Design of a Current-Mode Sample-and-Hold Circuit Based on CCCⅡ

This paper proposed a novel current controlled second generation current conveyor (CCCⅡ).The CCCⅡ is based on translinear loop of compound CMOS transistors, which adjust the parasitic resistance with the outside biasing current I_B.When the biasing current I_B is 10 μA, the parasitic resistance of terminal X is 2.16 kΩ.The error compared with the theoretical value is only 1.32%.Based on this CCCⅡ, a current mode sample-and-hold circuit is proposed.When the frequency of the sampling clock signal is 100 MHz, the circuit can achieve excellent sampling accuracy in TSMC 0.18 μm CMOS process.The working principle of the circuit is discussed, and the simulation results confirm the theory analysis.