Distortion generating circuit

Details Distortion generating circuit Distortion generating circuit

1994-04-13

1997-02-04

Chin, Wellington

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

330149, 333 81R, H04B 1000

Patent

active

056004729

ABSTRACT:
A distortion generating circuit of the present invention comprises a linear attenuator which has an input impedance substantially coincident with an impedance of a transmission path of input signal and an output impedance substantially coincident with an impedance of a transmission path of output signal; and at least one diode which is connected in an alternating current manner in parallel with the linear attenuator with respect to the input signal into the linear attenuator and which generates nonlinear distortion for a component in the input signal input thereinto; which outputs an AC sum of an output from the linear attenuator and an output from the diode. By this arrangement, desired distortion can be well given in a simple circuit arrangement while suppressing generation of unnecessary intermodulation distortion. An optical transmitter, an optical receiver or an amplifier can be constructed using the distortion generating circuit of the present invention, obtaining a signal with reduced distortion.

REFERENCES:
patent: 4992754 (1991-02-01), Blauvelt et al.
patent: 5119392 (1992-06-01), Childs
patent: 5132639 (1992-07-01), Blauvelt et al.
patent: 5172068 (1992-12-01), Childs
patent: 5179461 (1993-01-01), Blauvelt et al.
patent: 5262741 (1993-11-01), Kitakubo
Textbook .fwdarw. 4th Edition Electronic Devices and Circuit Theory, Robert Boylestad, 1987, relevant p. 107.
Stewart et al, "Predistortion Linearisation of Amplifiers for UHF Mobile Radio", Proeccdings of the European Microwave Conference, 1988, Sep. 12-16, 1988, pp. 1017-1022.
Gnauck et al., Comparison of Direct and External Modulation for CATV Lightwave Transmission At 1-5.mu. Wavelength, Electronic Letters, vol. 28, No. 20, Sep. 24, 1992, pp. 1875-1876.

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