Phase interpolated fractional-N frequency synthesizer with on-ch

Details Phase interpolated fractional-N frequency synthesizer with on-ch Phase interpolated fractional-N frequency synthesizer with on-ch

1998-07-01

2000-05-16

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

331 10, 331 18, 331 1A, 327158, 455260, H03L 7081, H03L 7087, H03L 718

Patent

active

060642726

ABSTRACT:
A phase interpolated frequency synthesizer with on chip tuning includes a voltage controlled oscillator, a fractional-N divider, phase compensation and on chip tuning circuits, a phase detector, and a loop filter. The phase compensation and on chip tuning circuits compensate for the phase lag from the fractional-N divider. The phase compensation circuit can include a series of voltage controlled delay elements with the tuning circuit providing a control voltage.

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National Semiconductor Advance Information "LMX2350/LMX2352 PLLatinum.TM. Fractional N RF / Integer N IF Dual Low Power Frequency Synthesizer," Feb. 1998, 18 pages.
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http://www.kabuki.eecs.berkeley.edu/rfl, "A Phase Interpolation Technique for Fractional-N Frequency Synthesis: Slides 3-21" Oct. 2, 1995, 18 pages.
Craninckx et al., "A 1.75-GHz/3-V Dual Modulus Divide-by-128/129 Prescaler in 0.7-.mu.m CMOS," IEEE Journal of Solid-State Circuits, vol. 31, No. 7, Jul. 1996, pp. 890-897.
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