US3601708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency independent constant phase shift system
Assignee: Kollsman Instrument Corp
•
Filing: 1970-02-16
•
Granted: 1971-08-24
•
Expires: 1990-02-16
Abstract
Abstract The system provides phase alignment of a pair of frequency variable symmetrical pulsations of repetitive waveform having the same instantaneous frequency. Facility is described and illustrated for comparing the relative phase of the two-wave trains and for phase shifting one of the wave trains relative to the other. The phase shift is adjustable over a broad range and once the phase shift is set, the set remains constant and independent of changes in the frequency of the wave trains.
Inventors
- 👤 Samuel Stempler
- 👤 Carl A Listl
- 👤 Eugene L Boronow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:49
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/22; H03K5/26; H03L; H03L7/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
137 words
In a frequency-independent system for phase aligning a pair of frequency-variable symmetrical voltage wave trains having the same instantaneous frequency, means responsive to each voltage level transition of one of said trains for producing corresponding pulse signals in synchronism with each transition, resettable ramp generator means responsive to each said pulse signal for producing an output voltage ramp signal having a slope proportional to said instantaneous frequency, means for initiating a control signal when said ramp signal reaches a reference voltage level, means responsive to said control signal for resetting said ramp generator means, means responsive to successive control signals for producing a phase-shifted symmetrical output wave train having voltage level transistors synchronized with sAid control signals, and means for comparing the relative phase of the shifted output wave train with the other of said wave trains.
Claim 2
Dependent Claim
137 words
In a frequency-independent system for phase aligning a pair of frequency-variable symmetrical voltage wave trains having the same instantaneous frequency, means responsive to each voltage level transition of one of said trains for producing corresponding pulse signals in synchronism with each transition, resettable ramp generator means responsive to each said pulse signal for producing an output voltage ramp signal having a slope proportional to said instantaneous frequency, means for initiating a control signal when said ramp signal reaches a reference voltage level, means responsive to said control signal for resetting said ramp generator means, means responsive to successive control signals for producing a phase-shifted symmetrical output wave train having voltage level transistors synchronized with sAid control signals, and means for comparing the relative phase of the shifted output wave train with the other of said wave trains.
Claim 3
Dependent Claim
53 words
In a system in accordance with claim 1 wherein the last-named means includes means combining said shifted output wave train and the other of said wave trains to provide a pulse train having pulse widths proportional to the relative phase difference between said shifted output wave train and other of said wave trains.
Claim 4
Dependent Claim
41 words
In a system in accordance with claim 2 wherein said last-named means further includes means responsive to said pulse train for indicating the incidence of relative phase desynchronization of said shifted output wave train and said other of said wave trains.
Claim 5
Dependent Claim
25 words
In a system in accordance with claim 1 wherein said resettable ramp generator means comprises an integrator circuit means in combination with operation amplifier means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |