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Hi,
I am currently trying to characterize the NMOS and PMOS using Synopsys tools, first graph need to be plotted is Id versus Vgs of which Ive gotten it and successfully plotted.
Now Im trying to plot gm/ID versus Vgs using same Synopsys tools, which Ive tried to google and search similar...
Hi andre_teprom, thanks for the explanation, Im aware about testbench not being same as human actual body. This is just a small simulation to validate the OTA circuit.
You said that input amplification stage should be done with Opamp, but most of papers doing OTA as their amplifier circuit? Im...
Hello, Im simulating symmetrical OTA/ 3 current mirror OTA as shown in figure below.
The testbench as shown in figure below.
The circuit powered up by +/- 0.9V voltage source and the current source is 2uA. For the input, I use vpwlf which I can put ECG waveform input from MIT database.
But...
Hello FvM, thank you. So , it means that if some amplifier in paper said that the voltage source used is 1.2V, they used +/0.6V right? not just one 1.2V Vsource right? I ve been meaning to ask this question because the amplifier schematic doesnt put VDD and VSS in the circuit which VDD connected...
Hello,
I want to ask about voltage source to power up two-stage amplifier. Currently im simulating the two stage amplifier using 90nm technology in Hspice and i found different gains produced by the same circuit if I change the number of voltage source from one into two, from single source 1.2V...
Hi KlausST,
Ive already do the simulation and I cant get the simulation results as before but nevermind.
I also have some questions regarding the values of TOX and VTHO where I am using BSIM4 level 54 model and it is stated that TOX is equal to 3.0e-9m and VTHO is equal to 0.7V, meanwhile...
Hello KlausST,
Im doing research regarding ECG signals where the signal of real ECG difficult to be simulated, so I subsituted it with 8mVp with 500Hz.
If I changed the type of 8mVpk to 8mV AC, then the gain signal will be clipped again or not?
Thank you.
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Hello KlausST...
Hello FvM, thank you for your answer.
I understand that power supply +/- 0.5Vpk will clip the output signals.
So, if i increase the power supply into 10Vpk, the output signal would not be clipped again right?
and in my case, I need to use the +/- 0.5V as Im looking to reduce the power...
Hi, thank you for the reply.
The Vdd and Vss is 0.5 V and -0.5V respectively. What you meant by non-feedbacked OPAMP? Is there any criteria for OPAMP to be stated as feedbacked OPAMP?
As for the gain, I have simulated the circuit and refer to the images attached, that is gain from the circuit.
Hello,
Im doing schematic and simulation of opamp circuit using Synopsys Hspice 90nm technology, . For input, Im using 8mV, 500Hz as V+ input (AC 1V and 0 deg phase) and -8mV, 500Hz as V- input (AC 1V and 180 deg phase). So after transient, DC and AC simulation, the gain obtained is correct...
Hello, thanks for your response. Alright, as you say gm is small signal parameter which is bias dependant, so can you help me on how to do the calculation of W/L ratio for differential amplifier? May I know what BSIM model book?
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