Programmable frequency synthesizer
AssigneeAnalog Devices, Inc.
InventorRobert M. Clarke
Life of this patent
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Abstract
A programmable frequency synthesizer including a voltage-controlled oscillator, a regenerative frequency divider and a programmable integer divider, that provides wideband frequency coverage from a single narrowband oscillator. The voltage-controlled oscillator may generate a first signal having a first frequency. The regenerative frequency divider is coupled to the voltage-controlled oscillator and receives the first signal and performs a fractional multiplication of the first frequency of the first signal to provide a second signal a having a second frequency. The programmable integer divider is coupled to the regenerative frequency divider, and receives the second signal and divides the second frequency by a predetermined integer to provide a third signal having a third frequency.
Claims24
A programmable frequency synthesizer comprising
- a voltage-controlled oscillator that provides a first signal;
- a regenerative frequency divider coupled to the voltage-controlled oscillator that receives the first signal and performs a fractional multiplication of a first frequency of the first signal to provide a second signal having a second frequency;
- and
- a programmable integer divider, coupled to the regenerative frequency divider, that receives the second signal and divides the second frequency by a predetermined integer to provide a third signal having a third frequency.
A tunable receiver operable over a wide frequency band, the receiver comprising:
- a programmable frequency synthesizer including a voltage-controlled oscillator, and adapted to generate an output signal having a frequency derived from a combination of the voltage-controlled oscillator, a regenerative frequency divider and a programmable integer divider;
- a phase-locked loop coupled to the programmable frequency synthesizer to tune an operating frequency of the voltage-controlled oscillator, and
- a loop filter coupled to an output of the phase-locked loop and to an input of the programmable frequency synthesizer.
A method for synthesizing an output signal having an output frequency range, the method comprising acts of:
- generating, with an oscillator, a first signal having a first frequency range;
- performing a fractional multiplication of the first frequency range of the first signal to provide a second signal having a second frequency range;
- and
- dividing the second frequency range with an integer divider to obtain the output signal having the output frequency range;
- wherein the output frequency range is larger than the first frequency range.
A programmable frequency synthesizer comprising:
- a voltage-controlled oscillator to generate a first signal having a first frequency range;
- means for synthesizing, from the first signal, an output signal having an output frequency range that is larger than the first frequency range, said means being adapted to receive the first signal from the voltage-controlled oscillator.
Dependencies are inferred from the claim text.