| 摘要 |
A signal generating unit comprises a multi-frequency having two-pairs of electrodes to excite reference and oscillation modes, a difference circuit, a , a direct frequency synthesizer to shape reference frequency oscillation in an oscillation spectrum translation circuit on the base of a phase lock loop. The output signal of the is used as an adjusting signal for the direct frequency synthesizer, the output of oscillation spectrum translation circuit serves as the output of signal generating unit. A first reference mode frequency detector, a second frequency detector of thermally sensitive mode, a two-channel analog-to-digital converter, a multi-channel direct frequency synthesizer are introduced. |
