US3743764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic phase shifting apparatus
Assignee: RCA Licensing Corp
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Filing: 1972-05-18
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Granted: 1973-07-03
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Expires: 1992-05-18
Abstract
Abstract An electronic phase shift circuit suitable for construction in integrated circuit form as a tint control or as an automatic frequency and phase control for a color oscillator, or the like. In the phase shift circuit, input signals are coupled via two signal paths to a signal adding or summing circuit. Predetermined but different phase shifts are provided in the two signal paths. Additionally, one signal path includes a differential control circuit responsive to applied control signals for varying the amplitude of signals coupled through that path. The resultant phase of the sum of the signals with respect to the phase of the input signals is variable according to the magnitude of applied control signals.
Inventors
- 👤 E Wittmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:21
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/30; H03B5/32; H03B5/36; H03B5/366; H03H; H03H11/00; H03H11/02; H03H11/16; H03H11/20; H04; H04N; H04N9/00; H04N9/44; H04N9/455
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
192 words
Electronic phase shifting apparatus comprising: a source of signals, amplifying means having first, second and third terminals, said first terminal being coupled to said source, said second terminal providing output signal replicas of signals coupled to said first terminal and at a first relative phase, said third terminal providing output signal replicas of signals at said first terminal and of substantially different phase from said signals at said second terminal, current splitting means coupled to said third terminal for dividing signal currents at said third terminal into tWo paths, said current splitting means including differential input terminals and at least one output terminal, a load impedance element coupled to said output terminal, a source of differential control signals means for coupling said differential control signals to said differential input terminals for controlling coupling of signal currents into said load impedance element; and a reactance element coupled between said second terminal of said amplifying means and said output terminal of said current splitting means whereby, signal currents from said reactance element are added to variable amplitude signal currents from said current splitting means, producing signals with phase responsive to said differential control signals.
Claim 2
Dependent Claim
192 words
Electronic phase shifting apparatus comprising: a source of signals, amplifying means having first, second and third terminals, said first terminal being coupled to said source, said second terminal providing output signal replicas of signals coupled to said first terminal and at a first relative phase, said third terminal providing output signal replicas of signals at said first terminal and of substantially different phase from said signals at said second terminal, current splitting means coupled to said third terminal for dividing signal currents at said third terminal into tWo paths, said current splitting means including differential input terminals and at least one output terminal, a load impedance element coupled to said output terminal, a source of differential control signals means for coupling said differential control signals to said differential input terminals for controlling coupling of signal currents into said load impedance element; and a reactance element coupled between said second terminal of said amplifying means and said output terminal of said current splitting means whereby, signal currents from said reactance element are added to variable amplitude signal currents from said current splitting means, producing signals with phase responsive to said differential control signals.
Claim 3
Dependent Claim
50 words
Electronic phase shifting apparatus according to claim 1 wherein: said amplifying means comprises at least one transistor having base, emitter and collector electrodes, corresponding to said first, second and third terminals respectively, said amplifying means providing at said emitter and collector electrodes replicas of signals supplied to said base electrode.
Claim 4
Dependent Claim
100 words
Electronic phase shifting apparatus according to claim 2 wherein: said current splitting means comprises at least first and second transistors each having emitter, base and collector electrodes, a common connection of said emitter electrodes, means coupling said common connection to said collector electrode of said amplifying means and thereby providing signals to said current splitting means, said load impedance element comprises a resistance coupled to said collector of said second transistor, and said source of differential control signals is coupled to said base electrodes of said first and second transistors for controlling the signal currents into said resistive load element.
Claim 5
Dependent Claim
52 words
Electronic phase shifting apparatus according to claim 3 wherein: said reactance element is a capacitive device having first and second terminals, said first terminal being coupled to said emitter electrode of said amplifying means, said second terminal being coupled to said collector electrode of said second transistor of said current splitting means.
Claim 6
Dependent Claim
36 words
Electronic phase shifting apparatus according to claim 4 wherein: said source of signals corresponds to a color reference oscillator providing continuous waves at a frequency corresponding to the color subcarrier component of a color television signal.
Claim 7
Dependent Claim
44 words
Electronic phase shifting apparatus according to claim 5 wherein: said source of differential control signals comprises a source of signals responsive to a phase difference between signals supplied to said amplifying means and a periodic burst signal component of a composite color television signal.
Claim 8
Dependent Claim
103 words
Electronic phase shifting apparatus according to claim 1 wherein: said current splitting means comprises at least first and second transistors each having emitter, base and collector electrodes, a common connection of said emitter electrodes, means coupling said common connection to said third terminal of said amplifying means and thereby providing signals to said current splitting means, said load impedance element comprises a resistance coupled to said collector of said second transistor, said source of differential control signals is coupled to said base electrode of at least one of said first and second transistors for controlling the signal current into said resistive load element.
Claim 9
Dependent Claim
52 words
Electronic phase shifting apparatus according to claim 7 wherein: said reactance element is a capacitive device having first and second terminals, said first terminal being coupled to said second terminal of said amplifying means, said second terminal being coupled to said collector electrode of said second transistor of said current splitting means.
Claim 10
Dependent Claim
44 words
Electronic phase shifting apparatus according to claim 8 wherein: said source of differential control signals comprises a source of signals responsive to a phase diFference between signals supplied to said amplifying means and a periodic burst signal component of a composite color television signal.
Claim 11
Dependent Claim
48 words
Electronic phase shifting apparatus according to claim 1 wherein: said reactance element is a capacitive device having first and second terminals, said first terminal being coupled to said second terminal of said amplifying means, said second terminal being coupled to said output terminal of said current splitting means.
Claim 12
Dependent Claim
56 words
Electronic phase shifting apparatus according to claim 2 wherein: said amplifying means comprises a transistor having emitter, base and collector electrodes, a resistive element coupled between said emitter electrode and a source of reference potential, whereby output signals of a first relevant phase are produced at the junction of said emitter electrode and said resistive element.
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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |