Question

Which of the following option is correct regarding the Buffer Amplifier?

(a) low impedance signals to high impedance signals

(b) high impedance signals to low impedance signals

(c) ac impedance signals to dc impedance signals

(d) dc impedance signals to ac impedance signals

I got this question during an internship interview.

Question is taken from Biotelemetry Application on Wimax Networks in chapter Biomedical Telemetry of Biomedical Instrumentation

Answer 1

Right answer is (b) high impedance signals to low impedance signals

The best I can explain: A buffer amplifies is essentially an impedance converter, that converts high impedance signals to low impedance signals. Noise is typically generated from motion artefacts and power line interference. A common solution used to suppress noise in dry electrode signals is a buffer amplifier.