MULTI-POWER DOMAIN OPERATIONAL AMPLIFIER AND VOLTAGE GENERATOR USING THE SAME

摘要

A multi-power domain operational amplifier includes an input stage circuit, a power domain transforming circuit and an active load. The input stage circuit is configured to transform a set of input voltages into a set of input currents in a first power domain. The power domain transforming circuit is configured to transform the set of input currents into a set of output currents in a second power domain. The active load is configured to generate an output voltage according to the set of output currents. A common mode range of the output voltage is shifted as compared with a common mode range of the set of input voltages.

主权项

1. A voltage generator, comprising:
a cascade resistor having a first feedback terminal and a second feedback terminal; a first regulator, which is configured to output a first output voltage and comprises a multi-power domain operational amplifier, which has a negative feedback configuration, operates in a first power domain and a second power domain different from the first power domain, and has an inverting input terminal receiving a first reference voltage, and a noninverting input terminal coupled to the first feedback terminal; and a second regulator, which is configured to output a second output voltage, and comprises a single power domain operational amplifier operating in a third power domain and having the negative feedback configuration, wherein the single power domain operational amplifier has an inverting input terminal receiving a second reference voltage and a noninverting input terminal coupled to the second feedback terminal.