A novel digitally controlled CMOS current follower for low voltage low power applications

In this paper fully differential digitally controlled analog library cells are given. The proposed cells are based on a novel digitally controlled current follower (DCCF) circuit. The proposed circuits are useful for low voltage low power high frequency applications. The DCCF operates from a 3 V supply in class AB mode and provides a bandwidth of 80 MHz in 1.2 μm CMOS technology. Owing to the class AB operation of the DCCF circuit the standby current is below 94 μA. The proposed circuit is used to realize digitally controlled weighted sum transconductors and MOSFET-C filters. APLAC simulations based on the AMI 1.2 μm n-well level 3 parameters are in agreement with the presented work