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23 Threads found on edaboard.com: Switch Cap Simulation
Hi Everyone, I would like to understand, what is actually causing ripples at the output of LDO design whenever there is a current switching, etc 0 to 30mA ?. In my test simulation, i'm including a ideal current source to switch from 0 to 30mA and the load cap about 100pF. I'm seeing the output transient ripples about (...)
thanks, kennambo. in theory this is well understood, in switched-cap we also simulated with clock, no problems. I just first time to do transient simulation check with a constant voltage. yes, it is like a diode connected, it always at saturation region since the gate and drain are connected to VDD, the effective resistance of the NMOS (...)
gm/Id is mostly for DC operating points and small-signal parameters. switched-capacitor circuits will require a transient simulation. You may get a good starting point with gm/Id, but you'll have to do simulation-based sizing (tweak-simulate-tweak) anyway, maybe with an optimizer software, and could start with it right away.
Hi, I am trying to design a switch cap DC-DC converter in Cadence (Spectre 6). I tried to use ideal switches and caps. With just an output cap, converter converged to desired value in transient simulation. When I tried to add a dc Iload in paralle to Cout (to model the loading circuitry (...)
To simulate periodically time varying circuits Cadence provides pss, pnoise, pac etc. simulations. There is a pstab simulation that can be used to simulate stability of switched cap or chopper circuits. Have a look in the documentation for it.
hi, I design a bootstrapped switch used in a simple sample/hold circuit( a bootstrapped switch with a cap load). The bootstrapped circuit and simulation result is in the following graph. In the simulation, the blue line is a ideal switch result. the red line is using a bootstrapped (...)
Hi, Can any one help in doing in noise simulation of SC integrator - part of a incremental sigma-delta ADC? Any good reference or simulation type details will help a lot. Thanks Sanku
Hello All, We use pac to analyze the ac response of switch cap circuits in spectre. Is there any way to analyze ac-response of switch caps in spice ? Best Regards, Sumit
I am trying to simulate delta-sigma modulator with HSIM (it is said it is faster than Spectre). However when I look at the voltage across the sampling cap, there is around 0.5 mV numerical error (Spectre gives right result). It seems like the voltage keeps going to the right value at first, but never makes the last step. I try to tweak the simulati
I am trying to simulate delta-sigma modulator with HSIM (it is said it is faster than Spectre). However when I look at the voltage across the sampling cap, there is around 0.5 mV numerical error (Spectre gives right result). It seems like the voltage keeps going to the right value at first, but never makes the last step. I try to tweak the simulati
It's a discrete time system, so how to do AC simulation ? thanks!!!!
I'm designing a switch cap ckt now and I want to get a graph of "Vout vs. temperature" for my ckt simulation. does anyone know how to get this kind of graph? thanks. I'm really in urgent. BTW: as far as i know, for a sw cap ckt, you can't run dc analysis because for dc, the sw cap is open ckt. the only (...)
I'm designing a switch cap ckt now and I want to get a graph of "voltage vs. temperature" for my ckt simulation. does anyone know how to get this kind of graph? thanks. I'm really in urgent. Simply do parametric sweep with temperature. What analysis engine do you use, transient or PSS/PAC ? If you use transient, what styl
it's the convergence problem. i suggest you use the spectre as simulator to simulate switch cap circuit.
Hi: SIMPLIS (simulation for Piecewise-LInear System) is a computer software package specifically designed for the simulation and analysis of switching power supplies. SIMPLIS has a small-signal frequency-domain analyzer specifically designed for the analysis of switching piecewise-linear systems. The analysis is based on (...)
Does anybody know how to do ac analysis for switch cap circuit? Thanks. For example, the simplest switched circuit used to simulate R. How to use spectre's ac analysis to do some checking? In my circuit, one switched cap circuit is used in the gain booster amplifier for the main OTA. I want to use (...)
ac cannot simulation it. use resistor to replace switch cap.
for the OPA with swith-capacitor common feedback, it is controlled by two clock signal, how to simulate the bandwidth and gain of this type of OPA to replace the switch cap by large resistor can smooth the simulation
Hi All, I am simulating a two phase switch-cap sample and hold amplifier, and trying to compare the performance between using the ideal switches (G-element) and the real switches (transistors). When ideal switches are used, equivalent capacitance is also added to each node to model the (...)
build an ideal CMFB with vcvs, cap etc. do not use switch you can gain the same function
S/H switch use "dummy Mos" can really reduce charge injection , I ever use 1/2 size dummy Mos siwtch , but simulation sitll have charge injection maybe small switch W/L reduce , and reduce parastic cap for reduce clock feedthrough
Hi switch cap use clock for get equ_R valuse , and I simulation AC response by this method .. but if clock have gitter .. how to simulation it in hspice ... in .tran simulation we can monitor switch_cap and get a "resistor value" but in (...)
may i the detail of using @ds in switch cap simulation? you mean @gilent @ds?