Patent ID: 6753724
Filing Date: 2004-06-22
Classification: G05F

Abstract:
A current source with a current source output, capable of driving a large capacitive load and capable of driving Printed Wiring Board signal lines, and maintaining high impedance over a wide range of voltage at said output, comprising:a voltage control mechanism with a voltage control input and a voltage control output, the voltage control mechanism further comprising: a voltage reference having a voltage reference output; a low-gain differential amplifier having a first input coupled to said voltage reference output, a second input coupled to said current source output, and at least one amplifier output; and a voltage feedback circuit coupled to at least one of said amplifier outputs and further coupled to said voltage control output; and a driver having a driver input coupled to said voltage control output, and a driver output coupled to said voltage control input and said current source output, said driver output producing a current responsive to a voltage applied to said driver input current.