Patent US3633122A successfully refreshed from Google Patents.
US3633122A
Expired / Lapsed
US
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Active all-pass network
Assignee: AT&T Inc
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Filing: 1968-11-25
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Granted: 1972-01-04
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Expires: 1988-11-25
Abstract
Abstract A network is set forth which achieves a second-order all-pass function utilizing only one differential-type amplifier, two capacitors and four resistors. By utilizing both inputs to the operational amplifier, the desired performance may be achieved.
Inventors
- 👤 Felix J Braga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:26
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/04; H03H11/12; H03H11/126
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
196 words
An electrical network comprising a differential-type operational amplifier having two inputs and supplying an output, an electrical signal applied to one input through a fiRst admittance element, Y1, a second admittance element Y2 connected between said one input and a point of reference potential, means for applying said output to the other input of said differential-type operational amplifier through an admittance network, said admittance network comprising one end of a third Y3 and one end of a fourth Y4 admittance connected together and receiving the output of said differential-type operational amplifier, the other end of said third admittance being connected to one end of a fifth Y5 admittance and connected through a sixth admittance Y6 to the input side of said first admittance Y1, and the other end of said fourth and fifth admittances being connected together and to the other input of said differentialtype operational amplifier, said electrical network having a transfer function of the generalized form where E0 is the voltage out, Ein is the voltage in, and K is a multiplication factor, said admittances being thus related to each other and to the gain of said amplifier to produce an allpass network characteristic.
Claim 2
Dependent Claim
196 words
An electrical network comprising a differential-type operational amplifier having two inputs and supplying an output, an electrical signal applied to one input through a fiRst admittance element, Y1, a second admittance element Y2 connected between said one input and a point of reference potential, means for applying said output to the other input of said differential-type operational amplifier through an admittance network, said admittance network comprising one end of a third Y3 and one end of a fourth Y4 admittance connected together and receiving the output of said differential-type operational amplifier, the other end of said third admittance being connected to one end of a fifth Y5 admittance and connected through a sixth admittance Y6 to the input side of said first admittance Y1, and the other end of said fourth and fifth admittances being connected together and to the other input of said differentialtype operational amplifier, said electrical network having a transfer function of the generalized form where E0 is the voltage out, Ein is the voltage in, and K is a multiplication factor, said admittances being thus related to each other and to the gain of said amplifier to produce an allpass network characteristic.
Claim 3
Dependent Claim
29 words
An electrical network as set forth in claim 1 wherein said first, second, fourth, and sixth admittances are conductances and said third and fifth admittances are capacitive susceptances, and
Claim 4
Dependent Claim
29 words
An electrical network as set forth in claim 1 wherein said first, second, third, and fifth admittances are conductances and said fourth and sixth admittances are capacitive susceptances, and
Claim 5
Dependent Claim
29 words
An electrical network as set forth in claim 1 wherein said first, second, third and sixth admittances are conductances and said fourth and fifth admittances are capacitive susceptances, and
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |