Frequency synthesizer with temperature compensation and frequency multiplication and method of providing the same
First Claim
1. A frequency synthesizer with temperature compensation and frequency multiplication, comprising:
- a temperature dependent frequency oscillator;
at least one frequency multiplication element, the element programmed to vary as a function of a temperature variation of the frequency oscillator and to vary as a function of a frequency multiplication factor;
at least one locked loop circuit chosen from the group consisting of a phase locked loop, a frequency locked loop and a delay locked loop; and
the oscillator and element being coupled to the locked loop circuit such that a temperature independent multiplied frequency is provided.
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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).
194 Citations
24 Claims
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1. A frequency synthesizer with temperature compensation and frequency multiplication, comprising:
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a temperature dependent frequency oscillator; at least one frequency multiplication element, the element programmed to vary as a function of a temperature variation of the frequency oscillator and to vary as a function of a frequency multiplication factor; at least one locked loop circuit chosen from the group consisting of a phase locked loop, a frequency locked loop and a delay locked loop; and the oscillator and element being coupled to the locked loop circuit such that a temperature independent multiplied frequency is provided. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. The frequency synthesizer with temperature compensation and frequency multiplication, comprising:
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a temperature dependent frequency oscillator; at least one multi-modulus frequency divider, the divider programmed to vary as a function of a temperature variation of the frequency oscillator and to vary as a function of a frequency multiplication factor; at least one phase locked loop including a phase detector being coupled to a loop filter which is coupled to a voltage controlled oscillator having an output, the output being coupled back to a first input of the phase detector through at least one feedback path, the oscillator being coupled to a second input of the phase detector through at least one signal path; a control circuit including a temperature sensor and a memory being coupled to a temperature compensation controller, the controller of the control circuit being coupled to the divider and for controlling the divider; and the divider being coupled to the phase locked loop such that a temperature independent multiplied output frequency is obtained. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method of temperature compensating and multiplying a frequency output in a frequency synthesizer, comprising the steps of:
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providing a temperature dependent frequency oscillator coupled to at least one frequency multiplication element being programmed to vary as a function of a temperature variation of the frequency oscillator and to vary as a function of a frequency multiplication factor; measuring an ambient temperature value in proximity to the oscillator; searching a lookup table for a predetermined temperature dependent control signal corresponding to the ambient temperature value and the frequency multiplication factor; and applying the control signal to the at least one frequency multiplication element such that a desired temperature compensated and multiplied output frequency is obtained from the synthesizer. - View Dependent Claims (24)
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Specification