A 1.5-V BOOTSTRAPPED PASS-TRANSISTOR-BASED MANCHESTER CARRY CHAIN CIRCUIT SUITABLE FOR IMPLEMENTING LOW-VOLTAGE CARRY LOOK-AHEAD ADDERS

This paper reports a 1.5-V bootstrapped pass-transistor-based Manchest er carry chain circuit suitable for implementing low-voltage carry loo k-ahead adders, As verified by the experimentally measured data from a test chip fabricated using a 0.8-mu m single-poly;double-metal CMOS t echnology,,vith the bootstrapped pass-transistor-based Manchester tarr y chain circuit technique, the speed performance of a 16-bit carry loo k-ahead adder circuit is enhanced by 56% at a supply voltage of 1.5 V as compared to the adder using the conventional Manchester carry chain circuit.