Claims
- 1. A channelized radio synthesizer comprising, in combination:
- a. phase-lock loop means for locking to any one of a plurality of carrier frequencies, said phase-lock loop means comprising;
- a voltage controlled oscillator for producing a preselected desired output carrier frequency corresponding to any one of a first plurality of harmonics of a reference signal;
- a summer connected to apply to said voltage controlled oscillator a voltage summed from a first voltage and a second voltage;
- a loop filter for producing said first voltage to be applied to said summer;
- means for producing a first plurality of harmonics of a reference signal;
- a sampling phase detector connected in circuit between the voltage controlled oscillator output and the phase loop filter input for receiving a harmonic of said first plurality of harmonics;
- b. harmonic identification means comprising;
- means for producing a second plurality of harmonics of a second signal offset in frequency slightly from said reference signal;
- a mixer with an input signal combination of the preselected desired output carrier frequency and a harmonic from said second plurality of harmonics, and an output signal corresponding to the difference frequency between said input signal combination;
- counter means for producing a difference measurement signal representative of said difference frequency;
- c. a microprocessor connected to receive said difference measurement signal from said counter means and the output of said sampling phase detector; and
- d. a digital to analog converter having an input connected to the output of the microprocessor for providing said second voltage and connected to apply said second voltage to said summer,
- said second voltage having a magnitude effective to change the output frequency of said voltage controlled oscillator in a direction towards said preselected desired output.
- 2. A channelized radio synthesizer in accordance with claim 1 wherein:
- said harmonic identification means is operational only until said phase-lock loop means is locked to the preselected desired frequency.
- 3. A channelized radio synthesizer in accordance with claim 2 wherein said means for producing a first plurality of harmonics comprises:
- a first step-recovery diode.
- 4. A channelized radio synthesizer in accordance with claim 3 wherein said means for producing a second plurality of harmonics comprises:
- a second step-recovery diode.
- 5. A channelized radio synthesizer in accordance with claim 1 wherein said means for producing a second plurality of harmonics comprises:
- a first step-recovery diode.
- 6. A channelized radio synthesizer in accordance with claim 5 wherein said means for producing a second plurality of harmonics comprises:
- a second step-recovery diode.
Government Interests
The Government has rights in this invention pursuant to Contract No. DAAB07-78-C-9052 awarded by the Department of the Army.
US Referenced Citations (5)