US3636466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Building block for active rc filters
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1970-02-25
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Granted: 1972-01-18
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Expires: 1990-02-25
Abstract
Abstract A building block for active RC filters including three amplifiers. The output of one amplifier is connected to the input of another amplifier via an impedance. Furthermore, the output of one amplifier is connected to the output terminal of the building block. The inputs of the amplifiers are each via an impedance connected to the input terminal of the building block and via another impedance to the output terminal. Because of the fact that the impedances between the in- and output terminals and the inputs of the amplifiers are triamble, the zeros and the poles of the transfer function can be arbitrarily located in the complex s plane.
Inventors
- 👤 Kare Hjovard Mossberg
- 👤 Dag E Son Akerberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:14
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/04; H03H11/12; H03H11/1217; H03H11/1252
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
143 words
A building block for active RC filters having a basic network comprising an input terminal, an output terminal, first, second and third amplifiers, a first impedance connecting the input of said first amplifier to said input terminal, a second impedance connecting the input of said first amplifier to said output terminal, a third impedance consisting of a first resistor and a first capacitor connecting the input of said third amplifier to said output terminal, a fourth impedance consisting of a second resistor and a second capacitor connecting the input of said third amplifier to said input terminal, means for connecting the output of said first amplifier to the input of said second amplifier, means for connecting the output of said second amplifier to the input of said third amplifier, and means for connecting the output of said third amplifier to said output terminal.
Claim 2
Dependent Claim
143 words
A building block for active RC filters having a basic network comprising an input terminal, an output terminal, first, second and third amplifiers, a first impedance connecting the input of said first amplifier to said input terminal, a second impedance connecting the input of said first amplifier to said output terminal, a third impedance consisting of a first resistor and a first capacitor connecting the input of said third amplifier to said output terminal, a fourth impedance consisting of a second resistor and a second capacitor connecting the input of said third amplifier to said input terminal, means for connecting the output of said first amplifier to the input of said second amplifier, means for connecting the output of said second amplifier to the input of said third amplifier, and means for connecting the output of said third amplifier to said output terminal.
Claim 3
Dependent Claim
22 words
The building block of claim 1 further comprising a third capacitor connecting said input terminal to the output of said first amplifier.
Claim 4
Dependent Claim
37 words
The building block of claim 2 further comprising a fifth impedance connecting the input of said second amplifier to said input terminal and a sixth impedance connecting the input of said second amplifier to said output terminal.
Claim 5
Dependent Claim
25 words
The building block of claim 1 further comprising a third capacitor connecting the input of said second amplifier to the output of said second amplifier.
Claim 6
Dependent Claim
37 words
The building block of claim 4 further comprising a fifth impedance connecting the input of said second amplifier to said input terminal and a sixth impedance connecting the input of said second amplifier to said output terminal.
Claim 7
Dependent Claim
14 words
The building block of claim 5 wherein said fifth and sixth impedances include capacitors.
Claim 8
Dependent Claim
159 words
A building block for active RC filters having a basic network comprising an input terminal, an output terminal, first, second and third amplifiers, a first impedance connecting the input of said first amplifier to said input terminal, a second impedance connecting the input of said first amplifier to said output terminal, a third impedance consisting of a first resistor and a first capacitor connecting the input of said third amplifier to said output terminal, a fourth impedance consisting of a second resistor and a second capacitor connecting the input of said third amplifier to said input terminal, means for connecting the output of said first amplifier to the inputs of said second and third amplifiers, a third capacitor connecting the output of said second amplifier to the input of said first amplifier, a third resistor connecting the input to the output of said second amplifier, and means for connecting the output of said third amplifier to said output terminal.
Claim 9
Dependent Claim
159 words
A building block for active RC filters having a basic network comprising an input terminal, an output terminal, first, second and third amplifiers, a first impedance connecting the input of said first amplifier to said input terminal, a second impedance connecting the input of said first amplifier to said output terminal, a third impedance consisting of a first resistor and a first capacitor connecting the input of said third amplifier to said output terminal, a fourth impedance consisting of a second resistor and a second capacitor connecting the input of said third amplifier to said input terminal, means for connecting the output of said first amplifier to the inputs of said second and third amplifiers, a third capacitor connecting the output of said second amplifier to the input of said first amplifier, a third resistor connecting the input to the output of said second amplifier, and means for connecting the output of said third amplifier to said output terminal.
Claim 10
Dependent Claim
37 words
The building block of claim 7 further comprising a fifth impedance connecting the input of said second amplifier to said input terminal and a sixth impedance connecting the input of said second amplifier to said output terminal.
Claim 11
Dependent Claim
157 words
A building block for active RC filters having a basic network comprising an input terminal, an output terminAl, first, second and third amplifiers, a first impedance connecting the input of said first amplifier to said input terminal, a second impedance connecting the input of said first amplifier to said output terminal, a third impedance consisting of a first resistor and a first capacitor connecting the inpUT OF said third amplifier to said output terminal, a fourth impedance consisting of a second resistor and a second capacitor connecting the input of said third amplifier to said input terminal, means for connecting the output of said first amplifier to said output terminal, means for connecting the output of said second amplifier to input of said third amplifier, means for connecting the output of said third amplifier to the inputs of said first and second amplifiers, and a third capacitor connecting the input to the output of said second amplifier.
Claim 12
Dependent Claim
157 words
A building block for active RC filters having a basic network comprising an input terminal, an output terminAl, first, second and third amplifiers, a first impedance connecting the input of said first amplifier to said input terminal, a second impedance connecting the input of said first amplifier to said output terminal, a third impedance consisting of a first resistor and a first capacitor connecting the inpUT OF said third amplifier to said output terminal, a fourth impedance consisting of a second resistor and a second capacitor connecting the input of said third amplifier to said input terminal, means for connecting the output of said first amplifier to said output terminal, means for connecting the output of said second amplifier to input of said third amplifier, means for connecting the output of said third amplifier to the inputs of said first and second amplifiers, and a third capacitor connecting the input to the output of said second amplifier.
Claim 13
Dependent Claim
37 words
The building block of claim 9 further comprising a fifth impedance connecting the input of said second amplifier to said input terminal and a sixth impedance connecting the input of said second amplifier to said output terminal.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |