Frequency synthesizer with temperature compensation and frequenc

Details Frequency synthesizer with temperature compensation and frequenc Frequency synthesizer with temperature compensation and frequenc

1996-04-22

1997-02-18

Mis, David

Oscillators

Frequency stabilization

Temperature or current responsive means in circuit

331 16, 331 18, 331 25, 455260, 327105, H03L 102, H03L 706, H03L 716, H03L 718

Patent

active

056044682

ABSTRACT:
A frequency synthesizer (200) with temperature compensation and frequently multiplication. The synthesizer (200) having a temperature uncompensated frequency oscillator (202) coupled to a phase locked loop (206) including at least one temperature compensating and frequency multiplication element (208). The element (208) preferably being a multi-modulus divider. The element (208) is programmed by a control circuit (210) to vary as a function of temperature and to vary as a function of a fractional frequency multiplication factor. The element (208) also may provide adjustment of the nominal frequency of the frequency oscillator (202). The frequency oscillator (202) and preferably all the elements of the synthesizer (200) are temperature compensated by the element (208) to produce a temperature stable multiplied output frequency (238).

REFERENCES:
patent: 4454483 (1984-06-01), Baylor
patent: 4644297 (1987-02-01), Olds
patent: 5126699 (1992-06-01), Kabler
patent: 5216389 (1993-06-01), Carralero et al.
patent: 5355098 (1994-10-01), Iwasaki
patent: 5477194 (1995-12-01), Nagakura
patent: 5485127 (1996-01-01), Bertoluzzi et al.
"Performance Tests on an MCXO Combining ASIC and Hybrid Construction," 45th Annual Symposium on Frequency Control, 1991, IEEE. Benjaminson et al. Issued 1991 pp. 393-397.

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