| 摘要 |
PROBLEM TO BE SOLVED: To remove the effect of common mode noise in a single end non-differential switched capacitor circuit. SOLUTION: The circuit creates a capacitance divider using sampling capacitors Cs to create a stable and a noise-free common mode voltage (Vcom) signal. Once created, this Vcom signal is coupled between large common mode capacities Ccom which are preferably located outside to further be controlled in their values. Thereafter, the voltage Vcom can be stabilized while data are disconnected. In this way, the Vcom signal is not provided to the circuit, but instead, cleanly generated within the circuit itself when needed. Thereafter, the generated Vcom signal is made parallel with an integration capacitor C1 to generate the non-differential output voltage Vout. Then, the sampling capacitors Cs are shorted to remove charge stored in them and the process is repeated. COPYRIGHT: (C)2006,JPO&NCIPI
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