US3885220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Buffered multiplexer with differential amplifier
Assignee: Applied Automation Inc
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Filing: 1973-12-04
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Granted: 1975-05-20
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Expires: 1993-12-04
Abstract
Abstract A multiplexer is disclosed which comprises a common output circuit having first and second buffer amplifiers and a differential amplifier connected to the outputs of the first and second buffer amplifiers. A plurality of input circuits are provided to receive individual signals. Each input circuit includes third and fourth buffered amplifiers which are connected to respective input terminals. The outputs of the third and fourth buffer amplifiers are connected selectively by switching means to the respective inputs of the first and second buffer amplifiers of the common output circuit.
Inventors
- 👤 Dale A Fluegal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:30
CPC Classifications
G; G08; G08C; G08C15/00; G08C15/06; G08C15/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
169 words
A multiplexer comprising: an output circuit comprising first and second buffer amplifiers, first and second output terminals, a differential amplifier having first and second inputs and an output, means connecting the output of said differential amplifier to said first output terminal, a first potentiometer connected between the output of said first amplifier and said first output terminal, a second potentiometer connected between the output of said second amplifier and said second output terminal, and means connecting the first and second inputs of said differential amplifier to the contactors of said first and second potentiometers, respectively; and a plurality of input circuits, each comprising first and second input terminals, third and fourth buffer amplifiers, means connecting said first input terminal to the input of said third amplifier and said second input terminal to the input of said fourth amplifier, and circuit means including switching means to connect the outputs of said third and fourth amplifiers selectively to the inputs of said first and second amplifiers, respectively, of said output circuit.
Claim 2
Dependent Claim
169 words
A multiplexer comprising: an output circuit comprising first and second buffer amplifiers, first and second output terminals, a differential amplifier having first and second inputs and an output, means connecting the output of said differential amplifier to said first output terminal, a first potentiometer connected between the output of said first amplifier and said first output terminal, a second potentiometer connected between the output of said second amplifier and said second output terminal, and means connecting the first and second inputs of said differential amplifier to the contactors of said first and second potentiometers, respectively; and a plurality of input circuits, each comprising first and second input terminals, third and fourth buffer amplifiers, means connecting said first input terminal to the input of said third amplifier and said second input terminal to the input of said fourth amplifier, and circuit means including switching means to connect the outputs of said third and fourth amplifiers selectively to the inputs of said first and second amplifiers, respectively, of said output circuit.
Claim 3
Dependent Claim
81 words
The multiplexer of claim 1 wherein each of said input circuits includes an AND circuit having first and second inputs and an output, and means connecting the output of said AND circuit to said switching means to close same in response to the AND circuit being actuated by signals being received at its first and second inputs; and further comprising means connecting the second inputs of the AND circuits of said plurality of input circuits together to receive a common signal.
Claim 4
Dependent Claim
19 words
The multiplexer of claim 1 wherein a low pass filter is connected in each of said input circuit means.
Claim 5
Dependent Claim
23 words
The multiplexer of claim 1 wherein a low pass filter is connected between said switching means and said first and second buffer amplifiers.
Claim 6
Dependent Claim
25 words
The multiplexer of claim 1, further comprising means to apply a bias potential of preselected magnitude to one of the inputs of said differential amplifier.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |