Patent US381778A successfully refreshed from Google Patents.
Patent US3714589A successfully refreshed from Google Patents.
US3714589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digitally controlled phase shifter
Assignee: Individual
•
Filing: 1971-12-01
•
Granted: 1973-01-30
•
Expires: 1991-12-01
Abstract
Abstract Disclosed is a digitally controlled phase shifter which utilizes a phase locked loop to provide a closed loop system for the determination of phase shift. The phase shift at the output is controlled in arbitrarily small increments by adjustment of the division ratio of a digitally controlled variable counter.
Inventors
- 👤 R Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:56
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/06; H03L7/08; H03L7/081
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
137 words
A digitally controlled phase shifter comprising: a phase detector having as a first input a signal to be phase shifted; means connecting the output of said phase detector to the input of a voltage controlled oscillator; means connecting the output of said voltage controlled oscillator to the input of a divider; means connecting the output of said divider as the first of two inputs to a bistable device; means connecting the output of said flip-flop and the output of said variable controlled oscillator as the two inputs of an AND gate; means connecting the output of said AND gate to a variable counter; means connecting the output of said variable counter as the second input of said bistable device; and means for connecting the output of said bistable device as a second input to said phase detector.
Claim 2
Dependent Claim
137 words
A digitally controlled phase shifter comprising: a phase detector having as a first input a signal to be phase shifted; means connecting the output of said phase detector to the input of a voltage controlled oscillator; means connecting the output of said voltage controlled oscillator to the input of a divider; means connecting the output of said divider as the first of two inputs to a bistable device; means connecting the output of said flip-flop and the output of said variable controlled oscillator as the two inputs of an AND gate; means connecting the output of said AND gate to a variable counter; means connecting the output of said variable counter as the second input of said bistable device; and means for connecting the output of said bistable device as a second input to said phase detector.
Claim 3
Dependent Claim
137 words
A digitally controlled phase shifter comprising: a phase detector having as a first input a signal to be phase shifted; means connecting the output of said phase detector to the input of a voltage controlled oscillator; means connecting the output of said voltage controlled oscillator to the input of a divider; means connecting the output of said divider as the first of two inputs to a bistable device; means connecting the output of said flip-flop and the output of said variable controlled oscillator as the two inputs of an AND gate; means connecting the output of said AND gate to a variable counter; means connecting the output of said variable counter as the second input of said bistable device; and means for connecting the output of said bistable device as a second input to said phase detector.
Claim 4
Dependent Claim
137 words
A digitally controlled phase shifter comprising: a phase detector having as a first input a signal to be phase shifted; means connecting the output of said phase detector to the input of a voltage controlled oscillator; means connecting the output of said voltage controlled oscillator to the input of a divider; means connecting the output of said divider as the first of two inputs to a bistable device; means connecting the output of said flip-flop and the output of said variable controlled oscillator as the two inputs of an AND gate; means connecting the output of said AND gate to a variable counter; means connecting the output of said variable counter as the second input of said bistable device; and means for connecting the output of said bistable device as a second input to said phase detector.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |