US4513178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal processing arrangement
Assignee: Motorola Solutions Inc
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Filing: 1983-04-18
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Granted: 1985-04-23
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Expires: 2003-04-18
Abstract
Abstract The invention relates to a signal processing arrangement which in a preferred form is part of a telephone speech circuit. The circuit arrangement includes an operational amplifier for processing signals coupled to an input terminal via a capacitor. In order to control output current provided by the arrangement a current is coupled to the input terminal of the amplifier which is fed with the signals to be amplified and an equal and opposite current is fed to the opposite side of the capacitor so that the effects of any unwanted A.C. components in the control current may be reduced. The use of the circuit allows a single capacitor to perform multiple functions thereby reducing the number of capacitors and the number of terminal pins of an integrated circuit package incorporating the circuit. The invention is particularly suitable for use in a telephone speech circuit.
Inventors
- 👤 Sam A. Hing
- 👤 Michel Guillien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:57
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/738; H04M1/76
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
52 words
A signal processing arrangement comprising: an operational amplifier having a first input terminal for receiving a reference potential, a second input terminal, and an output terminal; negative feedback means coupled between the output terminal of the amplifier and the second input terminal; a further input terminal for receiving signals to be processed;
Claim 2
Dependent Claim
52 words
A signal processing arrangement comprising: an operational amplifier having a first input terminal for receiving a reference potential, a second input terminal, and an output terminal; negative feedback means coupled between the output terminal of the amplifier and the second input terminal; a further input terminal for receiving signals to be processed;
Claim 3
Dependent Claim
44 words
capacitive means coupled between the further input terminal and the second input terminal of the amplifier; and means for coupling a predetermined control current to the second input terminal of the amplifier and as an equal and opposite current to the further input terminal;
Claim 4
Dependent Claim
44 words
capacitive means coupled between the further input terminal and the second input terminal of the amplifier; and means for coupling a predetermined control current to the second input terminal of the amplifier and as an equal and opposite current to the further input terminal;
Claim 5
Dependent Claim
40 words
whereby an output current of the signal processing arrangement derived from the output terminal of the operational amplifier is regulated in accordance with the predetermined control current, and the effects of unwanted A.C. components in the predetermined control current reduced.
Claim 6
Dependent Claim
40 words
whereby an output current of the signal processing arrangement derived from the output terminal of the operational amplifier is regulated in accordance with the predetermined control current, and the effects of unwanted A.C. components in the predetermined control current reduced.
Claim 7
Dependent Claim
23 words
The signal processing arrangement as claimed in claim 1, wherein the means for coupling the predetermined current comprises a current steering circuit arrangement.
Claim 8
Dependent Claim
20 words
The signal processing arrangement as claimed in claim 2, wherein the current steering circuit arrangement is a current mirror circuit.
Claim 9
Dependent Claim
18 words
The signal processing arrangement as claimed in claim 1 wherein the negative feedback means includes current feedback means.
Claim 10
Dependent Claim
18 words
The signal processing arrangement as claimed in claim 2 wherein the negative feedback means includes current feedback means.
Claim 11
Dependent Claim
18 words
The signal processing arrangement as claimed in claim 3 wherein the negative feedback means includes current feedback means.
Claim 12
Dependent Claim
50 words
The signal processing arrangement as claimed in claim 4, wherein the current feedback means comprises a transistor having a base electrode coupled to the output terminal of the amplifier, an emitter electrode coupled to a reference potential and a collector electrode coupled to the second input terminal of the amplifier.
Claim 13
Dependent Claim
50 words
The signal processing arrangement as claimed in claim 5, wherein the current feedback means comprises a transistor having a base electrode coupled to the output terminal of the amplifier, an emitter electrode coupled to a reference potential and a collector electrode coupled to the second input terminal of the amplifier.
Claim 14
Dependent Claim
50 words
The signal processing arrangement as claimed in claim 6, wherein the current feedback means comprises a transistor having a base electrode coupled to the output terminal of the amplifier, an emitter electrode coupled to a reference potential and a collector electrode coupled to the second input terminal of the amplifier.
Claim 15
Dependent Claim
18 words
The signal processing arrangement as claimed in claim 1 wherein the negative feedback means includes voltage feedback means.
Claim 16
Dependent Claim
18 words
The signal processing arrangement as claimed in claim 2, wherein the negative feedback means includes voltage feedback means.
Claim 17
Dependent Claim
18 words
The signal processing arrangement as claimed in claim 3, wherein the negative feedback means includes voltage feedback means.
Claim 18
Dependent Claim
50 words
The signal processing arrangement as claimed in claim 10, wherein the voltage feedback means comprises a transistor having a base electrode coupled to the output terminal of the amplifier, an emitter electrode coupled to a reference potential and a collector electrode connected by resistive means to the further input terminal.
Claim 19
Dependent Claim
50 words
The signal processing arrangement as claimed in claim 11, wherein the voltage feedback means comprises a transistor having a base electrode coupled to the output terminal of the amplifier, an emitter electrode coupled to a reference potential and a collector electrode connected by resistive means to the further input terminal.
Claim 20
Dependent Claim
50 words
The signal processing arrangement as claimed in claim 12, wherein the voltage feedback means comprises a transistor having a base electrode coupled to the output terminal of the amplifier, an emitter electrode coupled to a reference potential and a collector electrode connected by resistive means to the further input terminal.
Claim 21
Dependent Claim
37 words
The signal processing arrangement as claimed in claim 1 wherein the operational amplifier is a programmable operational amplifier which may be turned on in response to a programming current fed to a programming input of the amplifier.
Claim 22
Dependent Claim
37 words
The signal processing arrangement as claimed in claim 7 wherein the operational amplifier is a programmable operational amplifier which may be turned on in response to a programming current fed to a programming input of the amplifier.
Claim 23
Dependent Claim
37 words
The signal processing arrangement as claimed in claim 8 wherein the operational amplifier is a programmable operational amplifier which may be turned on in response to a programming current fed to a programming input of the amplifier.
Claim 24
Dependent Claim
37 words
The signal processing arrangement as claimed in claim 9 wherein the operational amplifier is a porgammable operational amplifier which may be turned on in response to a programming current fed to a programming input of the amplifier.
Claim 25
Dependent Claim
41 words
The signal processing arrangement as claimed in claim 16, wherein the programming current is derived from the output of a comparator arranged to compare a potential representative of the state of charge of the said capacitive means with a reference potential.
Claim 26
Dependent Claim
17 words
The signal processing arrangement as claimed in claim 1 and forming part of a telephone speech circuit.
Claim 27
Dependent Claim
15 words
The signal processing arrangement as claimed in claim 1 and fabricated as an integrated circuit.
References Cited (Backward Citations)
US4414434A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-22 | 1988-10-22 | 1989-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-22 | 1992-10-22 | 1993-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-22 | 1996-10-22 | 1997-04-23 | $7700.00 | Window Closed / Lapsed |