Learn How To Maximize Dynamic Range in Spectroscopy Systems

Precision instrumentation systems that measure physical properties using a photodiode or other current-output sensor often include a transimpedance amplifier (TIA) and a programmable-gain stage to maximize dynamic range. This article uses a real-world example to show the benefits and challenges of implementing a single-stage programmable-gain TIA to minimize noise while maintaining high bandwidth and high accuracy.

Transimpedance amplifiers are essential building blocks in any system that measures light. Many chemical analysis instruments, such as ultraviolet-visible (UV-VIS) or Fourier transform-infrared
(FT-IR) spectroscopes, rely on photodiodes to accurately identify chemical compounds. These systems must measure a wide range of light intensity. For example, a UV-VIS spectroscope can measure opaque samples, such as used motor oil, or transparent substances, such as ethanol. In addition, some substances have strong absorption bands at certain wavelengths, while remaining almost transparent at other wavelengths. Instrument designers often add several programmable gains to the signal path to increase the dynamic range.

Read the whole story at http://www.sensorsmag.com/adi-white-paper-download
 

Suggested Articles

OmniVision's new OX01F10 SoC module provides automotive designers with a small form factor with low-light performance, ultra-low power and reduced cost.

Several industry leaders have formed a QSFP-DD800 Multi-Source Agreement (MSA) Group to expedite development of high-speed, double-density, quad small form…

NXP Semiconductors N.V. has announced its secure fine ranging chipset, SR100T, to achieve precise positioning performance for next-generation UWB-enabled…