Analog-digital converter for a signal in the gigahertz range, millimeter wave receiver and bandpass filter for millimeter waves

摘要

The invention relates to an analog-to-digital converter for a signal in the gigahertz range, to a millimetric wave receiver comprising the inventive analog-to-digital converter for a signal in the gigahertz range and to a bandpass filter for millimetric waves. The inventive analog-to-digital converter comprises a signal input for receiving an analog signal in the gigahertz range and a tridimensional filter to which the input analog signal is transmitted and which is characterised by a mean frequency f0 and a bandwidth B. Said analog-to-digital converter also comprises a sample-and-hold stage which oversamples the analog signal in a band restricted manner, whereby the Nyquist condition is verified, and a comparator for generating the digital signal, which follows the sample-and-hold stage and transmits the digital signal to a signal output. The inventive analog-to-digital converter allows for the conversion of signals in the gigahertz range into signals of a frequency range which can be directly submitted to a digital signal processing. Thus, the invention provides for a highly cost effective converter characterised by a low sensitivity to interference.