Low-Voltage Low-Power CMOS-Based Current-Mode Implementation of Digital Logic Gates and Combinational Circuits

In this paper, a new low-voltage low-power circuit is introduced for implementing CMOS-based basic logic functions using the analog current-mode techniques. The logic functions have been realized by using their expansion in Power Series representation, a Squaring circuit and a Geometric Mean circuit. To illustrate the proposed method, simultaneous realization of the basic logic functions NOT, OR, AND, XOR, NOR, NAND and XNOR in a single circuit is considered. Furthermore, these functions have been used to realize various combinational circuits including full-adder, full-subtractor, etc. SPICE simulation results, obtained with 1.5-V supply, are included.