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Hello, I am running cadence virtuoso 6.1.5 and trying to sort out the monte carlo analysis for process variation and mismatch. I want to plot the gain vs frequency plot of a single-ended amplifier for 10 runs i.e. I want to see the 10 gain-curves in a graph window. The only option in EVAL TYPE in output (...)
1) select a device according to operating frequency, gain, supply voltage, power and etc. 2) plot DC characteristics and determine DC operating by using Prms = Vds x Ids. Prms is RF output power. 3) do impedance matching for the PA using commercially available matching tools (e.g ADS and etc). make sure the matching network within the Qmax (...)
when i entered AC 2 or AC 3 the shown gain and ugb is doubled and tripled , how ? You are confusing output voltage with gain. gain is Vout/Vin, so if Vin is unequal 1V, you need to calculate a ratio.
the phase magnitude plot doesn't seem to indicate a stability problem (see attached images). To say so with some reason, you would have performed the AC analysis with a parametric sweep of output current set point. Did you? The problem is that transistor gm varies with drain current, loop gain does respectively. In addition, larg
I kinda find it hard to design an EMI filter for my microinverter (output is 60Hz at 360Vac). I already have the values for my inductor but then I cant find the correct values of capacitor. I used the 1/2pi(LC)^1/2 formula but then there are surges at different frequencies, the highest gain in my bode plot is around 50db which I believe is (...)
I have a beamformed output, say y = weights * signal, where the signal is gaussian,i.e signal = randn( 1 , 1e5 ). Now I want to visualise the output in angular domain, i.e I want to plot the gain of the resulting signal y as a function of elevation angles. I am considering the mainlobe of 'signal' to be pointing in (...)
As my attached picture, if we have negative feedback system, we should make unity gain be within -180 phase not to oscillate our system, considering the number of pole in amp. And I think, upper unity gain frequency, my Aol(in the picture) already has -180 phase because amp has negative gain. so without considering the number of pole (...)
The problem with the design is the inductors cancel and you only have a 1st order RC rolloff with poor Q. A proper filter design requires specs for pass band gain, band stop attenuation as well as source and output impedance with load.
You didn't reveal which analysis tool you're using. If it is Cādence SPECTRE, insert an iprobe instance in series with Cf, run an STB analysis and plot gain & phase.
Hello frnds, I am involve in design of current mode analog circuit and working on TSMC0.18um process (cadence). Pls tell me how to find ac current gain, if output current depends upon two or three input signals.
Without any further information I only can say: Perform an ac analysis and plot the gain as a function of frequency.
Along with your frequency plots of the individual signals, add a plot of (inp-inn)/(outp-outn). Your simulator should be able to plot this function. I would suggest tp plot the invers of the given expression, since the gain is defined as output/input.
1.) Input common mode range short v0 and vin+ pin, choose dc analysis and sweep vin- from 0 to vdd.. plot vin- and v0 2.) output resistance connect vdc from analoglib at v0 pin, choose dc analysis and sweep vdc form 0 to vdd, plot v0 and I(vo) from that calculate R 3.) Differential gain connect (...)
Hey, thank you two! I tried to do as you said (see screenshot) and I think that my gain can be set by Rfb/Rin now. However, my phase is... not what I expected and if I apply larger AC signals than 1mV at the input, my output common mode goes up. I made pictures and hope, you can tell me what I did wrong... ;__; Arie
Thank you. it very helpful for me. now i designing for wideband mixer. so normally for fixed band, if wanna plot graph for conversion gain versus RF frequency we just vary RF freq and fixed LO freq. For my case i wanna check the stability level of conversion gain along the wideband range. Its mean that i need to vary RF freq in between the (...)
I have designed a single-balanced passive mixer having an ideal current source as input.After the switches,as seen in Fig.1,there are LPF's with a cut-off frequency of 10 MHz.I get the expected output however I cannot understand why when I plot the input gain,its form is like the one shown in Fig.2 .Shouldnt it be the similar to the LPF?[/B
i/p o/p ? Its the IF in v. the RF out. LO is not wanted , but is required ! 1 dB compression occurs when the large signal gain is 1 dB lower then the low signal gain. It is traditionally plotted on log/log graph paper. If you plot the output power against the input power it will be (...)
Yes, I agree with erikl. For example, see also the last comment in the referenced Cadence link. More than that, the whole expression "current gain" is misleading. There is no input current that is amplified and then appears as an output current. The MOS input current is just a kind of capacitive leakage current and has no direct relationship wit
Hello guys. i am designing a OTA in weak inversion... and the voltage gain looks good but the gm behavior shows very low values at low frequencies it this normal? I calcuate that from the ratio of the output current over the voltage input. It this correct? 73483 its only for gathering the idea for weak inversion
Hi Rajeshree, setup up your testbench such that your OTA is in unity gain Feedback. Run a DC sweep and measure the output error current. you can connect your output to a current mirror source/sink (it depends on your transconductance design). Change in o/p current wrt change in i/p V is your Gm of the whole circuit..
LDO load current source or resistive :The reality is some where in between ,so i would test LDO with both resistive and current source ,ofcouse you get different AC gain from the fact that current source has high output impedance . make sure you plot Phase margin Vs load resistor
The DCM current mode flyback topology bode plot is very simple? ....for a flyback , the bode plot of the Modulator and Power stage, simply starts with a horizontal line at the DC gain level.....then goes DOWN AT -20dB/decade at the pole, which is 1/(2*pi*R*C) where R = load and C = output then goes horizontal (...)
i tried to plot TF curve for ADC and now trying to plot gain curve in db for the same in matlab. can someone gimme some idea how can achieve this. is there a functionality i can use regarding this? suppose my output vector is B and input vector is A now how can i plot the magnitude and phase (...)
If I understand right, the question refers to amplifier non-linearity. You can perform a parametric small signal analysis with superimposed DC voltage as parameter. You didn't exctcly specify gain in your question. If you refer to DC gain, you can also make a differential input DC sweep, calculate dVout/dVin and plot it over Vout.
Run a LF transient analysis in the mid of your (already known) ICMR, generating a suitable peak-to-peak output voltage (say 2/3 of your supply voltage, depending on your output stage). Then sweep this transient analysis far over the full (already known) ICMR plot the amp gain Al (open or closed loop - depends on your i
Dear all, I am using C@dence to simulate my upmixer circuit and want to get output noise value. I am using pss+pnoise to simulate it. In the "Direct plot Form", it could allow me to select "output Noise". However, I found the result is different using this equation " Ouput noise = -174dBm/Hz + gain + NF " The (...)
Hi all. can someone help me how to find gain of an differential amplifier in cadence.. i mean what are going to be my virtuso parameters.. and how to plot graph, and how to measure gain ?? thanks, sreel
There are some MatLab and MathCad routines that calculate the gain and Phase Response of the PLLs. You may use them to plot the response..output Spectrum can not be plotted but measured...
There isn't circles such Input Return Loss.. Instead, you should plot Available Power gain circles or Power gain circles for different input and output terminations. Or, you can simulate the circuit to find simultaneously match impedance values etc...
i think just do DC, and take the derivative of the output. BTW: why don't you measure the peak-to-peak swing instead of the gain? you can also plot the swing versus time.
I guess u can sweep Vod from a value to another one, than u can calculate the corresponding differential gain...
What about sweeping the gate bias and plot the drain output.. For best conversion gain an active mixer doesn’t need only proper bias, but also proper matching at RF and LO input and IF output.
Hi, I have met a problem during my project. I need to plot the vco gain but I don't have spectre analyzer. I 'm using hspice... Does anyone know how to plot the gain using hspice? I know you can use .measure to measure the frequency and plot against vctrl sweep. But how would you do the (...)
