A low-power switched-capacitor capacitive transducer with high resolution

• Main Authors: Zhang, Xiao Ling, Chan, Pak Kwong
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2010
• Subjects: DRNTU::Engineering::Electrical and electronic engineering
• Online Access: https://hdl.handle.net/10356/92486; http://hdl.handle.net/10220/6254
• Institution: Nanyang Technological University

A new capacitive transducer using a pseudodifferential-input–single-ended output topology for lowpower portable applications is presented. This is based on a switched-capacitor chopper-stabilized pseudodifferential integrator structure that is cascaded with a chopper-stabilized differential difference amplifier, consisting of a single output and a bandpass ac output. The measured results have shown that the transducer integrated circuit, with a sampling rate of 64 kHz in a 0.6-μm CMOS technology, dissipates 820 μA at a 3.3-V supply and exhibits a low noise characteristic. For a 100-Hz bandwidth, the input-referred minimum detectable capacitances are 57.24 and 33.82 aF with reference to the single output and the bandpass output, respectively.