Realization of ASK/BPSK Modulators and Precision Full-Wave Rectifier using DXCCII

Abstract

This paper introduces two new circuits which are capable of realizing digital modulation schemes namely, amplitude shift keying (ASK) and binary phase shift keying (BPSK). First circuit named as ASK/BPSK modulator-1 employs one dual-X second generation current conveyor (DXCCII), three MOS switches and three resistors. On the other hand, second circuit named as ASK/BPSK modulator-2 comprises one DXCCII, three MOS switches and one grounded resistor. Both ASK and BPSK schemes are simultaneously realizable with both proposed circuits. In communication systems, both ASK and BPSK schemes are commonly used. Furthermore, a little modification in ASK/BPSK modulator-1 enables the realization of full-wave precision rectifier. The circuit of rectifier comprises one DXCCII, two resistors and two MOS switches. The non-ideal considerations of proposed circuits including non-ideal transfer gains as well as parasitic of DXCCII are also explored. HSPICE simulation results using 0.13 µm process parameters of IBM CMOS technology are given to validate proposed circuits.