Photodetector circuit

A photodiode circuit, comprising:

• a transimpedance amplifier;
• a resistor coupled across the transimpedance amplifier;
• and
• an amplifier stage coupled to receive an output from the transimpedance amplifier,
• wherein the photodiode circuit provides dynamic range across a current range of the photodiode circuit,
• wherein the transimpedance amplifier includes a receive signal strength indicator that provides a DC current signal to a tail of a first amplifier stage, the tail providing a current that is adaptively related to the DC current, the first amplifier stage comprising:
• a first transistor with base coupled to receive an output signal from the transimpedance amplifier, the emitter of the first transistor coupled through a first resistor to a current source;
• and
• a second transistor with base coupled to a reference signal, the emitter of the second transistor coupled through a second resistor to the current source,
• wherein the current source provides a current linearly related to the DC current signal from the receive signal strength indicator.