Charge pump for scaling the highest of multiple voltages when at least one of the multiple voltages varies

摘要

A charge pump includes a scaler circuit and a selector circuit. The scaler circuit is designed to scale an intermediate voltage by a scaling factor to generate a scaled voltage. The selector circuit is designed to select and provide the intermediate voltage from multiple voltages. The selector circuit includes a comparator block to generate a select signal indicating which of the multiple voltages has the highest magnitude. The selector circuit includes multiple switches, each switch to receive a respective voltage from among the multiple voltages and pass the corresponding voltage as the intermediate voltage if the select signal indicates that the voltage received by the corresponding switch has the highest magnitude.