Studies on the operation of trap filters and oscillators systems based on ceramic resonators at the cryogenic temperatures.

Abstract

We investigated the temperature dependence of the applications of piezo PZT ceramic resonators down to 93 K in oscillators and filters circuits inside a frequency range of 400 kHz–4.0 MHz. For both systems, their waveforms were plotted at different temperature values ranging from room level (293 K) down to (93 K). From which, it is clearly shown that, cryogenic temperature effect on the operation of the trap filter system was shown to increase the voltage value at stop-band from 1.40 V, measured at 293 K, up to 4.40 V. The rise and fall times of the square wave oscillator were shown to increase slightly with temperature decreasing. Initial values of 92.3 ns, and 85.8 ns, measured at 293 K, were observed to increase up to 106 ns and 107 ns, measured at 93 K, respectively, while the signal output was kept constant. But for the sine-wave oscillator, its frequency, and output voltage were shown decrease as the temperature decreases