Title :
A.C.-coupled probe technique for very-low-frequency operation
Author :
Barker, R.W.J. ; Hart, B.L.
Author_Institution :
University of Sheffield, Department of Electronic & Electrical Engineering, Sheffield, UK
Abstract :
The use of a junction-f.e.t. matched pair, functioning as a self-biased source follower, bootstrapped by the operational amplifier voltage follower it drives, facilitates the design of an a.c.-coupled oscilloscope probe with maximised input impedance. Consequently, a lower-cutoff frequency of less than 3 Hz is feasible with input coupling components that are not incompatible with current i.c. design practice.
Keywords :
cathode-ray oscilloscopes; circuits; field effect transistors; operational amplifiers; probes; IC; VLF operation; bootstrapping; cathode ray oscilloscopes; circuits; design; field effect transistors; operational amplifier; probes; self biased source follower;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19740266
