Patent ID: 7428015

Claim:
An offset-able reference voltage generator for generating a reference voltage having a voltage offset, comprising: a first inductor-controlled switch, having a first terminal coupled to a original reference voltage; a first capacitor, having a first terminal coupled to a second terminal of the first inductor-controlled switch; a voltage selection device, coupled to a second terminal of the first capacitor for selecting and outputting a first offset voltage or a second offset voltage; and a first operational amplifier, having a first input terminal coupled to the reference voltage, a second input terminal coupled to the second terminal of the first inductor-controlled switch, and an output terminal for outputting the reference voltage; wherein during a first time period, the offset-able reference voltage generator activates the first inductor-controlled switch to form a short-circuit and triggers the voltage selection device to select and output the first offset voltage so that the first capacitor samples from the original reference voltage, and during a second time period, the voltage generator activates the first inductor-controlled switch to form an open circuit so that the original reference voltage is registered by the first capacitor.