US3622904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching circuits
Assignee: Allard Way Holdings Ltd
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Filing: 1969-11-03
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Granted: 1971-11-23
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Expires: 1989-11-03
Abstract
Abstract A switching circuit has an output resistance and a dummy output resistance, two switches respectively associated with the output resistances and an amplifier and dual feedback resistances respectively associated with the switches. The feedback resistances, switches and output resistances are such that a substantially unvarying current flows in the output of the amplifier either to the output or dummy output resistance depending on the switching states of the switches. As a result, the amplifier does not introduce any lag into the operation of the switching circuit.
Inventors
- 👤 Peter Michael Knight
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:14
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/72
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
A switching circuit which comprises: a signal amplifier device; an input impedance for the amplifier; a first output resistance connected to an output line; a first switch connected between the amplifier output and the output resistance and operable to connect the amplifier output to the output line via the first output resistance; a resistive feedback path extending from the junction between the first switch and the first output resistance to the junction between the input impedance and the amplifier device; a dummy output resistance; a second switch connected between the output of the amplifier device and the dummy output resistance and operable to connect said dummy output resistance across the amplifIer output; a resistive dummy feedback path extending from the junction between said second switch and the dummy output resistance to the junction between the amplifier device and the input impedance; and circuitry for controlling the switches so that when one switch is closed the other is open.
Claim 2
Dependent Claim
158 words
A switching circuit which comprises: a signal amplifier device; an input impedance for the amplifier; a first output resistance connected to an output line; a first switch connected between the amplifier output and the output resistance and operable to connect the amplifier output to the output line via the first output resistance; a resistive feedback path extending from the junction between the first switch and the first output resistance to the junction between the input impedance and the amplifier device; a dummy output resistance; a second switch connected between the output of the amplifier device and the dummy output resistance and operable to connect said dummy output resistance across the amplifIer output; a resistive dummy feedback path extending from the junction between said second switch and the dummy output resistance to the junction between the amplifier device and the input impedance; and circuitry for controlling the switches so that when one switch is closed the other is open.
References Cited (Backward Citations)
US3346697A
Cited
US3516002A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |