Resistorless switched‐capacitor bandgap voltage reference with low sensitivity to process variations

2013 ◽  
Vol 49 (23) ◽  
pp. 1448-1449 ◽  
Author(s):  
H. Klimach ◽  
A.L.T. Costa ◽  
M.F.C. Monteiro ◽  
S. Bampi
Keyword(s):  
Process Variations ◽  
Switched Capacitor ◽  
Voltage Reference ◽  
Bandgap Voltage Reference ◽  
Low Sensitivity

A New Sub-1 Volt 17ppm/°C Offset-Insensitive Resistorless Switched-Capacitor Bandgap Voltage Reference

2020 ◽  
pp. 2150029
Author(s):  
Emad Ebrahimi ◽  
Maliheh Arabnasery
Keyword(s):  
Process Variations ◽  
Voltage Divider ◽  
Cmos Technology ◽  
Reference Voltage ◽  
Cmos Process ◽  
Switched Capacitor ◽  
Voltage Reference ◽  
Op Amp ◽  
Offset Voltage ◽  
Bandgap Voltage Reference

A new PVT compensated voltage reference is presented by using switched-capacitor (S.C.) technique. In the proposed bandgap voltage reference (BGR), a p–n junction is biased with different currents during two different phases and required PTAT and CTAT voltages generated and held by two capacitors. Using a capacitive voltage divider, the PTAT voltage is weighted such that the sub-1V bandgap voltage is achievable. In order to cancel the effect of op-amp offset and to relax the design of op-amp, the offset voltage of the op-amp is sampled by a capacitor during a specified phase and inversely is added to the final bandgap voltage in next phase. The analysis of the proposed S.C. BGR is supplemented by simulation of a 0.5-V BGR with 28[Formula: see text][Formula: see text][Formula: see text]W power consumption in a standard 0.18[Formula: see text][Formula: see text][Formula: see text]m CMOS technology. Simulation results show that the average temperature coefficient of the S.C. BGR is 17[Formula: see text]ppm/∘C and it is robust against the process variations. Applying an arbitrary 100-mV op-amp offset results in a lower than 1.1[Formula: see text]mV deviation in generated reference voltage. Due to the better matching of MIM capacitors in CMOS process (rather than resistors used in conventional BGR) the proposed S.C. bandgap provides good accuracy without any post trimming. Monte–Carlo analysis shows that [Formula: see text]/[Formula: see text] of the generated reference voltage is as low as 0.7%. The sensitivity of the proposed BGR to supply variation is also less than 1%/V.

scholarly journals Switched capacitor bandgap voltage reference for sub-1-V operation

2006 ◽  
Vol 3 (24) ◽  
pp. 529-533 ◽  
Author(s):  
Suheng Chen ◽  
Benjamin J. Blalock
Keyword(s):  
Switched Capacitor ◽  
Voltage Reference ◽  
Bandgap Voltage Reference

A High PSRR Bandgap Voltage Reference with Virtually Diode-Connected MOS Transistors

2010 ◽  
Vol E93-C (12) ◽  
pp. 1708-1712 ◽  
Author(s):  
Kianoush SOURI ◽  
Hossein SHAMSI ◽  
Mehrshad KAZEMI ◽  
Kamran SOURI
Keyword(s):  
Voltage Reference ◽  
Mos Transistors ◽  
Bandgap Voltage Reference
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