Method and apparatus for generating a charge pump control signal

A charge pump driver circuit arranged to output a charge pump control voltage signal, the charge pump driver circuit comprising:

• a bias current source component arranged to generate a bias current;
• a control stage coupled to the bias current source component and arranged to receive the bias current, the control stage is further arranged to receive an input signal and to generate a control current signal proportional to the bias current in accordance with the input signal, wherein the control stage is configured to output current pulses having a constant amplitude ratio with the bias current;
• and
• an output stage arranged to receive the control current signal generated by the control stage and to generate the charge pump control voltage signal based on the control current signal generated by the control stage,
• wherein the bias current source component is arranged to vary the bias current in response to variations in temperature, and the bias current has a multi-region temperature profile having a lower temperature profile region comprising a linear temperature invariant slope and an upper temperature profile region comprising a linear negative slope, wherein the lower temperature profile region extends below a first temperature, and the upper temperature profile region extends above the first temperature.