Patent ID: 6947774

Claim:
A voltage regulator having a first terminal, a second terminal and a third terminal, the first terminal being coupled to receive an input supply voltage (Vin), the second terminal adapted to provide a regulated output supply voltage (Vout), the third terminal being coupled to receive a regulator control voltage, the voltage regulator comprising: a bias circuit comprising: a first resistor having a first terminal and a second terminal, the first terminal of the first resistor being coupled to the third terminal of the voltage regulator and being coupled to receive the regulator control voltage; a second resistor having a first terminal and a second terminal, the first terminal of the second resistor being coupled to the second terminal of the first resistor, the second terminal of the second resistor being coupled to a ground potential; and a third resistor having a first terminal and a second terminal, the first terminal of the third resistor being coupled to the second terminal of the first resistor and the first terminal of the second resistor, the second terminal of the third resistor being coupled to the input supply voltage; and a summing circuit having a first terminal, a second terminal, a third terminal, a fourth terminal and a fifth terminal, the first terminal of the summing circuit, forming a first input of the summing circuit, being coupled to the second terminal of the first resistor and the first terminal of the second resistor and the first terminal of the third resistor, the second terminal of the summing circuit, forming a second input of the summing circuit, being coupled to the third terminal of the summing circuit, forming an output of the summing circuit to provide the regulated output supply voltage responsive to the regulator control voltage and the input supply voltage, the fourth terminal of the summing circuit, forming a third input of the summing circuit, being coupled to the input supply voltage, the fifth terminal of the summing circuit being coupled to the ground potential.