title: Note: A high dynamic range, linear response transimpedance amplifier.
abstract: We have built a high dynamic range (nine decade) transimpedance amplifier with a linear response. The amplifier uses junction-gate field effect transistors (JFETs) to switch between three different resistors in the feedback of a low input bias current operational amplifier. This allows for the creation of multiple outputs, each with a linear response and a different transimpedance gain. The overall bandwidth of the transimpedance amplifier is set by the bandwidth of the most sensitive range. For our application, we demonstrate a three-stage amplifier with transimpedance gains of approximately 10(9)Ω, 3 × 10(7)Ω, and 10(4)Ω with a bandwidth of 100 Hz.
authors.affiliation: Yale University, Department of Physics, P.O. Box 208120, New Haven, Connecticut 06520-8120, USA. stephen.eckel@yale.edu
authors.forename: S
authors.initials: S
authors.lastname: Eckel
authors.forename: A O
authors.initials: AO
authors.lastname: Sushkov
authors.forename: S K
authors.initials: SK
authors.lastname: Lamoreaux