Charge Pump for Negative High Voltage Generation with Variable Voltage Gain
نویسندگان
چکیده
In this letter, a new cross-coupled charge pump for negative high voltage generation has been proposed. The problem of shoot-through current in the conventional cross-coupled charge pump is solved by a four clock phase scheme. By switching the power supply to each stage based on the supply voltage, a variable voltage gain is obtained. A complete analysis of the interaction between the power efficiency, area, and frequency are presented. The proposed cross-coupled charge pump has been designed to deliver 40μA with a wide supply range from 2.5V to 5.5V using 0.18μm high voltage LDMOS technology. In order to have a fixed output voltage within -15±3V, the voltage gain of the charge pump circuit is variable from -3X to -7X and is based on the supply voltage.
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