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Noise And Spectre

130 Threads found on edaboard.com: Noise And Spectre

How to evaluate the on-chip IR drop&Ldi/dt's effect on noise?

What I see is, your clock*measurement rollup has about 20pS of jitter, and the 4-level data waveform is showing about 60pS. So you might say that there is 40pS of "contributed jitter". With prime (incoming) jitter 1/3 of the total, there has to be some questions about test hardware setup. Me last time at that rodeo was a decade back, and it t

S Parameter in spectre and ADS

I have also simulated same circuit in goldengate with s-parameter analysis and it has given noisefigure interms of NF(1), NF(2), NF(3) . My question is why we dont get noise figure in specter in terms of NF(1), NF(2), NF(3)

how to simulate the input refered noise of an integrator in cadence/spectre

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

Hi i am trying to do noise analysis for a four-quadrant multiplier with two inputs i1 and i2. The output is obtained by driving it through load resistor of 1K. Now when i do noise analysis both the input and output noise are the same with no change. The steps i did were Chose noise in (...)

Spectre F and NF calculation wrong?

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

Linear interpolation

Good morning, i wrote a simple text file as "noise file name" for a Vdc (analogLib) in cadence. When i plot the PSD, the first region (flicker noise region) is characterized by "humps, because of a non linear interpolation, i suppose. How can i select a linear interpolation for these point? Thank you! Dario

How to generate a clock signal with random noise in Cadence Spectre?

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 (...)

Question about transient noise option under transient analysis of spectre

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 (...)

VerilogA VCO Model to Simulate Phase Noise

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 (...)

Amplifier biasing: Methodology?

Hi, I´m 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). I´ve been told that the first thing is to define the appropriate current (...)

PLL System Behavior Simulation on Transistor Level

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

Single mosfet noise simulation using spectre

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

how to calculate noise factor in cadence?

I am using spectre to measure the noise performance of my schematic with spectre in Cadence . I wonder how the software to calculate the noise factor with the input noise and output noise . The simulation results show that noise factor doesn't equal to (...)

why error detected in simulating sp in spectre

always error detecting in stimulating sp analysis:　write error on PSF file: Error detected in psf library while writing to file 'sp.noise.sp'. I am simulating LNA now, but I guess this is not the circuit problem and maybe something wrong in the setting of spectre. Does any have this problem before? Pls help me! Thank you!

How to simulate 1/f noise reduction of CDS in simulator

Hi, I have designed CDS circuit. As given in literature, CDS reduce Flicker noise and sampling noise / KT/C noise. I know that, we can calculate KT/c through Transient noise simulation in spectre. But, Please, let me know how can we simulate 1/f noise reduction through CDS

phase noise to jitter

hi ..... can any one help me .... i need a matlab script in how to convert the phase noise to jitter 76391 i need a script in how to do this equation in matlab as i use spectre simulator and i want to know how i use the phase noise graph to put it in the equation by matlab

Hi~ I simulate noise of a fully differential OPA switch cap structure using spectre Pnoise . I have some problems First i use PSS and Pnoise analysis , then i want to see input referred noise , and it is impractical small , just about 20nV/Hz (better than IEEE papers so (...)

Spectre equivalent of .MEAS NOISE?

Greetings, In SPICE (like LTspice, Hspice) I can do .noise analysis and measure the total input-referenced noise using .MEAS noise in_totn INTEG V(inoise) How can I do the same in spectre? I know that spectre supports 'simulator lang=spice' and (...)

What value of port impedance should be in Noise simulation with Cadence Spectre?

Hi guys, I've gotten something unsure about noise factor. Hope for help here. The noise Factor is defined as below. N = (Na+G*Ns)/(G*Ns). Different Ns produces different N. and in Cadence spectre, the noise source is usually a port. The impedance of the port provides the thermal (...)

RMS accumulated jitter increases with increasing number of sidebands (pnoise)

When I simulated the phase noise of a ring oscillator based VCO using spectre pnoise analysis, I found the rms accumulated jitter increasing with increasing the maximum number of sidebands. and the dominant noise contributor was the induced gate noise of some swtiched off (...)