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52 Threads found on edaboard.com: Gain Output Plot
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.
Hello frnds, I am designing a current conveyor circuit, pls tell me how to plot current gain versus frequency curve in Cadence.
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.
Hi, Below is the schematic with which I need help. 96190 I want to calculate the following parameters using Spectre but am not sure how to go about doing it- 1.) Input common mode range 2.) output resistance 3.) Differential gain 4.) Unity gain frequency 5.) Input referred thermal noise at 1 MHz Transistors
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..