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FM discriminator having low noise characteristics
| Details |
Inventors: Lance, Drew R.; Altstatt, John E.;
Assignee: California Microwave, Inc. (Sunnyvale, CA)
Primary Examiner: Kominski; John
Assistant Examiner:
Attorney, Agent or Firm: Boone, Schatzel, Hamrick & Knudsen
A low noise discriminator circuit having particular utility for use in determining the spectral purity characteristics of an rf signal source and comprising, in addition to standard discriminator components, a down-locked reference signal source including a voltage-controlled signal generator for developing a reference signal and a corresponding train of signal pulses, a stabilizing voltage-controlled oscillator which responds to the discriminator error signal and generates a stabilizing signal having a frequency at least an order of magnitude greater than the frequency of the reference signal, and a sampling phase detector which samples the stabilizing signal at the signal pulse frequency and develops a control signal which is fed through a feed-back loop to stabilize the reference signal generator. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to FIG.
1 of the drawing, there is shown a phase lock discriminator in accordance with a preferred embodiment of the present invention which includes a test signal input terminal 10, a phase detector 12, a down-locked reference source 14, a feed-back loop 16 including an amplifier 18 and a filter 20, and a pair of discriminator output terminals A and B.
Phase detector 12 compares the phase of the reference signal generated by reference source 14 to the phase of the test signal input at terminal 10.
Any resulting error signal developed by detector 12 at output 22 is amplified and filtered by feed-back loop 16 and then applied to the voltage control input 24 of reference source 14.
In the preferred embodiment, a double balanced mixer is used for the phase detector 12.
Detector 12 mixes the reference signal and the test signal input at terminal 10 from an apparatus to be evaluated, and develop an error signal proportional to any difference in phase between the respective signals.
The error signal developed by detector 12 is substantially linear with respect to the phase difference between the two signals so long as the difference does not exceed .
+-.
.
degree.
.
Amplified and unamplified output signals indicative of a particular dynamic characteristic of the apparatus generating the test signal may be taken at terminals A and B respectively.
If the apparatus under test is caused to experience calibrated signal deviation, the output developed at terminals A and B will indicate the spectral purity of the signal developed by that apparatus.
Reference source 14 is comprised of a voltage-controlled signal generator 25 which operates at the test signal frequency, a sampling phase detector 26, an oscillator 28 which operates at a frequency substantially higher than the test frequency, and a feed-back circuit 30 including an amplifier 32 and a low pass filter 34.
As illustrated in FIG.
2 of the drawing, signal generator 25 is typically comprised of a voltage-controlled oscillator 36 which generates a sinusoidal reference signal on line 37, and a pulse generator 38 which uses the output of oscillator 36 to develop a train of signal pulses on line 39
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