Amplifier

Question 1

Find the transfer band of amplifier

Answer 1

• create another column called dB
  = 20 log (Uout / Uin)
• make graph of frequency (x) and dB (y)
• make small table for another series
• y axis: biggest dB - 3
• x axis: choose smallest and biggest x

Find lower and bigger dB on graph
- double tap on x axis
- edit bounds: lower max to zoom in
- find range of where two series intersect
*answer in Hz

Question 2

Can it be used for ECG

Answer 2

No because the transfer band of the ECG is from 0.1 to 100 Hz and the amplifier only covers from x Hz so it cannot be used

Question 3

How does the transfer characteristic change if we use negative feedback

Answer 3

• wider transfer band (Frequency)
• lower decibel (gain)