US4140981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linearizing network
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1978-02-21
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Granted: 1979-02-20
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Expires: 1998-02-21
Abstract
Abstract A linearizing circuit is described which gives a nonlinear relation between an input and an output signal of the circuit. Such a circuit can be used to compensate for the nonlinearity in, for example, a frequency modulator. The circuit includes a nonlinear element, preferably a PIN-diode connected in a voltage divider to provide a biasing current to the element. An attenuating and an amplifying circuit are connected to the input and to the output, respectively, of the circuit. By varying the values of the attenuation/amplification and the value of the operation point of the element, the nonlinearity of the circuit can be varied.
Inventors
- 👤 Tage A. S. Bergman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:07
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/02; H03C3/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
113 words
Linearizing circuit which gives a nonlinear relation between an incoming and an outgoing signal, preferably for compensation of the nonlinearity of a frequency modulator, comprising (a) an attenuator the input of which forms the input of the circuit, (b) a voltage divider connected to a supply voltage source, said voltage divider containing a nonlinear element having a resistance R = k·I x , where I = the current through the element and the factors k, x are constants, specific for the element, (c) an amplifier whose output forms the output of the circuit, the output of the attenuator and the input of the amplifier being connected to each terminal of the nonlinear element.
Claim 2
Dependent Claim
113 words
Linearizing circuit which gives a nonlinear relation between an incoming and an outgoing signal, preferably for compensation of the nonlinearity of a frequency modulator, comprising (a) an attenuator the input of which forms the input of the circuit, (b) a voltage divider connected to a supply voltage source, said voltage divider containing a nonlinear element having a resistance R = k·I x , where I = the current through the element and the factors k, x are constants, specific for the element, (c) an amplifier whose output forms the output of the circuit, the output of the attenuator and the input of the amplifier being connected to each terminal of the nonlinear element.
Claim 3
Dependent Claim
25 words
A circuit as claimed in claim 1, wherein the attenuation of the attenuator is equal to the inverted value of the amplification of the amplifier.
Claim 4
Dependent Claim
15 words
A circuit as claimed in claim 1, wherein said nonlinear element consists of a PIN-diode.
Claim 5
Dependent Claim
19 words
a circuit as claimed in claim 3, wherein the resistance of the PIN-diode fulfills the condition R = k/I.
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) | 1982-02-19 | 1982-08-21 | 1983-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-19 | 1986-08-21 | 1987-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-19 | 1990-08-21 | 1991-02-20 | $7700.00 | Window Closed / Lapsed |