Single-stage and multi-stage amplification of operational amplifiers

QWE4562009

Single-stage and multi-stage amplification of operational amplifiers [Copy link]

Single-stage and multi-stage amplification of operational amplifiers

For example, if you want to zoom in 20 times, if it is a one-stage zoom, just select the scale factor of 20. But some people use a two-stage zoom, which is to zoom in 2 times first, and then 10 times! What is the difference between a one-stage zoom and a multi-stage zoom when the final magnification is the same?

jimtien

Possible reasons 1. Signal polarity requirements, two-stage reverse amplifier, and finally positive output 2. Input and output requirements (impedance/drive capability/bandwidth, etc.), requiring a specific op amp combination

QWE4562009

jimtien posted on 2022-6-3 12:07 Possible reasons 1. Signal polarity requirements, two-stage reverse amplifier, and finally output positive polarity 2. Input and output requirements (impedance/drive...

1. If the op amp is powered by a single power supply, doesn’t the polarity only have to be +?

2. What are the differences between impedance and driving capability for single-stage op amps and multi-stage op amps?

jimtien

QWE4562009 posted on 2022-6-6 14:08 1. If the op amp is powered by a single power supply, isn’t the polarity only +? 2. Impedance and drive capability for single-stage op amps and multi-stage op amps...

1. Refers to the phase relationship between the input and output signals of an inverting/non-inverting amplifier

2. Some requirements cannot be achieved by single-stage op amps

QWE4562009

jimtien posted on 2022-6-7 11:07 1. Refers to the phase relationship between the input and output signals of the inverting/non-inverting amplifier 2. Some requirements cannot be achieved by a single-stage op amp...

Do the input and output need to be in opposite phase or in the same phase?

jimtien

Of course it depends on the design requirements... The fact that you ask this question shows that you have no idea about op amp circuits and you need to find a book to brush up on it.