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Updated: Mar 29, 2026

Construction of a Wireless-Enabled Endoscopically Implantable Sensor for pH Monitoring with Zero-Bias Schottky Diode-based Receiver
Published on: August 27, 2021
Note: Wide band amplifier for quartz tuning fork sensors with digitally controlled stray capacitance compensation
Ping Peng1, Lifeng Hao1, Ning Ding1
1Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China.
Abstract:
We presented a preamplifier design for quartz tuning fork (QTF) sensors in which the stray capacitance is digitally compensated. In this design, the manually controlled variable capacitor is replaced by a pair of varicap diodes, whose capacitance could be accurately tuned by a bias voltage. A tuning circuit including a single side low power operational amplifier, a digital-to-analog converter, and a microprocessor is also described, and the tuning process can be conveniently carried out on a personal computer. For the design, the noise level was investigated experimentally.
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