SSB pulse modulator

Details SSB pulse modulator SSB pulse modulator

1986-03-26

1988-07-26

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 37R, 332 41, 332 45, 332 48, 375 43, 375 61, 455 47, 455109, H03C 160

Patent

active

047603542

ABSTRACT:
An SSB pulse modulator which attenuates unwanted even harmonics of the carrier frequency without expensive filtering. The modulator comprises two pairs of comparators (12, 14 and 16, 18), and the sine and cosine components of the carrier signal are modulating signal [a(t)] and the Hilbert transform [a(t)] thereof are applied to respective ones of the comparators. EX-OR gates (20, 22) multiply together the outputs of each pair of comparators (12, 14 and (16, 18), the multiplied outputs being combined with each other in a signal combining arrangement (24). Each pair of the comparators produces the unwanted even harmonics, which are then attenuated by subtraction from each other in the combining arrangement.

REFERENCES:
Nohara et al, "Generation of Single-Sideband Signal Using Switched-Mode Technique", Bull. Univ. Osaka Prefect A. (Japan), vol. 23, No. 2, 1974, pp. 167-176.

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