Publications by authors named "Jia-min Chuang"
A dual-mode highly efficient class-E stimulator controlled by a low-Q class-E power amplifier through duty cycle.
IEEE Trans Biomed Circuits Syst
June 2013
This paper presents the design flow of two high-efficiency class-E amplifiers for the implantable electrical stimulation system. The implantable stimulator is a high-Q class-E driver that delivers a sine-wave pulsed radiofrequency (PRF) stimulation, which was verified to have a superior efficacy in pain relief to a square wave. The proposed duty-cycle-controlled class-E PRF driver designed with a high-Q factor has two operational modes that are able to achieve 100% DC-AC conversion, and involves only one switched series inductor and an unchanged parallel capacitor.
View Article and Find Full Text PDFIn situ measurement of tissue impedance using an inductive coupling interface circuit.
IEEE Trans Biomed Circuits Syst
June 2013
Article Synopsis
- The study introduces an inductive coupling impedance measurement (ICIM) method to assess the nerve impedance of dorsal root ganglion (DRG) during pulsed radiofrequency (PRF) stimulation, using a safe low voltage of 7 mV.
- A calibration procedure with a 50-Ω reference resistor is developed for accurate resistance measurement, and a de-embedding technique helps model the ICIM circuit effectively.
- In vivo experiments demonstrate that as the nerve impedance increases, the effectiveness of PRF stimulation for pain relief decreases, and maintaining an excitation voltage below 25 mV is crucial to avoid nonlinear nerve responses.