Ambient light sensor and method

An apparatus comprising:

• an ambient-light sensor comprising:
• a photodiode configured to generate an electrical signal according to an ambient light;
• a capacitive-feedback transimpedance amplifier having an input connected to the photodiode for receiving the electrical signal generated by the photodiode, and having an output for generating an amplified signal from the electrical signal generated by the photodiode;
• an auto-zero switch connected to the input of the capacitive-feedback transimpedance amplifier;
• and
• a control circuit comprising a bootstrap circuit configured to:
• receive an initial logic control signal, wherein the initial logic control signal is a positive- or zero-voltage logic control signal;
• and
• generate, from the initial logic control signal, an adapted logic control signal having a first positive voltage level and a second negative voltage control level for controlling the auto-zero switch;
• and
• a screen configured to adapt a brightness of the screen to the ambient light in accordance with the amplified signal.

A method comprising:

• generating, by a photodiode, an electrical signal according to an ambient light;
• receiving, by an input of a capacitive-feedback transimpedance amplifier, the electrical signal generated by the photodiode;
• generating, by the capacitive-feedback transimpedance amplifier according to the electrical signal, an amplified signal at an output of the capacitive-feedback transimpedance amplifier;
• receiving, by a bootstrap circuit of a control circuit, an initial logic control signal, the initial logic control signal being a positive- or zero-voltage logic control signal;
• and
• generating, by the bootstrap circuit from the initial logic control signal, an adapted logic control signal having a first positive voltage level and a second negative voltage control level for controlling an auto-zero switch connected to the input of the capacitive-feedback transimpedance amplifier.