DocumentCode :
1886417
Title :
A resistorless switched bandgap voltage reference with offset cancellation
Author :
Klimach, Hamilton ; Liraneto Torres Costa, Arthur ; Fernandes Cortinhas Monteiro, Moacir ; Bampi, Sergio
Author_Institution :
Dept. de Eng. Eletr., PGMicro, Univ. Fed. do Rio Grande do Sul, Porto Alegre, Brazil
fYear :
2013
fDate :
2-6 Sept. 2013
Firstpage :
1
Lastpage :
5
Abstract :
This work presents a novel Switched-capacitor Bandgap Voltage Reference (SCBGR) circuit that dispenses entirely the use of resistors. The vEB negative drift and the thermal voltage (VT) positive drift voltages are both generated by the same PNP vertical bipolar transistor, avoiding diode mismatch problems. The current sources that are used to generate different junction current densities are averaged in the switching process, reducing their mismatch impact on the circuit performance. A switched-capacitor circuit stores and processes these voltages, generating the bandgap reference voltage after 5 clock cycles. Since capacitors are used instead of resistors, variability problems like average process spread and device mismatches are reduced. The proposed topology was designed and simulated in CMOS for 180 nm process. This paper presents a systematic comparison to the traditional dual-BJT BGR and demonstrates the better performance of this new topology with respect to the former. Monte Carlo simulation shows significantly lower spread resulting from variations in the output reference voltage and in its temperature coefficient (TC).
Keywords :
CMOS integrated circuits; Monte Carlo methods; reference circuits; CMOS process; Monte Carlo simulation; PNP vertical bipolar transistor; SCBGR circuit; TC; capacitors; current sources; diode mismatch problems; dual-BJT BGR; junction current density; negative drift; offset cancellation; positive drift voltages; resistorless switched bandgap voltage reference circuit; size 180 nm; switched-capacitor circuit; switching process; temperature coefficient; thermal voltage; Capacitors; Junctions; Monte Carlo methods; Photonic band gap; Resistors; Switches; Topology;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Integrated Circuits and Systems Design (SBCCI), 2013 26th Symposium on
Conference_Location :
Curitiba
Type :
conf
DOI :
10.1109/SBCCI.2013.6644882
Filename :
6644882
Link To Document :
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