Abstract
A Lamb wave delay line oscillator with four terminated transducers is described as playing a key role in 16-valued frequency shift keying (16-FSK) modulation. For the oscillation of 16-valued frequencies, four transducers located at the central part of the Lamb wave device are used to feed 4-bit modulating signals via two field effect transistors as voltage-dependent resistors. The experimental results on 16-valued frequency modulation using the 10.6 MHz Lamb wave device are in good agreement with the operation principle.
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