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Hello, guys,
When you run transient analysis in spectre, you can enable 'transient noise'. When 'transient noise' is enabled, no noise power energy data is displayed and able to set, and you can only set noise scale.
My question is: By enabling 'transient noise', what kinds of noises are...
To clarify about the plot result from method 1. The plot attached as figure 1 is wrong. It is for bandwidth from 1Hz to 100MHz. I ran the same simulation from 1Hz to 100kHz when I did the calculation with RMS function of calculator, .
Both of the input referred noises by method 1 and method 2...
gangs,
I am running .noise analysis in cadence's spectre. Two methods display the simulation results: method 1. plot equivalent input noise. This can be done by: locate spectre simulator menu-->results-->direct plot-->equivalent input noise. A figure will pop out. Then go to calculator's RMS...
I still do not quite understand this point. Can you give an example? Thanks.
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Thanks for the information. I want to measure a 10us pulse width current. Forgot to mention in the original post: the pulse width is ~pA. The time between two pulses is unknown.
Please refer to...
I want to figure out why this is true. The noise includes thermal noise and 1/f noise.
The thermal noise is: In^2=4kTγ*gm, where gm=2*Id/(Vgs-Vth).
For these two process technologies, if Id and (Vgs-Vth) are equal, the thermal noise is equal. Am I right?
The 1/f noise is: Vn^2=K/(CoxWLf)...
Thanks for your reply.
I don't quite understand your saying: a 1 MHz bandwidth in 0.5µm process, certainly needs a larger operation current for that than a same-bandwidth amp in 0.18µm.
We know that about GBW (Gain–bandwidth product): GBW=gm/CL and...
The cost is not an issue to me. The voltage supply is not a problem.
I was concerned about speed. You said that 1MHz bandwidth is applicable with 0.5um process. I guess you meant 1MHz bandwidth is achievable by a single stage OTA.
Noise maybe a issue. I need to measure a pA level current...
Hi, guys,
I need to measure a 1us~10us current pulse. The design goal of the bandwidth is 1MHz. I have two options about process technology: ON semiconductor C5 CMOS 0.5um and IBM 7RF CMOS 0.18um. Anyone has any experience about that? Or, can anyone give suggestion about how to choose the...
Hello,
Any one know about power consumption differences between simulation and measurement about analog/digital/mixed-signal integrated circuits?
Using cadence spectre, I believe that simulation result is the most close to measurement result for low frequency analog circuit, compared to...
Hi, folks,
I am writing an academic paper about micro-watt 1st order sigma-delta ADC. The schematic is attached here. I need to know what is the ratio between analog components and digital components. I think that that in a mixed-signal circuit, compared to that of analog components, the...
What do you mean by "input dependence"? I know The second circuit input node voltage swings, which the first circuit input node voltage fixes at "virtual ground" of OTA.
The first circuit is more popular that the second one. WHY?
HI , Guys,
I have a question regarding current mode SigmaDelta circuits. Two circuit structure are attached. Compared to "Circuit1", OTA is removed in "Circuit2". What is advantages and disadvantages of these two designs, respectively? To my knowledge, the first circuit is more popular that the...
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