Method and system for demodulating signals

A demodulation sensor for detecting and demodulating a modulated radiation field impinging on a substrate, the sensor comprising:

• means for generating, in the substrate, a static majority current assisted drift field;
• at least one gate structure for collecting and accumulating minority carriers, the minority carriers being generated in the substrate by the impinging radiation field, the at least one gate structure comprising at least two regions for the collection and accumulation of the minority carriers and at least one gate adapted for inducing a lateral electric drift field under the gate structure, the system thus being adapted for directing the minority carriers towards one of the at least two regions for the collection and accumulation of the minority carriers under influence of the static majority current assisted drift field and the lateral electric drift field induced by the gate structure, and
• means for reading out the accumulated minority carriers in that region.

The demodulation sensor according to claim 1, wherein the shutter mode can be used as a conventional (non-demodulating) image sensor.