Current Controlled MOS Current Mode Logic with Auto-detection of Threshold Voltage Fluctuation

摘要

A Current Controlled (CC-) MOS Current Mode Logic (MCML) circuit based on auto-detection of threshold voltage (Vth) fluctuation is proposed. This proposed circuit suppresses the degradation of circuit performance induced by the Vth fluctuations of the transistors automatically, by detecting the Vth fluctuations of the transistor. When the Vth fluctuation over ±0.1V occurs on the pair transistors of the circuit, the minimum value of the dc gain is increased by about 111 times by using the proposed circuit. Furthermore, it is shown that the maximum operating frequency of the circuit is increased from 0 GHz to 24.8 GHz when the Vth fluctuation of ±0.1 V occurs in the transistors of the circuit, by using the proposed new circuit technology.