Modulator and transmitter

Pulse or digital communications – Repeaters – Testing

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Details

331107A, 332102, H03C 700

Patent

active

050162608

ABSTRACT:
A modulator includes a plurality of piezoelectric resonators, a plurality of oscillator circuits, arranged in a one-to-one correspondence with the plurality of piezoelectric resonators, for generating different frequency signals in correspondence with corresponding piezoelectric resonators, and a switching circuit for selecting a predetermined frequency signal from the plurality of different frequency signals on the basis of a value of a digital signal to be modulated, and for outputting the selected frequency signal as a modulation signal.

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Robinson, "A Saw Stabilized Monolithic Pulse Amplitude Modulated Microtransmitter," IEEE Transactions on Consumer Electronics, vol. CE-33, No. 3, pp. 405-412, Aug. 1987.
Mizutani et al., "An Ultrasonic Modulator for 16-Valued Frequency Shift Keying," Proceedings of 8th Symposium on Ultrasonic Electronics, Japanese Journal of Applied Physics, vol. 27, Supplement 27-1, pp. 178-180, Dec. 8-10, 1987.

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