Novel and Efficient 4: 2 and 5: 2 Compressors with Minimum Number of Transistors Designed for Low-Power Operations

This paper proposes efficient and optimal 4:2 and 5:2 compressors. The compressors are highly optimized in terms of transistor count. These designs have the principle advantage that in addition to reduced transition activity, they have no direct connections to the power-supply and is totally driven by the input signals, leading to a noticeable reduction in short-circuit power consumption. The proposed 4-2 and 5-2 compressor designs have been implemented with a bare minimum of 20 and 30 transistors respectively.