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Group noise contributors
Hi guys,When you do print->noise summary after a noise sim or pnoise sim, is there a way to group noise sources together; either by block or device?In the case of an extracted list, if you have a...
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Working around lack of sweeps in MC runs
Hi all,I need to run some MonteCarlo experiments on a circuit, while sweeping some of its parameters.However, this is not possible within the current ADEXL (BTW, why?)I am not very SKILLed...so here's...
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complex ac-analysis
Is it possible to perform a complex ac-analysis in cadence? In other words sweeping w in s=(jw+sigma), for a given sigma, rather than just s=jw?Cheers,Seb
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Strange simulation results about transient jitters of inverter's input and...
Hi all,I designed a cross-coupled LC oscillator with a few stages of inverters following its output. From PSS+Pnoise simulations I notice that the plotted jitter at the inverter output is smaller than...
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[Help] How to set up digital sources in Cadence?
Hi,Signal sources include some periodical digital signals, like "10111100110101100000,10111100110101100000,10111100110101100000,......". Is there any way to set up a signal souce conviniently?I tried...
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Error of vsource type=bit. "Waveform type must be specified ..."
Hi Mr. Beckett,Following your advice, I tried the bit vsource to generate a bit flow. However, an error came up.Here is my simulation circuit.
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Centering a PAC around a PSS oscillator outcome
Hi All,I would like to run a Periodic AC analysis (PAC) at frequencies around a carrier not known a priori.That is, I have an oscillator whose frequency - of course - is to be determined by simulation....
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Transient Output Log
Hello all, I am a newbie to cadence and want to understand output log of cadence well. I attached an image of output log as it appears during transient analysis. Is it normal to get such a...
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RF power output stage cross-conduction with complimentary pairs
Hello all, I am posting my first question here trying to appeal to RF experts. I have designed a power amp to deliver around 20W into a 1 Ohm load at 200KHz sine. The amplitude is more or less...
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Transient simulation - save state
Hi,I am a research scholar at IIT bombay, India. I have a long transient simulation running, which has frozen at 1.8us in a 10 us simulation. Is there any way to extract the state of the circuit and...
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[Help] Tech file from cadence.
I am trying to export cadence layout to GDSII files and then import it to HFSS. When I import the files to HFSS, I get a flat sheets. It seems that I have to generate (or export) some sort of Tech file...
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Monte Carlo Analysis of I/Q amplitude and phase mismatch
Hi all, I am designing a divider circuit for I/Q components. I want to find phase and amplitude mismatch between I and Q components using Cadence with "Monte Carlo Analysis". Please let me know how to...
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ADE- Difference between Node Set and Initial Condition
Hello,I have a very basic question: in ADE -> Simulation -> Convergence Aids, what is the difference between Node Set and Initial Condition? When should I use the formar and when the latter?In...
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[help] pll simulation in spectre
I am trying to run a PSS analysis of a closed-loop PLL in spectre, but encounter converge problems.Is it possible to run a PSS analysis of a closed-loop PLL?thanks!
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spectre 32 bit or 64 bit?
Hi,Ok, I am just an administrator. One of my users is adking me, why spectre gets invoked from 32bit directory instead of 64bit. Here is the log snippet, Memory available: 187.1503 MB physical:...
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Increase the number of points in a pss
Hello,I did a pss analysis, with shooting engine and I saw the resulting node-voltage over time. I switched the symbols on and I noticed they are too a few; I would like to increase the numer of points...
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One testbench for PSS and Transient Simulation with different stimuli.
Hi, I am trying to setup an all-purpose testbench for some amplifier circuits I need on a regular basis that can be used for all the simulations I normaly use: DC, AC, TRAN and PSS. The problem I have...
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Plotting the Phase Noise: *Error* quotient: can't handle (nil / 1.414214)
Hello friends I have simulated a VCO and I would like to plot phase noise after pss+pnoise simulation. But I face to this error: *Error* quotient: can't handle (nil / 1.414214)Could somebody help...
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For LNA design, how to get the transistor size (BJT) for the Ropt?
I have started using SpetreRF recently and would like to know how to determine the length of the emitter of a BJT in order to have an optimum noise resistance Ropt equal to the resistance of the...
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source contribution to PM noise
I am simulating phase noise with a spectre modulated pnoise analysis. I can plot total PM noise at the output using Direct Plot, but I would like to know what noise sources are dominating. Is there a...
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