Due to the limitation of Ft of integrated circuit technologies,the method of directly obtaining THz signals source through fundamental oscillator has problems of low output power and narrow bandwidth.A wideband frequency quadrupler chain for high performance THz signal sources is proposed to solve these problems.The improved gm-boosted push-push technology is compared with the traditional push-push technology and applied to frequency multipliers to improve the conversion gain of the frequency quadrupler chain.A novel active balun with amplitude and phase correction technique is adopted in the frequency quadrupler chain to further improve the conversion gain and harmonic suppression.The simulation results show that the 3 dB bandwidth of the quadrupler chain is 210~256 GHz,the saturated output power is -0.5 dBm,the peak conversion gain is -0.55 dB and the dc power consumption is 30.6 mW.