Применение нелинейного функционального аналого-цифрового преобразования для прецизионных измерений малых электрических величин

Precision measurement of the small-signal parameters for embedded electronics inside real-time systems is actually today. Application of the non-linear measurement scales permits to achieve many opportunities versus linear case for embedded electronics. At first, decreasing of the full relative error of measurements. At work it is proved that for special case of non-linear functional scale (N = kXn ) at n < 1 full relative error less than for linear scale, i.e. at n = 1. The hardware model of nonlinear measuring channel was developed and experiments with nanoampere current source were carrying out. The main results of these experiments confirm theoretical assumptions about order of errors. Besides this model is able to work into wide range of value of input currents, this range is 1000 – from 1 nA to 1 μA. Our method and circuitry for non-linear small current measurements may base for future VLSI multichannel meters inside service electronics of inertial sensors.

1. Aaltonen, L. Integrated Interface Electronics for Capacitive MEMS Inertial Sensors// Doct. Diss., Aalto Univ., Sc. Sci. Tech., Fac. Electr., Comm. Autom., Dep. Micro Nanosci., 2010. – 152 p.

2. Boyde, E. and oth. A High-Performance Tunneling Accelerometer//Term Project 6.777, Introduction to Microelectromechanical Systems, Spring 1999, MIT Media Lab. – 58 p.

3. Osaki, Yuji, Hirose, Tetsuya, Kuroki, Nobutaka, and Numa, Masahiro. Temperature-Compensated Nano-Ampere Current Reference Circuit with Subthreshold Metal–Oxide–Semiconductor Field-Effect Transistor Resistor Ladder//Jpn. J. Appl. Phys., pp. 04DE08-1 – 6.

4. Linares-Barranco, B., Serrano-Gotarredona, T., Serrano-Gotarredona, R., Serrano-Gotarredona, C. Current Mode Techniques for Sub-pico-Ampere Circuit Design. Analog Integrated Circuits and Signal Processing, 38, 103–119, 2004.

5. Digital Processors Limited by Power; What’s the PSIDE? /http://www.darpa.mil/NewsEvents/Releases/2012/08/24.aspx /

6. Гельман, М.М. Системные аналого-цифровые преобразователи и процессоры сигналов / М.: Мир, 1999. - 559 с.