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S11 for bandpass filter
I am designing a bandpass filter using active inductor as shown in attached schematic and had a query in this regard. Since this is a BPF I am interested in seeing its S21 response. But for that ckt...
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RF front-end simulation
Dear collegues,I am trying to simulate an RF front-end (LNA+VCO+MIXER) in order to get performances such as conversion gain, noise figure, etc.If I simulate only the LNA+MIXER and use a Vsin to emulate...
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Guarantee LC Oscillator Start Up over PVTs
Hi all and Andrew,I have a question which I think it has been examined thoroughly but I would like to clarify to myself something which is not very clear to me.The question is:Which testbench-analysis...
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Error in Evaluating IIP2 with Monte Carlo
Hello All,I would like to know why Monte carlo iteration is being terminated prematurely while computing IIP2 due to the following error:ERROR (SPECTRE-8003): mc1_subckts: Error evaluating ocean...
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The issues with Ports!!!
As i carrying out simulations using the port instance in analogLib, I noticed that when i define a pulse and dc port, i have this offset of 310.mV on the output of the both the pulse and dc. Please...
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S-parameter basic in Spectre RF
Hi I want to understand how basically spectre calculates s-parameters in 50-Ohm setup. Say I use port 1 and port 2 both 50 Ohms at input and output.So for s11 measurement there should be no reflections...
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Phase Noise Setup doesn't work in port/vsource
I'm simply simulating pss and pnoise for a port/vsource, with added phase noise "freq, noise(dBc)" pairs.In my testbench, there's only the vsource and it's labelled output, and gnd. In ade, I setup pss...
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Clock duty cycle variation with Pnoise?
Hi,From measurements we got a hint that the duty cycles of two clock signals change independently over time. We assume that this is a 1/f-noise effect and thus, I'm looking for a possibility to...
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Multi-sinusoid in spectre port component
Hi Andrew, In "Lib:analoLib/cell: port" cdf parameters with "Display Multi sinusoid" option limited the number of frequencies as "1", if use more than 1 the "pss" analysis not recognizing rest of...
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Problem when using RFDE momentum blocks in Cadence (Drop across Resistance...
Hi,I have a problem with the use of RFDE mom symbol view in Cadence schematic. The image is attached below for reference. The momentum block is basically a MOM capacitor for coupling ac input . In...
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RF circuit trasfer ADS to Cadence
Hi all,I am a newbie in using Cadence, but mostly using ADS. Now, I want to transfer my design from ADS to Cadence to modified and then import it back to ADS to simulate.I have followed the guidance in...
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Model RF behavioral blocks
Hi, I am using spectre simulator and I want to model RF blocks. I am interested to model noise figure and 3rd, 5th, 7th order nonlinearity of a block. What is the recommended way to do this? Is...
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Sweep in ADE XL ("sub-version IC6.1.7-64b.500.4 ")
Hi,I am trying to sweep a variable(Amplitude Code Word) and depending on its value I want to change the no of multipliers of the devices in my switch bank dynamically. So I have variables called...
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hbnoise: difference between sweep-type relative harmonic=0 and absolute
Hi,I am simulating a direct conversion receiver and I am interested in simulating the noise at baseband. The problem is that I get different results when using hbnoise with sweep-type relative...
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Verilog-A: Lookup tables for AC analysis
Hello everyone, I have a problem performing AC analysis on lookup tables based components.Basically, on the basis of Pown M. question, I wanted to extend the validity of that code to AC analysis as...
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Calculate input impedance for matching with spectreRF
HiI am designing an LNA and want to match its input impedance to 50Ohms port impedance. During 'sp' analysis in spectreRF , which function will give me idea about this impedance matching.Gp,Ga , Gmax...
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Query on Harmonic Port element in analogLib
Hi In what applications is harmonic port required. In user guide it mentions that this element is required when different impedance need to be set for different harmonics.Can somebody tell application...
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Quantus QRC for RF design parasitic extraction
HiI want to use QUANTUS QRC for extraction of my RFCMOS circuit layout. Can anybody tell what all options or properties need to be set in ICT file in order to generate qrcTechFile to be used for...
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FATAL (CMI-2010) in transient simulation
My spectre version is: Version 15.1.0.644.isr13 64bit -- 22 Oct 2016Error information as following:Internal error found in spectre at time = 35.7142 ps during transient analysis `tran'. Encountered a...
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