Patent US3621471A successfully refreshed from Google Patents.
US3621471A
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Resonant network with reactively coupled fet providing linear voltage/frequency response
Assignee: Wandel and Golterman GmbH and Co
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Filing: 1969-11-26
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Granted: 1971-11-16
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Expires: 1989-11-26
Abstract
Abstract A field-effect transistor with two gates has a resistance and a reactance serially connected across its drain and source, with one gate tied to the junction of these two impedances whereas the other gate has a modulating signal applied to it. The resistance may be constituted by the output circuit of a differential transistor amplifier having its input connected in parallel with drain and source of the field-effect transistor.
Inventors
- 👤 Rudolf Dick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:30
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/10; H03C3/24
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
85 words
A two-terminal impedance network comprising a pair of load terminals energizable by alternating current; a field-effect transistor with a source and a drain respectively connected to said terminals, said transistor having a first and a second gate electrode; a pair of impedances serially connected across said terminals, at least one of said impedances being predominantly reactive, said first gate electrode being connected to the junction of said impedances; and a supply of modulating signal connected between said second gate electrode and one of said terminals.
Claim 2
Dependent Claim
85 words
A two-terminal impedance network comprising a pair of load terminals energizable by alternating current; a field-effect transistor with a source and a drain respectively connected to said terminals, said transistor having a first and a second gate electrode; a pair of impedances serially connected across said terminals, at least one of said impedances being predominantly reactive, said first gate electrode being connected to the junction of said impedances; and a supply of modulating signal connected between said second gate electrode and one of said terminals.
Claim 3
Dependent Claim
16 words
A network as defined in claim 1 wherein said field-effect transistor is of the metal-oxide-semiconductor type.
Claim 4
Dependent Claim
15 words
A network as defined in claim 1 wherein one of said impedances is predominantly resistive.
Claim 5
Dependent Claim
28 words
A network as defined in claim 3 wherein said predominantly resistive impedance comprises an output circuit of an ancillary amplifier having an input circuit connected across said terminals.
Claim 6
Dependent Claim
17 words
A network as defined in claim 4 wherein said ancillary amplifier comprises two differentially connected transistor stages.
Claim 7
Dependent Claim
52 words
A network as defined in claim 5 wherein said stages each have a base, an emitter and a collector, said source and drain being connected across the base/collector circuit of one of said transistor stages, the other of said transistor stages having an emitter/collector circuit in series with said predominantly reactive impedance.
Claim 8
Dependent Claim
31 words
A circuit arrangement including a resonant circuit with a first reactive branch comprising a network as defined in claim 1 and a second, complementary reactive branch connected to said load terminals.
Claim 9
Dependent Claim
26 words
A circuit arrangement as defined in claim 7 wherein said predominantly reactive impedance is constructed and positioned to make the impedance of said network essentially inductive.
Claim 10
Dependent Claim
21 words
A circuit arrangement as defined in claim 8 wherein said second reactive branch comprises a condenser connected across said load terminals.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |