Start-up circuit arranged to initialize a circuit portion

A start-up circuit arranged to initialize a circuit portion with a zero stable point and a non-zero stable point, the start-up circuit comprising:

• a capacitive voltage divider including a first capacitor in series with a second capacitor that generates a divider bias voltage between said first and second capacitors at a divider node;
• a differential amplifier including a first amplifier input, a second amplifier input, and an amplifier output connected to the divider node;
• a first driver transistor arranged such that a gate terminal of the first driver transistor is connected to the divider node, and a drain terminal of the first driver transistor is connected to both a first start-up output and the first amplifier input;
• and
• a second driver transistor arranged such that a gate terminal of the second driver transistor is connected to the divider node, and a drain terminal of the second driver transistor is connected to both a second start-up output and the second amplifier input;
• wherein the start-up circuit is arranged such that the differential amplifier controls the divider bias voltage and drives the circuit portion to the non-zero stable point.