An instrumentation amplifier for use in medical, biological and electrophysiological measurements is described. It is a very low cost, high performance, FET input amplifier, its outstanding characteristic being a very low noise level, of the order of one tenth of that of most amplifiers of the same type available today. Typical r.m.s. noise between .025 and 250 Hz is below 50 nV. To achieve this result very low noise but cheap discrete active components had to be used together with integrated ones. A built—in offset recovering network prevents d.c. differential bias at the input as well as the intrinsic offset of the input stage itself from being amplified and appearing at the output. With a gain of 50 an offset up to ± 200 nV can be recovered, both the output dynamic range and the common mode input range being ± 5 V. Overload recovery is exceptionally good.
A very low noise instrumentation amplifier for biomedical applications
PADOVINI, GIORGIO MICHELE
1986-01-01
Abstract
An instrumentation amplifier for use in medical, biological and electrophysiological measurements is described. It is a very low cost, high performance, FET input amplifier, its outstanding characteristic being a very low noise level, of the order of one tenth of that of most amplifiers of the same type available today. Typical r.m.s. noise between .025 and 250 Hz is below 50 nV. To achieve this result very low noise but cheap discrete active components had to be used together with integrated ones. A built—in offset recovering network prevents d.c. differential bias at the input as well as the intrinsic offset of the input stage itself from being amplified and appearing at the output. With a gain of 50 an offset up to ± 200 nV can be recovered, both the output dynamic range and the common mode input range being ± 5 V. Overload recovery is exceptionally good.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
