In the morning of July 4th, 2019, at the invitation of TXC Corporation, Professor Ji Wang presented a talk on "Quartz Crystal Cuts with Ideal Frequency Temperature Relationship and Its Application" at TXC Corporation. The talk was broadcasted by satellite link to TXC Headquarters in Taiwan, Ningbo Plant, and Chongqing Plant. Participants in the talk and discussions followed were all staff of TXC, including the Chairman of the company. Professor Wang's talk focused on the new cuts of quartz crystals with highly stable frequency-temperature relation. Temperature is the most important factor affecting the stability of operations of quartz crystal resonators. Most cuts of quartz crystal resonators are named for temperature properties. Historically, a series of temperature-stable cuts have been proposed, but there is a lack of methods to find similar cut-type, and engineers often wondering if there are better cuts than these known cuts? Professor Wang and graduate student Shoayun Wang first proposed a systematical method for finding crystal cuts with stable frequency-temperature relation, and then used this method to the known cuts for verification. The results are very close to the existing cuts, indicating the reliability of the method. Finally, using this method, some new cuts that are much better than the existing cuts with good temperature-frequency performance are found. These cuts have potential application in commercial products, which has aroused great interest from companies including TXC which is a partner for many years. They have expressed their interests to work with the Piezoelectric Device Laboratory to develop the novel products.
Professor Wang and his team of Piezoelectric Device Laboratory have long been engaged in the analysis and design of quartz crystal resonators, including vibration analysis of crystal plates which are core components of resonators, calculation of resonator circuit parameters, and analysis of resonator stability. Professor Wang maintains close cooperation with leading companies in the design and manufacture quartz crystal resonators. The TXC Corporation is one of leading companies of quartz crystal resonators for leading electronics giants including Apple and Huawei.