Abstract: A broadband and linear group delay circuit, which is based on the different kinds of all-pass filters cascade, is proposed to realize full electronic temporal imaging. The group delay circuit has low insertion, high linearity and high group delay slope. Two full electronic temporal imaging systems are realized by using this kind of the group delay circuit and the proper linear chirp pulse in this paper. The two temporal imaging systems can time reverse and broaden an arbitrary waveform signal with 40 ns duration and 0.8 GHz band width, respectively. These two systems are simulated and the results show that the two temporal imaging systems have high image quality. The correlational analyses indicate that the correlation coefficients between the input and output is greater than 0.97.