Title :
An adjustable CMOS floating resistor
Author :
Wang, Li ; Newcomb, Robert W.
Author_Institution :
Electr. & Comput. Eng. Dept., Univ. of Maryland, College Park, MD
Abstract :
A floating node resistor has a wide range of usage in analog integrated circuits. In this paper, we propose a new CMOS linear floating resistor circuit which is based on a transconductor circuit. The proposed 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. PSpice simulation results show that the example circuit made by AMI 1.5 mum CMOS process presents a constant resistance of 2.6 MOmega to 5.1 MOmega when the adjust voltage ranges from -3.4 V to -2.4 V and the corresponding adjusted current is 16 muA to 57 muA, with plusmn5V voltage supplies. The cutoff frequency is about 1 MHz.
Keywords :
CMOS integrated circuits; MOSFET; SPICE; resistors; MOS transistor; PSpice simulation; adjustable CMOS integrated circuits; analog integrated circuits; circuit implementation; circuit topology; floating node resistor; gate voltage; linear floating resistor circuit; size 1.5 mum; transconductor circuit; Ambient intelligence; Analog integrated circuits; CMOS process; Circuit simulation; Circuit topology; MOSFETs; Resistors; Transconductors; Tunable circuits and devices; Voltage;
Conference_Titel :
Circuits and Systems, 2008. ISCAS 2008. IEEE International Symposium on
Conference_Location :
Seattle, WA
Print_ISBN :
978-1-4244-1683-7
Electronic_ISBN :
978-1-4244-1684-4
DOI :
10.1109/ISCAS.2008.4541766
