Need help with feedback understanding

[hayowazzup]

Hi all,

does anyone know how to tell whether a transistor/opamp circuit has a series/shunt input/output?
and what do mixing and sampling mean?

is there a feedback in this circuit? i can't see there's any feedback network
Common Collector Amplifier

 

[FvM]

A brief tabular overview of feedback topolgies is given here Negative feedback amplifier - Wikipedia, the free encyclopedia

A detailed explanation with caculation of respective gains can be found in Razavi, Design of Analog CMOS Integrated Circuits, Chapter 8.2 Feddback Topologies

Sampling is a basic topic in Signal Processing Sampling (signal processing) - Wikipedia, the free encyclopedia

 

[LvW]

...is there a feedback in this circuit? i can't see there's any feedback network

I will show you the feedback path.
In many cases it is possible by visual inspection to identify the feedback loop - but not always.
A common collector stage is such a case - and you need the desriptive formulas to see the feedback effect.
When these formulas are transferred to a block diagram you see the feedback loop (see pdf attachement)