US 2010/0244940 A1Published application

External compensation for input current source

AssigneeNanya Technology Corporation

InventorsPhat Truong, Pauline Mai, Chia-Jen Chang

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Abstract

An integrated circuit includes: a pre-driver stage, coupled to an external supply voltage, for controlling the final driver stage; a final driver stage, coupled to the pre-driver stage and the external supply voltage, for providing an output voltage; a compensation circuit, coupled to the pre-driver stage, for providing a bias voltage to the pre-driver stage that compensates for variation in the external supply voltage, to control current through the pre-driver stage; and a bias circuit, coupled to the external supply voltage and the compensation circuit, for providing a bias voltage as an input to the compensation circuit.

Claims9

Dependent claims

A compensation circuit, for compensating an external supply voltage, the compensation circuit comprising:

an operational amplifier, having a bias voltage as a first input of the operational amplifier, and a second input;
a first PMOS pair, coupled to the output of the operational amplifier and the external supply voltage, where the output of the first PMOS pair is the second input of the operational amplifier;
a second PMOS pair, coupled to the output of the operational amplifier and the external supply voltage, where the output of the second PMOS pair is an output voltage of the compensation circuit, and is equal to the input voltage−χΔV;
a first NMOS circuit, coupled to the first and second PMOS pair by means of a blend connection, and coupled to the external supply voltage, a reference voltage, and a nominal voltage, for providing an output voltage equal to the reference voltage—the nominal voltage/3−χΔV;
and
a second NMOS circuit, coupled to the first NMOS circuit and the external supply voltage, for providing an output voltage equal to the external supply voltage/3.

3 more elements

An integrated circuit, comprising:

a pre-driver stage, coupled to an external supply voltage, for controlling final driver stage voltage;
a final driver stage, coupled to the pre-driver stage and the external supply voltage, for providing an output voltage;
a compensation circuit, coupled to the pre-driver stage, for providing a first bias voltage to the pre-driver stage that compensates for variation in the external supply voltage, to control current through the pre-driver stage;
and
a bias circuit, coupled to the external supply voltage and the compensation circuit, for providing a second bias voltage as an input to the compensation circuit.

2 more elements

Dependencies are inferred from the claim text.