2011
EMSS 2011 Proceeding
Controllable Equivalent Resistance CMOS Active Resistor with Improved Accuracy and Increased Frequency Response
Authors: Cosmin Popa
Abstract
A new active resistor circuit will be further presented. The main advantages of the original proposed implementation are the improved linearity, the small area consumption and the improved frequency response. An original technique for linearizing the )(VI characteristic of the active resistor will be proposed, based on the simulation of the Ohm law using two linearized differential amplifiers, a multiplier and a current-pass circuit. The controllability of the active resistor circuit is excellent, existing the possibility of modifying the value of the equivalent resistance by changing the ratio between a control voltage and a control current. Additionally, the value of the simulated resistance is not function on technological parameters, with the result of improved circuit accuracy. The errors introduced by the second- order effects will be also strongly reduced, while the area consumption of the active resistor will be minimized by replacing the classical MOS transistor with FGMOS (Floating Gate MOS) devices.
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