Chin-Hong Chen

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An integrated low-output-ripple step-down DC-DC converter, which cascades a Buck converter with a low-dropout regulator (LDO), is presented. The output of the Buck converter can be used to supply digital circuits, while the LDO output is used to power analog circuits. The designed Buck converter can adaptively and automatically switch between the(More)
Conductance catheter is a tool for estimating realtime ventricular volume by measuring time-varying ventricular admittance, provided that myocardial contribution can be determined and then removed. One approach for determining the myocardial contribution is to measure both the magnitude and phase of the ventricular admittance rather than only its magnitude.(More)
Myocardial functions can be characterized from ventricular pressure-volume relations. In small animals, the instantaneous ventricular volume is typically measured by using a miniaturized conductance catheter. In this work, a DSP-based conductance catheter measurement system is proposed, which adopts the admittance measurement method to estimate the(More)
The conductance catheter technique was developed in the 1980s to measure instantaneous ventricular conductance. After converting measured conductance to volume signals by use of the classic Baan conductance-to-volume equation, real-time pressure-volume (PV) relations can be obtained. A nonlinear conductance-to-volume conversion equation was proposed by Wei(More)
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