FREQUENCY SYNTHESIZER WITH TEMPERATURE COMPENSATION AND FREQUENCY MULTIPLICATION AND METHOD OF PROVIDING THE SAME

摘要

PURPOSE: A Temperature compensated frequency oscillator is provided for using a PLL frequency synthesizer which does not need tunable reactive elements, provides a temperature-dependent frequency multiplying element whereby temperature compensation of the crystal oscillator and other circuit elements in the frequency synthesizer. CONSTITUTION: A synthesizer(200) comprising a temperature uncompensated frequency oscillator(202) coupled to a phase locked loop(206) including at least one temperature compensating and frequency multiplication element(208). An element(208) preferably being a multi-modulus divider. An 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. A frequency oscillator(202) and all the elements of a synthesizer(200) are temperature compensated by a element(208) to produce a temperature stable multiplied output frequency(238).