Publication detail

The CMOS Highly Linear Current Amplifier with Current Controlled Gain for Sensor Measurement Applications

PROKOP, R. ŠOTNER, R. KLEDROWETZ, V.

Original Title

The CMOS Highly Linear Current Amplifier with Current Controlled Gain for Sensor Measurement Applications

Type

journal article in Web of Science

Language

English

Original Abstract

This paper introduces a new current-controlled current-amplifier suitable for precise measurement applications. This amplifier was developed with strong emphasis on linearity leading to low total harmonic distortion (THD) of the output signal, and on linearity of the gain control. The presented circuit is characterized by low input and high output impedances. Current consumption is significantly smaller than with conventional quadratic current multipliers and is comparable in order to the maximum processed input current, which is +/- 200 mu A. This circuit is supposed to be used in many sensor applications, as well as a precise current multiplier for general analog current signal processing. The presented amplifier (current multiplier) was designed by an uncommon topology based on linear sub-blocks using MOS transistors working in their linear region. The described circuit was designed and fabricated in a C035 I3T25 0.35-mu m ON Semiconductor process because of the demand of the intended application for higher supply voltage. Nevertheless, the topology is suitable also for modern smaller CMOS technologies and lower supply voltages. The performance of the circuit was verified by laboratory measurement with parameters comparable to the Cadence simulation results and presented here.

Keywords

current amplifier; current controlled gain; accuracy; linearity; CMOS; electronic control; sensor signal processing

Authors

PROKOP, R.; ŠOTNER, R.; KLEDROWETZ, V.

Released

18. 8. 2020

Publisher

MDPI

Location

Basel, Switzerland

ISBN

1424-8220

Periodical

SENSORS

Year of study

20

Number

16

State

Swiss Confederation

Pages from

1

Pages to

23

Pages count

23

URL

https://www.mdpi.com/1424-8220/20/16/4653/htm

Full text in the Digital Library

http://hdl.handle.net/11012/195244

BibTex

@article{BUT165501,
  author="Roman {Prokop} and Roman {Šotner} and Vilém {Kledrowetz}",
  title="The CMOS Highly Linear Current Amplifier with Current Controlled Gain for Sensor Measurement Applications",
  journal="SENSORS",
  year="2020",
  volume="20",
  number="16",
  pages="1--23",
  doi="10.3390/s20164653",
  issn="1424-8220",
  url="https://www.mdpi.com/1424-8220/20/16/4653/htm"
}