US3732502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Distortion compensated electromagnetic wave circuits
Assignee: AT&T Inc
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Filing: 1971-06-17
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Granted: 1973-05-08
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Expires: 1991-06-17
Abstract
Abstract This application described predistortion and postdistortion compensation arrangements wherein compensation is restricted to the nonlinear portion of the transfer characteristic of the network to be linearized. Accordingly, the compensating signal components employed correspond solely to the distortion components of the transfer characteristic. To avoid dispersion effects, the dynamic characteristics of the compensating networks and the network to be linearized are substantially independent of time.
Inventors
- 👤 H Seidel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:44
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/32; H03F1/3241; H03F1/3252
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
66 words
In combination: an electromagnetic wave circuit having a nonlinear dynamic transfer characteristic; means coupled to the input of said circuit for extracting a portion of any input signal coupled to said circuit; means, using said extracted portion of input signal, for generating compensating distortion components corresponding solely to the higher order terms of said transfer characteristic; and means for injecting said components back into said circuit.
Claim 2
Dependent Claim
66 words
In combination: an electromagnetic wave circuit having a nonlinear dynamic transfer characteristic; means coupled to the input of said circuit for extracting a portion of any input signal coupled to said circuit; means, using said extracted portion of input signal, for generating compensating distortion components corresponding solely to the higher order terms of said transfer characteristic; and means for injecting said components back into said circuit.
Claim 3
Dependent Claim
34 words
The combination according to claim 1 wherein the dynamic transfer characteristic of said circuit and the combined dynamic transfer characteristic of said extracting, said generating and said injecting means are proportional to each other.
Claim 4
Dependent Claim
19 words
The combination according to claim 1 wherein said compensating components are injected into the input end of said circuit.
Claim 5
Dependent Claim
19 words
The combination according to claim 1 wherein said compensating components are injected into the output end of said circuit.
Claim 6
Dependent Claim
12 words
The combination according to claim 1 wherein said circuit is an amplifier.
Claim 7
Dependent Claim
69 words
The combination according to claim 1 wherein the transfer characteristic of said circuit can be expressed by E ao a1e + a2e2 + a3e3 . . . where e is the input signal; E is the output signal; and ao, a1, a2 . . . are constants; and wherein different means are employed to generate each higher order distortion term of said transfer characteristic that is to be canceled.
Claim 8
Dependent Claim
106 words
In combination: an electromagnetic wave circuit having a nonlinear dynamic transfer characteristic; means, coupled to the input of said circuit, for extracting a portion of any signal applied to said circuit; means for coupling components of said extracted portion of input signal to nonlinear networks, each of whose outputs includes a first order signal component and distortion components corresponding to the higher order terms of said transfer characteristic; means for canceling the first order signal component from the output of each of said networks; and means for injecting said remaining distortion components back into said circuit to minimize the distortion introduced by said nonlinear transfer characteristic.
Claim 9
Dependent Claim
106 words
In combination: an electromagnetic wave circuit having a nonlinear dynamic transfer characteristic; means, coupled to the input of said circuit, for extracting a portion of any signal applied to said circuit; means for coupling components of said extracted portion of input signal to nonlinear networks, each of whose outputs includes a first order signal component and distortion components corresponding to the higher order terms of said transfer characteristic; means for canceling the first order signal component from the output of each of said networks; and means for injecting said remaining distortion components back into said circuit to minimize the distortion introduced by said nonlinear transfer characteristic.
References Cited (Backward Citations)
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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) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |