title: Note: Wide band amplifier for quartz tuning fork sensors with digitally controlled stray capacitance compensation.
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.
authors.affiliation: Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China.
authors.forename: Ping
authors.initials: P
authors.lastname: Peng
authors.affiliation: Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China.
authors.forename: Lifeng
authors.initials: L
authors.lastname: Hao
authors.affiliation: Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China.
authors.forename: Ning
authors.initials: N
authors.lastname: Ding
authors.affiliation: Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China.
authors.forename: Weicheng
authors.initials: W
authors.lastname: Jiao
authors.affiliation: Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Wang
authors.affiliation: Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China.
authors.forename: Rongguo
authors.initials: R
authors.lastname: Wang