M mic5 Member Jan 3, 2011 #1 I have read an article in which, two stage RF amplifier is used which have gain of 11dB and 31dB respectively. My question is why these two stage of amplifiers needed? Why can't we use 42dB amplifier? What are the benefits in terms of cascaded amplifiers here?
I have read an article in which, two stage RF amplifier is used which have gain of 11dB and 31dB respectively. My question is why these two stage of amplifiers needed? Why can't we use 42dB amplifier? What are the benefits in terms of cascaded amplifiers here?
ericgibbs Well-Known Member Most Helpful Member Jan 4, 2011 #2 mic5 said: I have read an article in which, two stage RF amplifier is used which have gain of 11dB and 31dB respectively. My question is why these two stage of amplifiers needed? Why can't we use 42dB amplifier? What are the benefits in terms of cascaded amplifiers here? Click to expand... Consider bandwidth, what is the bandwidth of the RF amplifier you quote.???
mic5 said: I have read an article in which, two stage RF amplifier is used which have gain of 11dB and 31dB respectively. My question is why these two stage of amplifiers needed? Why can't we use 42dB amplifier? What are the benefits in terms of cascaded amplifiers here? Click to expand... Consider bandwidth, what is the bandwidth of the RF amplifier you quote.???
4pyros Well-Known Member Most Helpful Member Jan 4, 2011 #3 One may be a voltage amp and the other a currant amp.
crutschow Well-Known Member Most Helpful Member Jan 4, 2011 #4 You may not be able to build one stage with both the desired gain and bandwidth.
K KeepItSimpleStupid Well-Known Member Most Helpful Member Jan 4, 2011 #5 Remember too, that multiple stages multiply the gains and not add.
crutschow Well-Known Member Most Helpful Member Jan 4, 2011 #6 KeepItSimpleStupid said: Remember too, that multiple stages multiply the gains and not add. Click to expand... But if the gains are expressed in dB they add. That's one advantage of expressing gain in decibels.
KeepItSimpleStupid said: Remember too, that multiple stages multiply the gains and not add. Click to expand... But if the gains are expressed in dB they add. That's one advantage of expressing gain in decibels.