Patent ID: 8149052

Claim:
A transconductor circuit comprising: an output transconductor having a control input and an output responsive to the signal at the control input, and a predistortion circuit comprising: a control input, a model transconductor, having an input voltage to output current characteristic where the output current is related to that of the output transconductor by a constant factor, which factor includes a factor of one, and having a control input and an output responsive to the signal at its control input, a feedback network that is connected to receive the signal at the control input to the predistortion circuit, that has a feedback input connected to receive a feedback signal indicative of the signal output from the output of the model transconductor, and has a control output connected to supply a transconductor control signal to the control input of the model transconductor and to the control input of the output transconductor, and that is responsive to the signal from the control input to the predistortion circuit and to the feedback signal indicative of the signal output from the output of the model transconductor, in providing the transconductor control signal, to control the output of the model transconductor to be linear with respect to the signal at the control input of the predistortion circuit, and a conditioner circuit having an input connected to receive the transconductor control signal and an output connected to provide a conditioned version of that signal to the output transconductor, wherein the model transconductor is connected to receive the transconductor control signal before it is passed through the conditioner circuit.