CHARGE TRANSFER CIRCUIT FOR COMPACT MODULATORS

The present disclosure provides a current generation circuit. In one aspect, the circuit includes a current source transistor and a current sink transistor connected to the current source transistor in series, with respective sources of the current source and sink transistors being connected with each other at a common node. A voltage difference between respective gates of the current source and sink transistors defines a current value flowing through the series, the voltage difference being variable such that the current value is either time-dependent or time-independent. Respective drains of the current source and sink transistors provide a high resistance output necessary to provide a current source or sink function thereby rejecting influence of drain variation or error on the current value.