US3699461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Analog harmonic rejecting phase detector
Assignee: Collins Radio Co
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Filing: 1971-09-27
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Granted: 1972-10-17
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Expires: 1991-09-27
Abstract
Abstract An analog harmonic rejecting phase detector with even harmonic rejection achieved through a fundamental frequency, fr, phase detector section and rejection of the stronger odd harmonic signal content passed from the input signal through the fundamental frequency section. It includes a plurality of odd harmonic frequency phase detector sections such as 3fr, 5fr and possibly other odd harmonic sections up to and including a (2n 1)fr odd harmonic section. The reference signals 3fr, 5fr, etc., are square waves so phase related relative to fr as to achieve mutual cancelling with like harmonic content in the signal being passed through an invert-noninvert amplifier of the fundamental frequency section and passed to a summing amplifier. This requires an attenuator circuit after an invert-noninvert amplifier in each odd harmonic section to properly balance signal strength to the strengths of their respective counterparts passed through the fundamental frequency section. The resulting output of the summing amplifier is so integrated through a low pass filter as to present a plus or minus output voltage indicative of the input signal, fin, phase lead or lag and the magnitude of phase displacement relative to the square wave reference signal fr.
Inventors
- 👤 Dean P Huntsinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:26
CPC Classifications
G; G01; G01R; G01R25/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
154 words
In an analog harmonic phase detector, a fundamental frequency phase detector section including a first invert-noniNvert amplifier connectable for receiving a fundamental frequency (fin) from a frequency source, and connected for receiving a square wave input reference signal (fr); square wave reference frequency fr generating means; odd harmonic, relative to the fundamental frequency of the phase detector, phase detector odd harmonic section means including at least a 3fr odd harmonic frequency phase detector section having a second invert-noninvert amplifier connectable for receiving fin and connected for receiving a 3fr square wave signal; said square wave reference frequency fr generating means being also the source for the 3fr square wave signal; summing amplifier means circuit means signal input connected to the signal outputs of said first and second invertnoninvert amplifiers; and low pass signal integrating means connected to receive the output of said summing amplifier means and output connectable to phase detected signal utilizing circuitry.
Claim 2
Dependent Claim
154 words
In an analog harmonic phase detector, a fundamental frequency phase detector section including a first invert-noniNvert amplifier connectable for receiving a fundamental frequency (fin) from a frequency source, and connected for receiving a square wave input reference signal (fr); square wave reference frequency fr generating means; odd harmonic, relative to the fundamental frequency of the phase detector, phase detector odd harmonic section means including at least a 3fr odd harmonic frequency phase detector section having a second invert-noninvert amplifier connectable for receiving fin and connected for receiving a 3fr square wave signal; said square wave reference frequency fr generating means being also the source for the 3fr square wave signal; summing amplifier means circuit means signal input connected to the signal outputs of said first and second invertnoninvert amplifiers; and low pass signal integrating means connected to receive the output of said summing amplifier means and output connectable to phase detected signal utilizing circuitry.
Claim 3
Dependent Claim
109 words
The analog harmonic phase detector of claim 1, wherein said phase detector odd harmonic section means includes a plurality of successively higher odd harmonic phase detector sections including said 3fr odd harmonic phase detector section; a plurality of invert-noninvert amplifiers, one for each of said plurality of successively higher odd harmonic phase detector sections; and reference frequency generating means having a plurality of square wave outputs including said square wave reference frequency fr and successively higher odd harmonic square wave signals, starting with the 3fr odd harmonic reference signal, each connected as a controlling reference signal input for respective invert-noninvert amplifiers of the individual odd harmonic phase detector sections.
Claim 4
Dependent Claim
38 words
The analog harmonic phase detector of claim 2, wherein signal attenuating means is provided in the circuit interconnect means interconnecting the invert-noninvert amplifier of each odd harmonic phase detector section and an input of said summing amplifier means.
Claim 5
Dependent Claim
34 words
The analog harmonic phase detector of claim 3, wherein attenuating means attenuation factors are graduated factors successively from the first odd harmonic phase detector section upward through the higher odd harmonic phase detector sections.
Claim 6
Dependent Claim
47 words
The analog harmonic phase detector of claim 4, wherein said square wave odd harmonic reference signals and the square wave reference frequency fr are phase controlled for mutual cancellation, respectively, of like harmonic signal content passed through said fundamental frequency phase detector section to said summing amplifier.
Claim 7
Dependent Claim
90 words
The analog harmonic phase detector of claim 5, wherein said reference frequency square wave signal generating means includes, a driving frequency source; a reference divider driven by said driving frequency source and having a plurality of individual square wave signal output connections for the fr, 3fr and successive higher odd frequency reference signals used for the phase detector; and reference square wave signal phase control means with said reference frequency square wave signal generating means phasing said fr and the odd harmonic square wave reference signals for odd harmonic rejection.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |