US3852624A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase shifting network
Assignee: Motorola Solutions Inc
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Filing: 1973-09-07
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Granted: 1974-12-03
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Expires: 1993-09-07
Abstract
Abstract Variable direct current control phase shifting networks are connected to supply reference signals with predetermined phases relative to the synchronizing signal. An I axis demodulator of a color television receiver is utilized to sense a component of color along the I axis and shift the phase of the reference signals to change the phase shift amount when a component is present on the I axis.
Inventors
- 👤 C Marik
- 👤 B Shlachter
- 👤 W Slavik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:48
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/10; H03C3/24; H03C3/245; H04; H04N; H04N9/00; H04N9/64; H04N9/643
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
102 words
A control circuit comprising: a direct current voltage supply terminal; an impedance connected between an input and an output for providing a first phase shift in a signal applied to the input; a pair of oppositely poled diodes direct current connected in series circuit across said impedance; control means connected between the junction of said pair of diodes and said direct current voltage supply terminal for selectively applying a forward biasing electrical energy across said diodes; and said diodes altering the value of said impedance upon being forward biased to provide a second phase shift in a signal applied to the input.
Claim 2
Dependent Claim
102 words
A control circuit comprising: a direct current voltage supply terminal; an impedance connected between an input and an output for providing a first phase shift in a signal applied to the input; a pair of oppositely poled diodes direct current connected in series circuit across said impedance; control means connected between the junction of said pair of diodes and said direct current voltage supply terminal for selectively applying a forward biasing electrical energy across said diodes; and said diodes altering the value of said impedance upon being forward biased to provide a second phase shift in a signal applied to the input.
Claim 3
Dependent Claim
24 words
The combination according to claim 1 wherein said pair of oppositely poled diodes comprise the sole circuit components connected in series across said impedance.
Claim 4
Dependent Claim
27 words
The control circuit according to claim 1 wherein said control means for selectively applying a forward biasing electrical energy across said diodes comprises signal controlled circuit means.
Claim 5
Dependent Claim
60 words
The combination according to claim 3 wherein said signal controlled circuit means comprises a transistor, the collector-emitter path of which is connected in series circuit between the junction of said pair of diodes and said direct current voltage supply terminal, and the base of which is adapted for coupling with a control signal to vary the conductivity of said transistor.
Claim 6
Dependent Claim
24 words
A control circuit according to claim 4 further including means for applying a variable direct current bias potential to the base of said transistor.
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |