Abstract: The signal quality can be affected by the output signal-to-noise ratio (SNR) of the wide-band digital T/R module, a lower SNR will result in a higher bit error rate when the signal is received. Through the noise analysis of each circuit in the transmission link of the T/R module, the relationship between the decrease of the SNR and noise figure can be acquired, which can quantitatively guide the design of the transmission link. In addition, the shallow saturation power amplifier is analyzed, and a digital predistortion solution suitable for T/R module is proposed, which has great significance to the design of wide-band digital T/R module transmission link.