Design of W-band ultra-high sensitivity receiver

The detection of weak signals submerged in noise is still a difficult problem in the field of signal detection. Researches on the detection of W-band weak signals at a level of -125dBm is carried out in this paper. Based on the composition and operational principle of a W-band ultra-high sensitivity receiver, the analysis and computation on how to improve the signal-to-noise improvement ratio, the choice of effective bandwidth resolution, the time spent on scanning and the frequency measurement error are investigated. The adoption of two stages of low-noise amplifiers at W-band guarantees a significant performance of the front-end, and the method of sweeping channelization ensures that the effective bandwidth achieves a resolution of 2 KHz, so the receiver can realize a sensitivity of -125dBm. Ultimately, the sensitivity is tested by approach of space attenuation with a W-band reference source, and the validity of this design is verified by some actual experimental results.