US4845445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplifier
Assignee: Telefunken Electronic GmbH
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Filing: 1987-12-30
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Granted: 1989-07-04
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Expires: 2007-12-30
Abstract
Abstract In an amplifier comprising an amplifier transistor and a tunable selection circuit with a coil, a further coil is arranged between the collector of the amplifier transistor and the supply voltage source and is inductively coupled with the coil of the tunable selection circuit.
Inventors
- 👤 Heinz Rinderle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:03
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/189; H03F3/19; H03F3/191; H03J; H03J3/00; H03J3/02; H03J3/16; H03J3/18; H03J3/185
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
99 words
An amplifier comprising: an amplifier transistor and a tunable selection circuit with a coil, wherein a signal from a collector of the amplifier transistor is fed to the selection circuit via a capacitor and wherein a further coil is arranged between the collector of the amplifier transistor and a supply voltage source and is inductively coupled with the coil of the tunable selection circuit, whereby said coupling of said coils controls the direction of a desired portion of said supply voltage to said transistor collector and the direction of a desired portion of said signal to said tuner coil.
Claim 2
Dependent Claim
99 words
An amplifier comprising: an amplifier transistor and a tunable selection circuit with a coil, wherein a signal from a collector of the amplifier transistor is fed to the selection circuit via a capacitor and wherein a further coil is arranged between the collector of the amplifier transistor and a supply voltage source and is inductively coupled with the coil of the tunable selection circuit, whereby said coupling of said coils controls the direction of a desired portion of said supply voltage to said transistor collector and the direction of a desired portion of said signal to said tuner coil.
Claim 3
Dependent Claim
141 words
An amplifier comprising: an amplifier transistor and a tunable selection circuit with a coil, wherein a signal from a collector of the amplifier transistor is fed to the selection circuit via a capacitor and wherein a further coil is arranged between the collector of the amplifier transistor and a supply voltage source and is inductively coupled with the coil of the tunable selection circuit; and wherein the number of windings and the coupling degree of the coil coupled with the coil of the tunable selection circuit are so selected that the component of a signal collector current of the amplifier transistor flowing through the coil coupled with the coil of the tunable selection circuit is as small as possible and the component of the collector current of the amplifier transistor flowing to the tunable selection circuit is as large as possible.
Claim 4
Dependent Claim
141 words
An amplifier comprising: an amplifier transistor and a tunable selection circuit with a coil, wherein a signal from a collector of the amplifier transistor is fed to the selection circuit via a capacitor and wherein a further coil is arranged between the collector of the amplifier transistor and a supply voltage source and is inductively coupled with the coil of the tunable selection circuit; and wherein the number of windings and the coupling degree of the coil coupled with the coil of the tunable selection circuit are so selected that the component of a signal collector current of the amplifier transistor flowing through the coil coupled with the coil of the tunable selection circuit is as small as possible and the component of the collector current of the amplifier transistor flowing to the tunable selection circuit is as large as possible.
Claim 5
Dependent Claim
103 words
An amplifier comprising: an amplifier transistor and a tunable selection circuit with a coil, wherein a signal from a collector of the amplifier transistor is fed to the selection circuit via a capacitor and wherein a further coil is arranged between the collector of the amplifier transistor and a supply voltage source and is inductively coupled with the coil of the tunable selection circuit; and wherein the coil coupled with the coil of the tunable selection circuit is poled in such a way that a signal current which flows through it and to whose frequency an output circuit is tuned is a minimum.
Claim 6
Dependent Claim
103 words
An amplifier comprising: an amplifier transistor and a tunable selection circuit with a coil, wherein a signal from a collector of the amplifier transistor is fed to the selection circuit via a capacitor and wherein a further coil is arranged between the collector of the amplifier transistor and a supply voltage source and is inductively coupled with the coil of the tunable selection circuit; and wherein the coil coupled with the coil of the tunable selection circuit is poled in such a way that a signal current which flows through it and to whose frequency an output circuit is tuned is a minimum.
Claim 7
Dependent Claim
120 words
An amplifier comprising: an amplifier transistor and a tunable selection circuit with a coil, wherein a signal from a collector of the amplifier transistor is fed to the selection circuit via a capacitor and wherein a further coil is arranged between the collector of the amplifier transistor and a supply voltage source and is inductively coupled with the coil of the tunable selection circuit; and wherein the tunable selection circuit comprises two variable capacitance diodes or a corresponding variable capacitance twin diode and there is arranged between these two variable capacitance diodes and a reference point a capacitor whose capacitance is so selected that the gain characteristic of the amplifier exhibits a minimum in the range of an image frequency.
Claim 8
Dependent Claim
120 words
An amplifier comprising: an amplifier transistor and a tunable selection circuit with a coil, wherein a signal from a collector of the amplifier transistor is fed to the selection circuit via a capacitor and wherein a further coil is arranged between the collector of the amplifier transistor and a supply voltage source and is inductively coupled with the coil of the tunable selection circuit; and wherein the tunable selection circuit comprises two variable capacitance diodes or a corresponding variable capacitance twin diode and there is arranged between these two variable capacitance diodes and a reference point a capacitor whose capacitance is so selected that the gain characteristic of the amplifier exhibits a minimum in the range of an image frequency.
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) | 1992-07-03 | 1993-01-02 | 1993-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-03 | 1997-01-02 | 1997-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-03 | 2001-01-02 | 2001-07-04 | $7700.00 | Window Closed / Lapsed |