Freescale Semiconductor,inc.

André L R Mansano

Alfredo Olmos

Andre Luis Vilas Boas

Fabio Duarte De Martin

Fabio De Lacerda

André Luis Vilas Boas

A regulator () for a charge pump () includes a clock amplitude modulator () that changes voltage of a clock signal used in operation of the charge pump in response to changes in magnitude of output voltage of the change pump. The clock amplitude modulator is powered by an output of an auxiliary circuit (). The output of the auxiliary circuit is at a higher voltage than an input voltage of the charge pump. A maximum amplitude of the voltage of the clock signal is higher than the input voltage of the charge pump.

Charge pump voltage regulator

A switched-capacitor amplifier circuit (and) with rail-to-rail capability without requiring a rail-to-rail operational amplifier includes a switched-capacitor amplifier (and) and an input network () coupled to the switched-capacitor amplifier. The switched-capacitor amplifier includes a non-rail-to-rail operational amplifier (and). The input network prevents the non-rail-to-rail operational amplifier from receiving an input differential signal that has a common-mode voltage at or near rails of the non-rail-to-rail operational amplifier. Voltages at input terminals of the operational amplifier remain near analog ground, which is an arbitrary voltage level between the rails, during both phases of switching in the switched-capacitor amplifier. In one embodiment, the switched-capacitor amplifier uses a correlated double sampling technique.

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The Hague, Netherlands

André L R Mansano