Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
Hi All,
i tried to design a diff amp using ngspice however im not able to get the simulation. I want to find the gain freq plot. can you please tell what's wrong with my method?
or if you any design of which you can give me specification of parameters id mentioned.i can try that as well . so if that doesn't match with your results you can get better understanding of my mistakes
hi i tried as you explained.
gm = 314us, now assumed overdrive of 0.2v and id/2 was 31.4uA.
but from slew rate id needed 25uA. so adjusted overdrive to 0.16v.
used icmr- to get the vds sat for tail and then calculated the w/l.
input nmos w/l got from gm and id/2.
icmr+ got w/l of load...
ok. so you are saying that instead of fixing the tail current using GBW data, use that to get the gm value for the input nmos. but then i will have 2 unknowns iD and (W/L). do you have any docs or reference regarding one design.
Hi All,
Can anyone share any document for designing the active load diff amp. I tried designing one with the following specs
VDD = 1.8v, GainBW = 5MHz, Cload = 10pf, ICMR+ = 1.6v, ICMR- = 0.8V, SLEW RATE = 5V/usec, Pdiss <0.3mw.
i started with getting the required tail current source. using...
for small signal model
i just want to find the differential gain of this circuit, so either i can use the conventional superposition theorem and then get the differential and common mode gain, or draw the respective differential ad common mode half circuits and solve those.
Now i know while...
Hi All,
I wanted to know that is it possible to have a better radiation performance by using an antenna which is coupled to the original source antenna. consider it like this.
practical scenario: suppose i have one antenna which is having an omnidirectional radiation pattern, now i am using...
Re: finding rc constant of an complex rc circuit
okay.
so among the two poles whichever is smaller that will dominate and will define the overall time constant.
but just for curiosity can you please tell why the above method is wrong. because suppose if it is possible to convert the parallel...
finding rc constant of an complex rc circuit
how to find the time constant of a complex circuit, which has many series and parallel components.please see the example circuit below.
can i convert the parallel components to series one using the q value transformation. and now since all are in...
Hi All,
I wanted to know how to calculate the overall evm performance. Suppose there are two systems with evm A and B. if both are connected in cascaded mode what will be the overall evm.
thanks for the reply, one reason is to tell the amplifier class as well. https://k9la.us/Characterizing_an_RF_Power_Amplifier_with_Pin_and_Pout_Data.pdf
However what i am struggling is to understand is the behaviour for a particular power level.
suppose i am giving pin = -8dbm, now how to tell...
Hi All,
I was reading a datasheet and came across to see a plot about Gain vs Pout.Normally we see plot gain vs frequency and pot vs pin to see the behaviour, so why do we need gain vs pout plot and what to understand from it since it is not telling about input power...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
