The invention relates to a device for multichannel analog detection of a signal to be detected having a very good signal/noise ratio. It incorporates a modulator (53) producing a modulated signal S(P); means of synchronous attenuation (54) of variable phase .PHI. producing an attenuated modulated signal; a multipoint receiver (52) receiving the modulated-attenuated signal and producing for each point a primary analog signal; an integrator producing for each point a value V(P,.PHI.) resulting from the integration over N periods of the primary analog signal; means of reading, of digitizing and of storing the values V(P,.PHI.) for a given .PHI. value; a phase sequencer giving .PHI. the values .PHI..sub.0 +i2.pi./n successively where i is an integer varying from 1 to n; a digital processing unit making it possible to obtain data representative of S(P) from the values V(P,.PHI.). It is particularly well adapted to the detection of a luminous flux with an array of photodiodes.