1. A high-accuracy linear amplifier for sinking or sourcing current to or from a load, said linear amplifier including: input circuitry for receiving a predetermined input signal; rectifier circuitry disposed at the output of said input circuitry and operative in response to said input signal to generate a source/sink command signal; output stage circuitry coupled to said rectifier circuitry and including a current sink transistor and a current source transistor, said output stage circuitry responsive to said command signal to sink or source current through one of said respective transistors; feedback circuitry coupled between the output of said output stage circuitry and said input circuitry to provide an error signal for modifying said input signal; and bias circuitry to maintain the non-conducting transistor in an on state during the sourcing or sinking of current.