US3906390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transfer function control networks
Assignee: Post Office
•
Filing: 1974-10-23
•
Granted: 1975-09-16
•
Expires: 1994-10-23
Abstract
Abstract A network particularly useful in thick or thin film circuitry for use in telecommunication systems provides either an all-pass or notch filter function with the same basic component layout but with variously dimensioned component values. The circuit consists of a differential input operational amplifier having both inverting and non-inverting inputs connected by way of first and second resistors respectively to an input terminal (the second resistor being in parallel with a first capacitor) and having its output terminal connected to its inverting input by way of a third resistor and connected by way of a fourth resistor in series with a second capacitor to its non-inverting input, the network having a reference terminal connected by way of a fifth resistor to the junction between the second capacitor and the fourth resistor so as to provide an input port between the reference terminal and the input terminal and an output port between the reference terminal and the amplifier output.
Inventors
- 👤 John Mortimer Rollett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:27
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/04; H03H11/12; H03H11/126
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
184 words
A transfer function control network comprising a differential input operational amplifier having an inverting input, a noninverting input and an output, and having a high gain A; a first element having an admittance Y1 and connected between the said output and the inverting input of the amplifier; a second element having an admittance Y2 and connected between a signal input terminal and the non-inverting input of the amplifier; a third element having an admittance Y3 and a fourth element having an admittance Y4 connected in series between the non-inverting input and the output of the amplifier; a fifth element having an admittance Y5 and connected between a reference terminal and the junction between the third and fourth elements; and a sixth element having an admittance Y6 and connected between the signal input terminal and the inverting input terminal of the amplifier, the arrangement being such that when an input signal V1 is applied between the signal input terminal and the reference terminal an output signal Vo is derived from between the output of the amplifier and the reference terminal so that the transfer function:
Claim 2
Dependent Claim
184 words
A transfer function control network comprising a differential input operational amplifier having an inverting input, a noninverting input and an output, and having a high gain A; a first element having an admittance Y1 and connected between the said output and the inverting input of the amplifier; a second element having an admittance Y2 and connected between a signal input terminal and the non-inverting input of the amplifier; a third element having an admittance Y3 and a fourth element having an admittance Y4 connected in series between the non-inverting input and the output of the amplifier; a fifth element having an admittance Y5 and connected between a reference terminal and the junction between the third and fourth elements; and a sixth element having an admittance Y6 and connected between the signal input terminal and the inverting input terminal of the amplifier, the arrangement being such that when an input signal V1 is applied between the signal input terminal and the reference terminal an output signal Vo is derived from between the output of the amplifier and the reference terminal so that the transfer function:
Claim 3
Dependent Claim
124 words
A transfer function control network as claimed in claim 1 wherein: said first element is a first resistance having a conductance G1; said second element is a second resistance having a conductance G2 in parallel with a first capacitor having a capacitance C2; said third element is a second capacitor having a capacitance C3; said fourth element is a third resistance having a conductance G4; said fifth element is a fourth resistance having a conductance G5; and said sixth element is a fifth resistance having a conductance G6, and wherein the transfer function for the network for an input signal Vi and an output signal Vo expressed in terms of the conductances and capacitances of the components and s the complex frequency variable is:
Claim 4
Dependent Claim
44 words
A transfer function control network as claimed in claim 2 in which the coefficients of s, the complex frequency variable, in numerator and denominator the transfer function equation are equal in magnitude and opposite in sign so that the network forms an all-pass network.
Claim 5
Dependent Claim
27 words
A transfer function control network as claimed in claim 2 in which the first and fifth resistances and the first and second capacitors are dimensioned such that:
Claim 6
Dependent Claim
23 words
A transfer function control network as claimed in claim 4 in which the first and second capacitors are equal in value such that:
Claim 7
Dependent Claim
16 words
A transfer function control network as claimed in claim 2 having its elements dimensioned such that:
Claim 8
Dependent Claim
23 words
A transfer function control network as claimed in claim 6 in which the first and second capacitors are equal in value such that:
References Cited (Backward Citations)
US3838351A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |