Patent US3822385A successfully refreshed from Google Patents.
US3822385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise pulse rejection circuit
Assignee: Nortel Networks Technology Corp
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Filing: 1973-09-14
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Granted: 1974-07-02
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Expires: 1993-09-14
Abstract
Abstract A circuit for rejecting pulses having a width less than a predetermined amount uses a single amplifier. The pulses are fed to the amplifier through a resistance-capacitance charging circuit. The resistance element is shunted by a pair of switched low impedance circuits which are controlled by the output signal of the amplifier to selectively permit current flow through only one of the circuits.
Inventors
- 👤 I Kayalioglu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:27
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/01; H03K3/013; G; G01; G01R; G01R29/00; G01R29/02; G01R29/027; G01R29/0273; H03K3/02; H03K3/023; H03K3/0233; H03K3/02337
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
128 words
A pulse rejection circuit comprising: an input terminal for connection to a source of pulses; an operational amplifier having an output terminal, an inverting input, and a non-inverting input; a resistance element connected between the input terminal and said inverting input; a capacitance element having one end connected to said inverting input, and the other end connected to said non-inverting input and to an output port for connection to a source of reference potential; a pair of oppositely poled unidirectional current devices connected in parallel and across said resistance element; a pair of switch means, each one connected in series with a respective one of said devices, said switch means being responsive to the signal appearing on said output terminal for selectively permitting current flow through said devices.
Claim 2
Dependent Claim
128 words
A pulse rejection circuit comprising: an input terminal for connection to a source of pulses; an operational amplifier having an output terminal, an inverting input, and a non-inverting input; a resistance element connected between the input terminal and said inverting input; a capacitance element having one end connected to said inverting input, and the other end connected to said non-inverting input and to an output port for connection to a source of reference potential; a pair of oppositely poled unidirectional current devices connected in parallel and across said resistance element; a pair of switch means, each one connected in series with a respective one of said devices, said switch means being responsive to the signal appearing on said output terminal for selectively permitting current flow through said devices.
Claim 3
Dependent Claim
14 words
A circuit as defined in claim 1 wherein said unidirectional current devices are diodes.
Claim 4
Dependent Claim
14 words
A circuit as defined in claim 2 wherein said switch means are bipolar transistors.
Claim 5
Dependent Claim
127 words
A pulse rejection circuit comprising: an input terminal for connection to a source of pulses; an operational amplifier having an output terminal, an inverting input, and a non-inverting input; a resistance element connected between the input terminal and said inverting input; a capacitance element having one end connected to said inverting input, and the other end connected to said non-inverting input and to an output port for connection to a source of reference potential; a pair of opposite type bipolar transistors having their base electrodeS connected to said output terminal, their collector electrodes connected to said inverting input, and their emitter electrodes connected to said input terminal through a respective diode, said diodes being poled in the same direction as the emitter-base junction of their respective transistor.
Claim 6
Dependent Claim
127 words
A pulse rejection circuit comprising: an input terminal for connection to a source of pulses; an operational amplifier having an output terminal, an inverting input, and a non-inverting input; a resistance element connected between the input terminal and said inverting input; a capacitance element having one end connected to said inverting input, and the other end connected to said non-inverting input and to an output port for connection to a source of reference potential; a pair of opposite type bipolar transistors having their base electrodeS connected to said output terminal, their collector electrodes connected to said inverting input, and their emitter electrodes connected to said input terminal through a respective diode, said diodes being poled in the same direction as the emitter-base junction of their respective transistor.
Claim 7
Dependent Claim
21 words
A circuit as defined in claim 4, further comprising a third diode connected across a first portion of said resistance element.
Claim 8
Dependent Claim
29 words
A circuit as defined in claim 5 further comprising a fourth diode connected across a second portion of said resistance element, said third and fourth diodes being poled oppositely.
Claim 9
Dependent Claim
46 words
A circuit as defined in claim 4 wherein said resistance element is a potentiometer, and further comprising fifth and sixth diodes connected serially in opposition and across the ends of the potentiometer, the adjustable terminal of the potentiometer being connected to the junction of said diodes.
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) | 1977-07-01 | 1977-12-31 | 1978-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-01 | 1981-12-31 | 1982-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-01 | 1985-12-31 | 1986-07-02 | $7700.00 | Window Closed / Lapsed |