1 / 12

ELE2

ELE2. ANALOGUE REVISION NOTES. Differential amplifier Large input resistance 10 9  Large open-loop voltage gain, A,  10 6 Low output resistance  100 Frequency compensated Gain-bandwidth product. OP-AMPs. Input resistance = R 1 Output inverted Virtual earth point

hector-garza
Download Presentation

ELE2

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ELE2 ANALOGUE REVISION NOTES

  2. Differential amplifier Large input resistance 109 Large open-loop voltage gain, A,  106 Low output resistance  100 Frequency compensated Gain-bandwidth product OP-AMPs

  3. Input resistance = R1 Output inverted Virtual earth point Saturation/clipping Bandwidth/voltage gain Minimum resistance 1k Inverting Amplifier

  4. Recognise by multiple inputs Input resistance of each input = R Behaves the same as the inverting amplifier Used in DAC & Mixer Summing Amplifier

  5. Very large input resistance  109 Beware input resistor to 0V Output in phase with input Voltage gain/bandwidth Minimum voltage gain = 1 Voltage follower when Rf = 0 or R1= Non-inverting amplifier

  6. Voltage gain  0.7 – 1 Current gain  109 Output voltage in phase with input Very large input resistance  109 Remember to subtract Vgs from Vin to obtain Vout N-channel and p-channel Source Follower

  7. Provides power gain Needs op-amp to provide voltage gain Cross-over distortion at low volume Bias MOSFETs into conduction Saturation/clipping at high volume Increase supply voltage or reduce input voltage Push-pull amplifier 1

  8. Negative feedback Heat sinks Metal conduction Black radiation Large surface area Convection Radiation Fan Convection Push-pull amplifier 2

  9. Capacitor reactance • Reactance – the opposition to the flow of alternating current. • Measured in ohms. • Capacitor reactance decreases with frequency.

  10. Allows low frequency signals to pass, attenuates high frequency signals Break point Xc = R Low pass filter

  11. High pass filter • Allows high frequency signals to pass, attenuates low frequency signals • Break point Xc = R

  12. ELE2 Questions • Set in context – read the context – underline relevant details. • Look carefully at circuit diagrams – circle and name sub-systems. • Focus on relevant bookwork descriptions and calculations – answer these. • Attempt all sections – no credit can be given if there is no attempt at an answer. • Estimate, Calculate – show your working. • State and explain – do both!

More Related