Patent ID: 6765417
Filing Date: 2004-07-20
Classification: G05F

Abstract:
A method for converting a voltage input signal to a current output signal, comprising:providing a converter having an input for receiving an analog input signal and a plurality of comparators for comparing the analog input signal directly or indirectly to a plurality of reference signals; providing a plurality of reference signals corresponding to each of the plurality of comparators to vary the Gm; and providing a parabolic impedance network, the network including a bank of resistors, a plurality of nodes occurring between each resistor and a plurality of current sources, where each current source corresponds to each node, wherein each resistor and corresponding current source is configured to create an individual voltage reference having a value that occurs in a parabolic manner in relation to other voltage references occurring across the impedance network, and further comprising varying the current input to the resistor to vary the Gm.