METHOD AND CIRCUIT FOR READING FREQUENCIES IN AN ARRAY OF OSCILLATORS

摘要

The invention concerns a detection device having: an array of pixels, each pixel including a sensor and generating an oscillating signal (S); and a frequency detection circuit (206, 208, 210) for detecting the frequency of the oscillating output signal of one or more of the pixels, the frequency detection circuit having: a window generation circuit (208) adapted to generate at least one output signal (WIN SEN) indicating the start and end times of a first time duration (T WINDOW ) corresponding to a plurality of periods of the oscillating output signal; and one or more counters (210) adapted to receive at least one reference signal (TCOUNT, TREAD) indicating the start and end times of a reference time duration (T REF ), and to quantify a difference between the first time duration and the reference time duration.