US3634775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistorized broadband amplifiers with gain control
Assignee: Siemens AG
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Filing: 1970-10-19
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Granted: 1972-01-11
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Expires: 1990-10-19
Abstract
Abstract A transistorized broadband amplifier having a gain control which includes attenuation elements coupled between transistor amplifier stages and which has a diode coupled from a point intermediate the attenuation elements to circuit ground. The output signal is coupled through the diode and to the midpoint of the attenuation elements thereby providing improved attenuation without introducing distortion or noise into the transistor amplifier circuits.
Inventors
- 👤 Wolfgang Ulmer
- 👤 Hermann Rausch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:26
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3036; H03G1/00; H03G1/0005; H03G1/0035; H03G1/0052
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
118 words
A broadband amplifier comprising: first and second transistors each having base, emitter and collector connections, means for coupling an input signal to said first transistor, and an output signal being present at said second transistor, first and second attenuation elements being coupled in a series path between said first and second transistors, means for coupling a portion of an output signal to a circuit point intermediate said first and second attenuation elements to provide amplification control, a diode coupled from said circuit point to circuit ground, a transformer being provided, and said first and second attenuation elements being coupled to the primary of said transformer with the secondary thereof being coupled to the input of said second transistor.
Claim 2
Dependent Claim
118 words
A broadband amplifier comprising: first and second transistors each having base, emitter and collector connections, means for coupling an input signal to said first transistor, and an output signal being present at said second transistor, first and second attenuation elements being coupled in a series path between said first and second transistors, means for coupling a portion of an output signal to a circuit point intermediate said first and second attenuation elements to provide amplification control, a diode coupled from said circuit point to circuit ground, a transformer being provided, and said first and second attenuation elements being coupled to the primary of said transformer with the secondary thereof being coupled to the input of said second transistor.
Claim 3
Dependent Claim
21 words
A broadband amplifier in accordance with claim 1 wherein a second diode is coupled in antiparallel relation with said first-named diode.
Claim 4
Dependent Claim
21 words
A broadband amplifier in accordance with claim 1 wherein a second diode is coupled in sEries opposition with said first-named diode.
Claim 5
Dependent Claim
56 words
A broadband amplifier in accordance with claim 1 wherein a parallel capacitor and resistor are provided and wherein said diode is coupled to circuit ground through said parallel capacitor and resistor circuit and wherein said capacitor has a value to compensate for the lead inductance of said diode when the network is set at maximum attenuation.
Claim 6
Dependent Claim
34 words
An amplifier in accordance with claim 4 wherein said capacitor is adjusted for minimum attenuation distortion and wherein an additional adjustable trimmer capacitor is provided in parallel with the collector of said first transistor.
Claim 7
Dependent Claim
15 words
An amplifier in accordance with claim 1 wherein said transformer is a toroidal core transformer.
Claim 8
Dependent Claim
49 words
An amplifier in accordance with claim 1 wherein a series-resonant circuit is coupled to said transformer which, together with the stray capacitances and the stray inductances of the circuit, as well as with the input resistance of the following transistor, forms a filter which provides substantially flat transformer response.
Claim 9
Dependent Claim
73 words
An amplifier in accordance with claim 7 wherein the inductance L, resistance R, and capacitance C of the series-resonant circuit are selected as follows: R 0.9.W2.L2.u2 L 0.3.L2.u2 C 1/0.9.W2.R2.u2 wherein the translation ratio of the transformer is w2 and L2 and R2 are the inductance and resistance respectively of the transistor and the leakage inductance and capacitance of the circuit which form a parallel resonant circuit having a resonant frequency of W2.
Claim 10
Dependent Claim
68 words
An amplifier in accordance with claim 8 wherein a plurality of amplifier stages and regulation stages are provided in series and wherein in the application of a stepwise regulation, the regulating stages which lie closest to the input of the amplifier are controlled first from maximum amplification of the amplifier to approximately zero then in the same manner the successive regulating stages are controlled up to maximum amplification.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |