US5039887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for controlling the level of electrical signals
Assignee: KE Kommunikations Elektronik
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Filing: 1990-08-29
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Granted: 1991-08-13
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Expires: 2010-08-29
Abstract
Abstract For controlling the level of electrical signals a circuit arrangement is formed with two series connected amplifiers. A first amplifier containing a first variable resistor, operates at maximum amplification when a low input signal level is received. A second amplifier comprises a series connection of a second variable resistor and a current-controlled voltage source with two complementary outputs. The outputs of the voltage source are connected to a comparator and a controller with two separate outputs. One of the controller outputs transmits a control signal while the other output simultaneously transmits a blocking signal. A first output of the controller is connected with the first variable resistor, while a second output of the controller is connected to the second variable resistor.
Inventors
- 👤 Martin Brahms
- 👤 Andreas Hennig
- 👤 Andreas Timmermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:46
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3052; H03G3/3073
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
142 words
A circuit arrangement for controlling the level of electrical signals applied to an input, said arrangement comprising: a first amplifier connected to the input and including a first variable resistor, said first amplifier operating with maximum amplification at a low level of the signal applied to the input; a second amplifier connected in series with the first amplifier and including a second variable resistor and a current-controlled voltage source with two complementary outputs; a comparator connected to the outputs of the voltage source; and a controller connected to the outputs of the voltage source, said controller having two separate outputs, one of which transmits a controlling signal while the other simultaneously transmits a blocking signal, a first output of the controller being connected to the first variable resistor and a second output of the controller being connected to the second variable resistor.
Claim 2
Dependent Claim
142 words
A circuit arrangement for controlling the level of electrical signals applied to an input, said arrangement comprising: a first amplifier connected to the input and including a first variable resistor, said first amplifier operating with maximum amplification at a low level of the signal applied to the input; a second amplifier connected in series with the first amplifier and including a second variable resistor and a current-controlled voltage source with two complementary outputs; a comparator connected to the outputs of the voltage source; and a controller connected to the outputs of the voltage source, said controller having two separate outputs, one of which transmits a controlling signal while the other simultaneously transmits a blocking signal, a first output of the controller being connected to the first variable resistor and a second output of the controller being connected to the second variable resistor.
Claim 3
Dependent Claim
21 words
A circuit arrangement according to claim 1, additionally comprising an ohmic resistor connected in parallel with each of said variable resistors.
Claim 4
Dependent Claim
28 words
A circuit arrangement according to claim 1, wherein the variable resistors are field-effect transistors each having a control electrode connected to one of the outputs of the controller.
Claim 5
Dependent Claim
16 words
A circuit arrangement according to claim 1, wherein the current-controlled voltage source comprises a transimpedance amplifier.
Claim 6
Dependent Claim
20 words
A circuit arrangement according to claim 1, wherein the controller outputs provide voltage values of equal magnitude but opposite phase.
Claim 7
Dependent Claim
28 words
A circuit arrangement according to claim 2, wherein the variable resistors are field-effect transistors each having a control electrode connected to one of the outputs of the controller.
Claim 8
Dependent Claim
16 words
A circuit arrangement according to claim 2, wherein the current-controlled voltage source comprises a transimpedance amplifier.
Claim 9
Dependent Claim
16 words
A circuit arrangement according to claim 3, wherein the current-controlled voltage source comprises a transimpedance amplifier.
Claim 10
Dependent Claim
20 words
A circuit arrangement according to claim 2, wherein the controller outputs provide voltage values of equal magnitude but opposite phase.
Claim 11
Dependent Claim
20 words
A circuit arrangement according to claim 3, wherein the controller outputs provide voltage values of equal magnitude but opposite phase.
Claim 12
Dependent Claim
20 words
A circuit arrangement according to claim 4, wherein the controller outputs provide voltage values of equal magnitude but opposite phase.
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) | 1994-08-12 | 1995-02-11 | 1995-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-12 | 1999-02-11 | 1999-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-12 | 2003-02-11 | 2003-08-13 | $7700.00 | Window Closed / Lapsed |