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18 Threads found on Cascade Amplifiers
I personally NEVER try to cascade more than around 30 dB gain without some sort of stage to stage shielding. Have had too many problems with self oscillation in the past.
Apart from the problem what's a suitable input source for AD8333, the shown amplifier topology looks erroneous in any case. The feedback loop through cascaded amplifiers must be considered unstable. "Fully differential" is usually designating differential in/out amplifiers, alternatively a transformer could be used.
Hi, I've just read in a book that a cascaded circuit has a high input and output resistance. About this I have a two questions: 1) which advantages has a circuit with high input and output resistance? 2) why is a cascaded circuit useful for a circuits? For every answer I will be thankful. :smile: Sarah
Hi, I am constructing an RF Chain. I have put 4 amplifiers in cascade. I have added a tone source. The P1dB and IP3 are fixed. So, I can vary only the gain(transducer gain). The cascaded gain, I am getting 50dB but noise figure is showing 166dB. Certain times, i also get the message, no noise power is available at input. Should I add (...)
After added feedback oscillator it started to oscillate. I don't want it. First comment, you don't necessarily need to cascade amplifiers, because the shunt has the same ground reference as the input signal. But with sufficient fast OPs, you possibly get stability problems due to the MOSFET input capacitance even with a single OP.
This is not a power amplifier. There are two low signal amplifiers placed in cascade. The low pass filter at the output has a cut-off at 75 MHz, and need to be re-designed to allow passing 95 MHz signal. (see the attached
When i verify the cascaded amplifiers with ADS S-parameter simulation, i get a nice curve showing that i obtain 60 dB gain at the IF frequency, which is what i want. However, for real implementations 60 dB of gain can become a problem if the amplifier is not band-limited, i.e. by having filters in between cascaded stages. I dont undertand (...)
A “cascode” amplifier uses a transconductance amplifier followed by a current buffer, when a “cascade” amplifier are two (or more) transconductance amplifiers following one to each other. I found there are a lot of papers and books which are confusing these two terminologies.
Hi; I need to cascade amplifiers to achieve higher gain. But my signal output from first stage includes a DC offset. How can i remove the offset without using a coupling capacitor between the two amplifiers. Please also let me know of any notes/tips on cascading amplifiers. Thanks in advance
Liang,J.Y.,and C.S.Aitchison,"Gain Performance of cascade of Single Stage Distributed amplifiers," Electronics LEtters,Vol.31,NO.15,JUly 1995,pp1260-1261 Banyamin,B.,and M.Berwick,"The Gain Advantages of Four cascaded Single Stage Distributed Amplifier Configurations," Digest of the iee
if there are n stages of amplification each with bandwidth = b what is the effective b.w of all n amplifiers in cascade?........ i found it as b.(2^1/n -1 )^
Cascode = a single amplifier (which might have many number of transistors for gain boosting purpose) cascade = you add up a few stage of single amplifier (like adding block in series)
Hi Everyone, I need help concerning CATV specifications. I crossed upon the C/N ratio and it's use in CATV system design. C/N of and amplifier means the ratio of Carrier to the output noise of it. For one unit this definition is fine, but what about a cascade of amplifiers ? In ordinary RF cascade design, one wants to calculate the (...)
Hi, I want to design a power detector which can monitor the received signal power. I know one implementation is to use piece-wise linear proximation of the logarithm function by using a cascade of limiting amplifiers, which can be implemented with CMOS process. If I don't want to use cascade of limiting amplifiers(which (...)
What everyone described is a cascode circuit. cascade connection is a similar circuit but with a signal decoupling at the connection of the two stages, so that it is connected as in cascode for the DC current only (to get higher efficiency by using the same DC current for both stages), but still get two independent stages for the AC signal.
You can connect two MiniCircuit amplifiers in cascade. S12 vill be the sum of them both. Use PI-type attenuators at input, between amp's and at output to achieve correct overall gain AND to serve for low input/output VSWR. Careful PCB layout is important to maintain S12 isolation.
Hi everyone. Need some advice from you all. Basically when we cascade amplifiers we faced the problem of bandwidth shrinkage. Is there any way where i can resolve or at least reduce the bandwidth shrinkage. From the text books for example Franco and such we can find numerous formulas to have the widest bandwidth however this is not a transistor
This is quite wideband and cascade connections may not give this bandwidth and power level. Instead of that, "distributed amplifier configuration" should be used. For this kind of amplifiers, there are lots of document and paper. But it's quite difficult to implement.