US3675124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring frequency modulation noise signals and for calibrating same
Assignee: SP-MICROWAVE Inc
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Filing: 1970-10-28
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Granted: 1972-07-04
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Expires: 1990-10-28
Abstract
Abstract Apparatus is provided for the measurement of frequency modulation noise on the carrier signal output of a low-noise, low-power, high-frequency diode oscillator under test. An auxiliary injection phase-locked oscillator, driven by the oscillator under test, is used to provide a signal of sufficient level for operation of a high-frequency discriminator used for noise measurement. The auxiliary oscillator may additionally be used for calibration of the discriminator preliminary to taking noise measurements.
Inventors
- 👤 James R Ashley
- 👤 Frank M Palka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:54
CPC Classifications
G; G01; G01R; G01R23/00; G01R23/02; G01R29/00; G01R29/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
193 words
Apparatus for measuring the frequency modulation noise characteristics of low-power oscillator means comprising: regulated power supply means for exciting said low-power oscillator means at a first power output level, auxiliary oscillator means operating at a second power output level, signal circulator means having first, second, and third port means, said low-power oscillator means being coupled to said first port means for supplying a phase locking signal at said second port means to said auxiliary oscillator means, said auxiliary oscillator means being adapted to supply through said second port means an output at said third port means, isolator means connected to said third port means and having output means, first power divider means coupled to said isolator output means and having first and second output means, balanced mixer means having first input means, second input means, and output means, reference channel circuit means coupling said first power divider first output means to said first input means of said balanced mixer means, signal channel circuit means coupling said first power divider second output means to said second input means of said balanced mixer means, and wave analyzer means connected to said balanced mixer output means.
Claim 2
Dependent Claim
193 words
Apparatus for measuring the frequency modulation noise characteristics of low-power oscillator means comprising: regulated power supply means for exciting said low-power oscillator means at a first power output level, auxiliary oscillator means operating at a second power output level, signal circulator means having first, second, and third port means, said low-power oscillator means being coupled to said first port means for supplying a phase locking signal at said second port means to said auxiliary oscillator means, said auxiliary oscillator means being adapted to supply through said second port means an output at said third port means, isolator means connected to said third port means and having output means, first power divider means coupled to said isolator output means and having first and second output means, balanced mixer means having first input means, second input means, and output means, reference channel circuit means coupling said first power divider first output means to said first input means of said balanced mixer means, signal channel circuit means coupling said first power divider second output means to said second input means of said balanced mixer means, and wave analyzer means connected to said balanced mixer output means.
Claim 3
Dependent Claim
57 words
Apparatus as described in claim 1 further comprising: adjustable-voltage calibration-modulator means for frequency modulating said auxiliary oscillator means in the absence of an output from said low-power oscillator means, and spectrum analyzer means coupled to the output of said first isolator means for observing the presence of a carrier null upon proper adjustment of said adjustable voltage.
Claim 4
Dependent Claim
23 words
Apparatus as described in claim 7 wherein said reference channel circuit means further comprises: attenuator means, adjustable phase shifter means, and isolator means.
Claim 5
Dependent Claim
41 words
Apparatus as described in claim 3 wherein said signal channel circuit means further comprises: second circulator means having first, second, and third port means second power divider means having first input means and first and second output means, and attenuator means.
Claim 6
Dependent Claim
81 words
Apparatus as described in claim 4 further comprising: tunable discriminator resonant cavity means having a coupling port, means for coupling said second output means of said first power divider means to said first port of said second circulator means, means for coupling said second port means of said second circulator means to said second power divider means, and means for coupling said discriminator cavity means through said discriminator cavity coupling port to said third port means of said second circulator means.
Claim 7
Dependent Claim
33 words
Apparatus as described in claim 5 further comprising: signal rectifier means coupled to said second output means of said second power divider means, and null indicator means coupled to said signal rectifier means.
References Cited (Backward Citations)
US3025467A
Cited
US3350643A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |