Patent US3221269A successfully refreshed from Google Patents.
US3221269A
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Time base circuits with dynamic bias
Assignee: BAE Systems Electronics Ltd
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Filing: 1961-11-17
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Granted: 1965-11-30
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Expires: 1981-11-17
Abstract
No abstract record available.
Inventors
- 👤 Davies Eric
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:55
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/60; H03K4/69; H03K4/72; H03K4/71
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A FREE RUNNING TIME BASE CIRCUIT COMPRISING AN INPUT STAGE HVING AN OUTPUT WHICH PRESENTS ALTERNATIVELY A HIGH IMPEDANCE AND A LOW IMPEDANCE IN ACCORDANCE WITH INPUT TIMING PULSES APPLIED THERETO; A CONDENSER CONNECTED ACROSS SAID OUTPUT TO BE DISCHARGED WHEN THE IMPEDANCE OF THE OUTPUT IS LOW; AN AMPLIFIER CONNECTED TO AMPLIFY THE VOLTAGE ACROSS SAID CONDENSER AND HAVING AN OUTPUT CIRCUIT; MEANS FOR APPLYING VOLTAGE PULSES PRODUCED IN SAID OUTPUT CIRCUIT AS POSITIVE FEEDBACK TO THE INPUT SIDE OF SAID INPUT STAGE; AND ALTERNATING CURRENT CONNECTION MEANS FOR FEEDING BACK, FROM SAID OUTPUT CIRCUIT TO THE INPUT SIDE OF SAID INPUT STAGE, BIAS CONTROL SIGNALS AT THE OPERATING FREQUENCY WHICH CONTROL THE BIAS OF THE INPUT STAGE AND PREVENT THE VOLTAGE ACROSS THE CONDENSER FROM RISING ABOVE A PREDETERMINED LEVEL WHICH IS BELOW THE LEVEL AT WHICH SATURATION OF THE AMPLIFIER OCCURS.
Claim 2
Dependent Claim
144 words
A FREE RUNNING TIME BASE CIRCUIT COMPRISING AN INPUT STAGE HVING AN OUTPUT WHICH PRESENTS ALTERNATIVELY A HIGH IMPEDANCE AND A LOW IMPEDANCE IN ACCORDANCE WITH INPUT TIMING PULSES APPLIED THERETO; A CONDENSER CONNECTED ACROSS SAID OUTPUT TO BE DISCHARGED WHEN THE IMPEDANCE OF THE OUTPUT IS LOW; AN AMPLIFIER CONNECTED TO AMPLIFY THE VOLTAGE ACROSS SAID CONDENSER AND HAVING AN OUTPUT CIRCUIT; MEANS FOR APPLYING VOLTAGE PULSES PRODUCED IN SAID OUTPUT CIRCUIT AS POSITIVE FEEDBACK TO THE INPUT SIDE OF SAID INPUT STAGE; AND ALTERNATING CURRENT CONNECTION MEANS FOR FEEDING BACK, FROM SAID OUTPUT CIRCUIT TO THE INPUT SIDE OF SAID INPUT STAGE, BIAS CONTROL SIGNALS AT THE OPERATING FREQUENCY WHICH CONTROL THE BIAS OF THE INPUT STAGE AND PREVENT THE VOLTAGE ACROSS THE CONDENSER FROM RISING ABOVE A PREDETERMINED LEVEL WHICH IS BELOW THE LEVEL AT WHICH SATURATION OF THE AMPLIFIER OCCURS.
References Cited (Backward Citations)
US2959745A
Cited
US2913625A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |