Patent US2461390A successfully refreshed from Google Patents.
Patent US3626425A successfully refreshed from Google Patents.
US3626425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic drive circuit
Assignee: SP-MICROWAVE Inc
•
Filing: 1970-03-19
•
Granted: 1971-12-07
•
Expires: 1990-03-19
Abstract
Abstract An electronic drive circuit for a microwave ferrite phase shifter includes a single output stage to drive the phase shifter to a specified level of magnetization of either polarity. Bistable circuits permit the output stage to magnetize the phase shifter in one polarity or the other in response to first or second command signals respectively. A signal indicative of the absolute value of the instantaneous voltage being applied to the phase shifter is integrated and compared to a reference voltage. When the integrated signal reaches a prescribed level, a monostable multivibrator is actuated and the magnetization current to the phase shifter is terminated.
Inventors
- 👤 Harry F Strenglein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:33
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/26; H01Q3/30; H01Q3/34; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/66; H03K17/661; H03K17/662; H03K17/663; H03K5/00; H03K5/13
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
136 words
A drive circuit for energizing a nonsaturating phase shifter comprising a normally balanced bridge, output terminals on said bridge for connecting an external phase shifter thereto, means to unbalance said bridge including first and second bistable circuits connected to be driven into their SET states in response to first and second command signals respectively, said bistable circuits being further connected to maintain said bridge in an unbalanced condition while the bistable circuit is in the SET state, means to produce an integrated signal indicative of the voltage-time integral of the voltage appearing across said output terminals in response to a command signal, and means to rebalance said bridge when the magnitude of the integrated signal exceeds a given threshold, said means to rebalance the bridge including means to drive both bistable circuits to the RESET state.
Claim 2
Dependent Claim
136 words
A drive circuit for energizing a nonsaturating phase shifter comprising a normally balanced bridge, output terminals on said bridge for connecting an external phase shifter thereto, means to unbalance said bridge including first and second bistable circuits connected to be driven into their SET states in response to first and second command signals respectively, said bistable circuits being further connected to maintain said bridge in an unbalanced condition while the bistable circuit is in the SET state, means to produce an integrated signal indicative of the voltage-time integral of the voltage appearing across said output terminals in response to a command signal, and means to rebalance said bridge when the magnitude of the integrated signal exceeds a given threshold, said means to rebalance the bridge including means to drive both bistable circuits to the RESET state.
Claim 3
Dependent Claim
46 words
The drive circuit of claim 1 wherein the means to produce an integrated signal includes a capacitor and a transistor connected to supply charging current to said capacitor, said transistor being biased in accordance with the absolute value of the voltage across said bridge output terminals.
Claim 4
Dependent Claim
77 words
The drive circuit of claim 1 wherein the means to rebalance the bridge includes a comparator circuit for comparing the magnitude of the integrated signal with a reference signal, said comparator further including means to produce a switching signal when the magnitude of the integrated signal approaches the magnitude of the reference signal, and wherein said means to drive the bistable circuits to the RESET state includes means to couple a switching signal to both bistable circuits.
Claim 5
Dependent Claim
59 words
The device of claim 3 wherein the means to couple the switching signal to both bistable circuits includes a monostable multivibrator arranged to be triggered into its quasi-stable state in response to a switching signal, said monostable multivibrator being further arranged to clamp said bistable circuits in their RESET state while the monostable multivibrator remains in the quasi-stable state.
Claim 6
Dependent Claim
24 words
The device of claim 2 further including shorting means for shorting out said capacitor when the monostable multivibrator is triggered into its quasi-stable state.
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) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |