If you need a voltage reference when doing energy harvesting it is very helpful have a band gap reference that uses very little current. Â This topology uses “Self Cascode Mosfet” Â abreviated as SCM. Â The LTSPICE design uses 4.5 nano Amperes and outputs a 0.6 Volt reference voltage.
Research Links
- REFERENCIA-DE-CORRENTE-CMOS-PARA-APLICACOES-DE-ULTRABAIXO-CONSUMO-DE-POTENCIAÂ – this is a master thesis in Portuguese but you should be able to understand most of it from the equations and diagrams
- A-2-nW-1.1-V-Self-Biased-Current-Reference-in-CMOS-Technology
- 0p9-V-5-nW-9-ppm-per-deg-C-Resistorless-Sub-Bandgap-Voltage-Reference-in-0.18μm-CMOS
- Presentation Level: 0p9-V-5-nW-9-ppm-per-deg-C-Resistorless-Sub-Bandgap-Voltage-Reference-in-0.18μm-CMOS
- 0p7-V-Supply-8-nW,-8-ppm-per-degC-Resistorless-SubBandgap-Voltage-Reference
- A Low Voltage CMOS Band Gap Reference – talks about the self cascode MOSFET
|   Archive: Voltage-Reference.7z   Program = LTSPICE
Extract into directory. Â Includes the required MOSFET library file. |
LTSPICE Analysis
Vref versus Temperature
Voltage reference current consumption versus temperature
Monte Carlo Analysis with Cadence
- Â Note how tight the voltage control is
- Current usage = 1 nAmpere
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