Hi, I'm trying to make calculation of natural resonance. the schematic with 3phase AC output transformer connect to Filter Capacitor and 3phase motor induction. this system exactly measure by resonance analyzer by bode plot with voltage gain versus frequency. :?:The problem is I can't get the hand calculation to compare the analyzer :cry:. (...)
Hi all, I think this is a basic one. I'm new to ADS. My circuit consists of a FET device+biasing network+matching network. I'm interested to see the power gain (and other S-parameters) for different values of one of the inductors of the network. The desire output would be a plot with several power gain traces for (...)
First of all you need decide if you want to use an active or a passive filter. Lets say you design the simpler of the two which is a passive filter. Now you must decide on the bandwidth of your PLL (which is the frequency on the bode plot where the loop gain of the PLL crosses 0db). The bandwidth must be less than 10% of your reference signal of 50
what software do you use for simulation, if you are using ADS, you can easily plot NF/freq, gain/freq, S paramter/freq in a plot.
Hi Hajer, Use the same setup as your analysis for the differential mode gain ... and just define your input noise source as the source which you have connected to your input devices. AC analysis gets executed first and then noise analysis. You can see the output noise and input referred noise from the direct plot utility in ADE ...
hi friends how to find the gain of phase detector....?? i can understand that it is output voltage divided by input phase..... my doubt is how to find it practically ( ie in hspice or cadence) thanks in advance
In general, you use a gain-phase analyzer. Insert a small resistor (22~100Ω) in series with the top resistor in the output divider. Using a transformer, inject the signal from the analyzer right across the small resistor. Adjust the level to get only about 50~100mVpp of signal in the DC output. Connect the test channel of the (...)
I have a picture of gain and Phase margin of my LDO, can you tell me about stable of my ldo? And i have a question: i need determine value of Rpar, i use Hspice to simulate. Please, help me.
I want to study the stability of my feedback transimpedance amplifier, therefore, I think I should take a look at its open-loop gain and phase response VS frequency, just Bode plot But I have not figured out how can I do this simulation in cadence. Basically, I know I should use AC analysis. I tried to use a
Hi, all I was wonderign how to plot the dc open loop gain versus output range by using Hspice. Please see the figure shown here or go to Thanks for your reply.
You need to plot both phase and gain for the amplifier. You will notice that both of them will stop being linearly dependent on the input at some point. (this does not happen simultaneously) Basically it tells you where the non linearity or the compression is beginning hope this helps
Low gain means that some of active components does not work in active region... If you are not sure which plot vds voltage of all transistors and see if Vds (Vsd for pmos) drops below Vdsat=200-300mV. I think that your mirror transistors are too small i.e Vgs is too high and that you have problem with left mos of differential pair. Try to increa
Who could help me with question 5 of the attached homework ? Which spice circuit to simulate ? How to arrange the voltage and source current to keep v*=2Id/gm constant while varying Vds ? Thanks. Question 5 : plot the output resistance ro and DC gain gmro versus VDS for an NFET and PFET. To maintain a DC gain of 80% (...)
how are you measuring gain in a switching circuit? An AC plot won't be correct with a switching CMFB since it calculates a DC bias point first. You would need to model your switched CMFB circuit as a linear block, then do the AC sweep. Otherwise, if you're running a transient sim you should be able to see pretty clearly if the output is (...)
Hi, I would like to make a plot to show the output range of an op amp. I want to plot the gain vs the output voltage. Can some one show me how to do this using hspice and awaves? Thanks.
Hi, I'm a beginner to Analog IC Design. And I got lost when I took some hand on calculations about the circuit. For example, to calculate a single CS stage with current source load. I know that the gain equals to -gm(ro1||ro2), and that gm equals to (k'(W/L)Id)? and ro equals to (1/λId). However, how can I decide the Id if I want to calcu
Did anyone know how to simulation switched capacitor filter by Hspice 2004.09 with frequence response?That is if I give AC signal then plot the output gain vs. the frequency.I know that The SpectreRF can do this with command PAC.The HspiceRF has command HBAC seems like the SpectreRF PAC command.