Title :
Buffer Amplifier with Femtofarad Input Capacity Using Operational Amplifiers
Author :
Kootsey, J.Mailen ; Johnson, Edward A.
Author_Institution :
Department of Physiology and Pharmacology, Duke University Medical Center, Durham, N. C. 27710.
Abstract :
A unity-gain buffer amplifier with an input capacity below 0.01 pF and an input resistance above 1012 ¿ is described. Low input capacity is achieved without the necessity of feedback adjustments by bootstrapping the entire input stage, including power sources and shielding. The amplifier is of simple design and is based around commercially available operational amplifiers.
Keywords :
Blood; Diodes; Foot; Lamps; Low pass filters; Operational amplifiers; Optical amplifiers; Optical filters; Pediatrics; Transducers; Amplifiers; Electricity; Feedback; Membrane Potentials; Microelectrodes;
Journal_Title :
Biomedical Engineering, IEEE Transactions on
DOI :
10.1109/TBME.1973.324240
