Modulation system capable of accurately compensating for nonline

Details Modulation system capable of accurately compensating for nonline Modulation system capable of accurately compensating for nonline

1990-01-05

1991-01-15

Pascal, Robert J.

Modulators

Frequency modulator

Including stabilization or alternatively distortion, noise...

329304, H03C 308

Patent

active

049856880

ABSTRACT:
In a modualtion system responsive to a first sampled signal (31) of a first sampling rate for supplying a modulated analog signal to an amplifier having nonlinearities to make the amplifier produce an amplified output signal, a selector (72) selects the first sampled signal and a second sampled signal of a second sampling rate as a selected signal when supplied with first and second control signals, respectively. The second sampling rate is equal to 1/N (N: 2, 3, . . . ) of the first sampling rate. A processing arrangement (36) processes the selected signal with reference to a difference between the selected signal and an additional digital signal (35) to compensate for the nonlinearities to produce a processed signal. The processed signal is modulated into the modulated analog signal. The amplified output signal is demodulated and converted into the additional digital signal by a converter (40). A comparator (71) compares an absolute value of the difference with a threshold value and produces the first control signal when the absolute value is less than the threshold value. Otherwise, the second control signal is produced. A controller ( 78) may control a phase of a sampling signal supplied to the converter so that a quotient of the difference by a differential of the selected signal becomes equal to zero.

REFERENCES:
patent: 4700151 (1987-10-01), Nagata

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