US Patent 10139285 Fully-differential amplification for pyrometry

This disclosure describes systems, methods, and apparatus for improving the signal-to-noise ratio, increasing sampling speed, and increasing the dynamic range of a pyrometer via improvements to the amplification section. In particular, single-stage non-differentiated amplifiers can be replaced with a differential amplifier circuit that increases gain without a proportional increase in noise. The differential amplifier circuit can comprise a pair of transimpedance amplifier circuits arranged in parallel that receive a differential current from a photo detector and generate a differential voltage output in response having a transconductance gain.