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198 Threads found on Spectre Noise
I've designed a PAM4-Transmitter with a Nyquist-frequency of 10GHz.Its test result came out far from expected.Apart from the IC itself,I use S-parameters module to act as a low-pass filter to get a general influence of PCB traces&Cables&Connectors in the design process. Even so,the outcome is much worse than what I got in spectre.
Yes, you can do this, it needs you to derive / extract the LRCM mesh accurately and impose likely aggressors and so on. I've been able to make DJ appear in spectre analog_extracted based simulations, C-only, from long lines routed in proximity. I have no idea whether your tools and PDK support inductance (let alone mutual). But the 'scope looks ve
I can get the noise density from spectre noise simulation as shown in the top figure, but can I get the integrated noise as shown in the bottom figure, thanks. 136131
I don't know what simulator you use in Cadence Virtuoso. We can use various simulators from Cadence Virtuoso. Invoke "Dynamic Parameter Ability" for Transient Analysis, if you use Cadence spectre. param=isnoisy param_vec=
See You can see a defintion of NF(k) in Keysight ADSsim and GoldenGate. If you use more than three ports, e.g, port1=RF, port2=IF, port3=LO, NF(2) is different from NF of Cadence spectre. Here you have to use resistor + vsin instead of port3=LO.
Hi everyone, I have two oscillators running at a nominal frequency of 10 GHz and 5 GHz respectively. The 10 GHz oscillator has a lower phase noise compared to the 5 GHz oscillator. I am trying to run the simulation where 10 GHz oscillator is acting as an injection oscillator to 5 GHz oscillator. I have set the Beat frequency as 5 GHz (since the
As the figure shows, do the noise simulation, but the output and negative input node of the amplifier is not "directly" biased, how to get the input referred noise data from simulation? Thanks 129361
Is "noise summary" tool reliable?It is reliable in most cases. Show me analysis statement. I don't know what simulator you use. However I recommend you to set "augmented=off", if you use Autonomous-Shooting-PSS/Pnoise in Cadence spectre. Try the followings, if you use Cadence spectre. (1) Autonomous-HB-PSS/P
There is no tool whose name is cadence. Even if you use Cadence ADE, we can use various vendor's simulators such as Synopsys HSPICE, Mentor Eldo, Keysight ADS, Keysight GoldenGate, Cadence spectre, etc. Always describe correct tool's name and vendor's name which you use as tool or simulator.
noise calculation format using cadence ads spectreWhat do you mean ? Use correct terminology. I have a circuit (buffer) to drive interconnect, i calculate the noise of it but the form of the noise in (V^2/H), whats this unit meaningnoise Voltage Density,
I've been simulating a mixer+LNA using Pnoise in spectre, and I can't make sense of how F and NF are being calculated from the simulated input referred noise. Below is an example result, input noise and NF are at the
Hi Dario I am not sure that Cadence/spectre can do the linear interpolation. What you should do is a interpolation of your points in matlab, and then feed this to Vdc in cadence. hope it helps
I am trying to generate a clock signal with random noise, but not using complicated VCO models in Cadence spectre. One possible way I think is to use the vsource in analogLib with "prbs" type, and specify the bit file with "...0101..." pattern. So that, I can put the noise for the pattern as provided by the vsource model. But I don't (...)
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 (...)
Hi, I tried to build a verilogA VCO phase-domain model by referring to Ken Kunder's paper. Then I have no idea how to start with, thus I set up a simple testbench as below image shown. I chose "noise" analysis and run. spectre then showed error indicating "Matrix is singular (detected at 'I0:idt0'). When I tried to remove below codes and re-
Hello, I have tried to perform a transient noise analysis, but I received this error: ERROR (spectre-16192): No convergence achieved with the minimum time step specified. I have read the possible solutions, but I don't know how to change "cmin". Do you have any suggestion? Are there other things I can do?
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 function. The (...)
Hi, Im working with Virtuoso/spectre in the design of a low noise amplifier. The very first thing to choose is a proper transistor operating point which provides a good compromise between noise figure (low current) and high gain (high current). Ive been told that the first thing is to define the appropriate current density (J_c) for the (...)
Hi, We generally simulate PLL system behavior and calculate loop parameters first by using tools like MATLAB or others, then start to realize the circuits. After that, we check the step response or phase noise on transistor level of the PLL with tools like HSpice or spectre. Here are my questions: 1. MATLAB simulation is based on l
I'm trying to simulate the noise psd of nmos. but when i performed the noise analysis and plotted the resulting output noise, it is zero over all the frequency range? could someone help me? thanks. 100961100962100963