Low-cost multi-channel testing of periodic signals using monobit receivers and incoherent subsampling

Abstract

This paper proposes a new method to reconstruct signal by a monobit receiver based on incoherent subsampling. The proposed method uses a time-variant threshold voltage for the monobit receiver to increase its amplitude resolution. By our methodology, the threshold voltage does not have to be synchronized with the input signal nor the sampling clock of the system. Hardware measurement with FPGA and high-bandwidth clocked-comparators shows that a low-cost multi-channel test is achievable by our method. The hardware measurement results show a square waveform and a sine wave waveform reconstruction.