Patent ID: 6388507
Filing Date: 2002-05-14
Classification: G05F

Abstract:
A voltage controlled current source circuit comprising:a first transistor having a control terminal coupled to a control voltage, a first terminal, and a second terminal; a first resistor; a first current mirror having a current terminal coupled to a first terminal of the first resistor, wherein the first current mirror generates a first reference current; a first voltage controlled impedance circuit having a current input and a first voltage control input; a second current mirror having a current terminal coupled to the current input of the voltage controlled impedance, wherein the second current mirror generates a second reference current; and a second voltage controlled impedance circuit having a current input coupled to the second terminal of the first transistor, and a second voltage control input; wherein the first reference current and the second reference current are coupled together at a voltage control node, and wherein the first and second voltage control inputs are coupled to the voltage control node.