Low-noise frequency synthesizer

Details Low-noise frequency synthesizer Low-noise frequency synthesizer

1996-01-22

1998-08-04

Pascal, Robert

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 2, 331 11, 331 23, 375376, 329318, 329325, H03L 706, H03C 106

Patent

active

057899878

ABSTRACT:
A frequency synthesizer (100) is utilized for producing an output signal (124) which is phase locked to a reference signal (110) operating at a reference frequency. The frequency synthesizer (100) comprises a main phase lock loop (PLL) (102), and a tracker PLL (128). The main PLL (102) includes a phase detector (112), two frequency dividers (108, 126), a loop filter (116), a notch filter (118), and a controlled oscillator (122). The tracker PLL (128) phase locks to the reference signal (110), and biases the notch filter (118) in order to maintain an accurate lock on the notch frequency which is proportional to the reference frequency. All circuits are integrated in the same monolithic device in order to track parametric tolerances such as transconductances of the operational transconductance devices included in the tracker PLL (128) and the notch filter (118).

REFERENCES:
patent: 4167711 (1979-09-01), Smoot
patent: 4528522 (1985-07-01), Matsuura
patent: 4691176 (1987-09-01), Hsiung et al.
patent: 5270669 (1993-12-01), Jokura
patent: 5281930 (1994-01-01), Taromaru et al.
Motorola, Inc., "Suppress phase-lock-loop sidebands without introducing instability," pp. 10-53 1991 AR254 #3.
Motorola, Inc., "MECL Integrated Circuits," pp. 7-79, 1983 Series D.
J. Hoyle and E. Sanchez-Sinencio, "Sinusoidal Quadrature OTA Oscillators," p. 60, Texas A&M Univeristy, Aug. 1984,Texas.
Randall L. Geiger and Edgar Sanchez-Sinencio, "Active Filter Design Using Operational Transconductance Amplifier: A Tutorial," p. 28, 1985, IEEE Circuits and Devices Magazine.

Affiliated with

Also associated with

Rating

Low-noise frequency synthesizer does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Low-noise frequency synthesizer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low-noise frequency synthesizer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1181662