US3739273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spectrum analyzer
Assignee: United States Department of the Army
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Filing: 1971-11-02
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Granted: 1973-06-12
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Expires: 1991-11-02
Abstract
Abstract This spectrum analyzer will measure phase as well as amplitude of the spectral components of a signal. This is done by measuring the phase difference between the spectral components which are separated by a fixed frequency. The input signal is mixed with a swept frequency of a local oscillator and the two components resulting therefrom are amplified and further mixed to obtain a frequency which is the difference of the two. This difference in frequency is measured by phase detectors so as to give a reading of the phase dispersion of the spectral components of the input signal.
Inventors
- 👤 J Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:56
CPC Classifications
G; G01; G01R; G01R23/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
146 words
A spectrum analyzer comprising a signal to be analyzed having line spectra; an oscillator having swept frequency output; a first mixer; said signal and the output of the oscillator being connected to said mixer so as to be mixed thereby and to produce first and second frequency outputs combined; first and second amplifiers; said amplifiers each connected to said mixer and passing respectively one of the first and second frequency outputs; a second mixer having inputs connected to outputs of said amplifiers so as to produce a third frequency output which is the difference of said first and second frequencies; reference frequency means having a frequency equal to said third frequency output and being phase related to said signal to be analyzed; and phase detector connected to said reference frequency and to the output of said second mixer so as to detect the phase difference therebetween.
Claim 2
Dependent Claim
146 words
A spectrum analyzer comprising a signal to be analyzed having line spectra; an oscillator having swept frequency output; a first mixer; said signal and the output of the oscillator being connected to said mixer so as to be mixed thereby and to produce first and second frequency outputs combined; first and second amplifiers; said amplifiers each connected to said mixer and passing respectively one of the first and second frequency outputs; a second mixer having inputs connected to outputs of said amplifiers so as to produce a third frequency output which is the difference of said first and second frequencies; reference frequency means having a frequency equal to said third frequency output and being phase related to said signal to be analyzed; and phase detector connected to said reference frequency and to the output of said second mixer so as to detect the phase difference therebetween.
Claim 3
Dependent Claim
77 words
An analyzer as set forth in claim 1, further comprising a third mixer having two inputs and an output; a frequency source having an output connected to one of the inputs of said third mixer; the output from said first mixer being connected to the other input of the third mixer so as to produce a fourth frequency at the output of said third mixer; and an amplitude detector connected to the output of said third mixer.
Claim 4
Dependent Claim
54 words
An analyzer as set forth in claim 2, further comprising a cathode ray tube device having a intensification circuit, said phase detector having an output connectEd to drive said cathode ray tube device; and an amplifier means connecting the output from said third mixer to the intensification circuit of said cathode ray tube device.
Claim 5
Dependent Claim
38 words
An analyzer as set forth in claim 3, wherein said signal to be analyzed contains line spectra and frequency modulation; said reference signal being a frequency modulated pulse; and said frequency source being a frequency modulated pulse source.
References Cited (Backward Citations)
US3074014A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |