1974-12-01), Grebene
patent: 3869679 (1975-03-01), Grebene
patent: 4020500 (1977-04-01), Harwood
Frerking, M. E. Crystal Oscillator Design and Temperature Compensation, Van Nostrand Reinhold Co., N.Y., 1978, p. 143.
Application notes concerning RCA CA3070 chroma IC, entitled "Television Chroma System-File No. 468", appearing at pp. 359-363 of the publication entitled RCA Linear Integrated Circuits, 1975 DATABOOK Series, SSD-201C.
Schematic for Blaupunkt FM-120 color TV receiver chassis, employing Motorola TDA 3300 luma-chroma IC.
Harwood Leopold A.
Shanley, II Robert L.
LaRoche Eugene R.
Meagher William H.
Mis D. C.
Rasmussen Paul J.
RCA Corporation
LandOfFree
PLL Oscillator synchronizing system with DC control of free-runn does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with PLL Oscillator synchronizing system with DC control of free-runn, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and PLL Oscillator synchronizing system with DC control of free-runn will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2136526