Linear amplification with nonlinear devices

Details Linear amplification with nonlinear devices Linear amplification with nonlinear devices

1978-12-15

1979-12-11

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

330 53, 330124R, H03F 338

Patent

active

041785576

ABSTRACT:
The present linear amplifier uses nonlinear components where an input signal with amplitude and phase variations is concurrently applied to a limiter (41) and an envelope detector (42) which provide signals that serve as a carrier signal and a modulating signal, respectively, to a phase modulator comprising two or more linear suppressed-carrier amplitude modulators (50) connected in cascade. The weighted carrier signal and weighted outputs of the even-numbered amplitude modulators (50.sub.2, 50.sub.4, . . . ) are added separately from the weighted outputs of the odd-numbered amplitude modulators (50.sub.1, 50.sub.3, . . . ) to generate two signals which are combined in a quadrature coupler (56). The two outputs of the quadrature coupler are separately amplified in a pair of amplifiers (60, 61) and combined in a second quadrature coupler (64) to provide a substantially linearly amplified output signal of the input signal.

REFERENCES:
patent: 3777275 (1973-12-01), Cox
patent: 3927379 (1975-12-01), Cox et al.
Cox, "Linear Amplification with Nonlinear Components," IEEE Transactions on Communications, Dec. 1974, vol. Com-22, No. 12, pp. 1942-1945.
Cox et al., "Component Signal Separation and Recombination for Linear Amplification with Nonlinear Components," IEEE Transactions on Communications, Nov., 1975, vol. Com-23, No. 11, pp. 1281-1287.

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