Adisak Monpapassorn

CMOS dual output current mode half-wave rectifier

A CMOS dual output current mode half-wave rectifier is presented. The proposed rectifier is composed of three main components: a dual output V–I converter, two half-wave current rectifiers and two I–V converters. A voltage input signal is changed into two current signals by the V–I converter. The current rectifiers rectify these current signals, resulting in positive and negative half-wave current signals that are converted to positive and negative half-wave voltage signals by the I-Vconverters. The theory of operation is described, and the simulated results obtained from the PSPICE program are used to verify the theoretical prediction. Simulated rectifier performance with a 0.5μm MOSFET model using ±1.2V supply voltage demonstrates good rectifier integrity at operating frequencies up to 100MHz.

An analogue switch using a current conveyor

An analogue switch using a current conveyor CCII–7 is presented. The proposed switch can simulate a true switch with transfer of both voltage and current. A theory of operation is described. The proposed switch is verified by using the PSPICE program with a 0.5 μm MOSFET model from MIETEC. Simulation results show that the proposed switch yields an operational range between −300 mV and 300 mV with a supply voltage of ±1.2 V and a load resistor of 100 kΩ. An error in this range is lower than 2%. Switching of a 1 MHz sine wave is also shown.

Low output impedance dual CCII full-wave rectifier

This article describes the design of a low output impedance dual CCII full-wave rectifier. The proposed dual CCII rectifier yields lower output impedance than the dual CCII full-wave rectifiers proposed previously. The node-Z output of the CCII directly drives the load (R L ). The forward resistance and the threshold voltage of diodes are cancelled from the output. Thus the proposed dual CCII rectifier is better for driving loads with lower output impedance and higher output voltage. The proposed rectifier is verified by using the PSPICE program with the CCII in AD844 IC from Analog Devices. The result demonstrates the accurate operation of the proposed rectifier.