Low-Voltage Transconductor and its Applications

Abstract

In this thesis, a CMOS linear floating resistor circuit is presented which is based on a transconductor circuit. The circuit topology is capable of implementing both positive and negative resistance. The introduced floating resistor has simple circuit implementation and its resistance is tunable by adjusting the gate voltage of a MOS transistor. The floating resistor has been simulated using Cadence Spectre analog simulation environment with BSIM3v3 version 3.2 model parameters. The simulation results show that the floating resistor presents a constant resistance of 0.87MΩ to 1.86MΩ when the adjusted voltage ranges from -380mV to -200mV and the corresponding adjusted current is 1µA to 5µA, with ±0.9V voltage supplies. The cutoff frequency is about 1MHz.