Low voltage, low power (5:2) compressor cell for fast arithmetic circuits

This paper presents a new (5:2) compressor circuit capable of operating at ultra-low voltages. Its power efficacy is derived from the novel design of composite XOR-XNOR gate at transistor level. The new circuit eliminates the weak logic and threshold voltage drop problems, which are the main factors limiting the performance of pass transistor based circuits at low supply voltages. The proposed (5:2) compressor has been designed with special consideration on output drivability to ensure that it can function reliably at low voltages when these cells are employed in the tree structured multiplier and multiply-accumulator. Simulation results show that the proposed (5:2) compressor is able to function at supply voltage as low as 0.7 V, and. outperforms other (5:2) compressors constructed with various combinations of recently reported superior low-power logic cells.