An analog front-end circuit includes an array of pixel circuits. Each pixel circuit includes an event counter and a power consumption circuit. The event counter is configured to count photons incident at the pixel circuit. The power compensation circuit includes an event rate circuit and a current sink circuit. The event rate circuit is configured to determine a rate of photon detection events at the pixel circuit. The current sink circuit is configured to pass a compensation current selected based on the rate of photon detection events at the pixel circuit.