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High Swing Cascode

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28 Threads found on High Swing Cascode
First of all You have to understand how current mirrors works. Then, understood at least one high swing cascode CS and use them as load of your opamp. For this configuration 60dBs of open loop gain with shortest regular devices should be achievable (with 1GHz of GBW for this power and not too high load - sthing like a 1pF)
Yes as "@Analog_Domain" mentioned, you can use folded cascode op-amp but if swing is not a issue and you want to dissipate very less power (power dissipation is your concerned) then go for telescopic cascode . For high gain you can also use gain boosting in your op-amp with common mode feedback to insure your constant (...)
One possibility: For the first stage, consider using a folded cascode topology (with PMOS inputs) to get high gain with good voltage headroom. For the second stage, use a topology for low output impedance and good swing - eg a common-source stage with active load. You may want to consult a good analog IC design book (such as Razavi's) (...)
Any high swing cascode CM will works
Hi BartiebyScrivener I think: Vb2 = Vtn + Vdsat7 + Vdsat9 Vb1 = VDD - (Vdsat4 + Vdsat5 + Vtp) Choose Vdsat 7 + vdsat9 and (vdsat5 + vdsat9) small if want high output swing
Hi Dominik, Thanks for the help. My design requirement dictates that my output voltage swing should go upto 3.5V and as low as 0.5. Therefore, i need to use higher supply voltage. Even if i use a thick gate oxide transistor, i will have to use two of them in cascode. This is because thicker gate oxide transistor has breakdown voltage of (...)
M2/M3 is the greatest contributor to mismatch. So it needs to be designed for large A and large vdsat. M4/M1 is to be designed for large gm for high output impedance. M5 is to be sized such that M1/M2/M3/M4 is operating in saturation. Lastly, run all corners to ensure all transistors are indeed operating in saturation. Run Monte Carlo if you want t
good day everybody.. i'm doing simulation right now about high swing cascode current source. this is about the self bias high swing cascode current source. please refer below for the figure. (i found this circuit in CMOS Analaog Design by Allen, 2nd edition page 133.) In this (...)
Since you won't be needing a high output swing you can go for a single stage telescopic cascode differential amplifier that will give you a decent gain with good PSRR and low power consumption. The main problem with this is the systemic offset which may or may not meet your spec of BGR+10mV. Alternatively you can go for a typical (...)
Hello, I'm desiging a FCDA for a 60dB gain, high output swing. but, my load capacitor is variable from 20fF to 100fF max. I have a phase margin <45° can someone help me please? look at the attached file.
i advice u first stage folded cascode (PMOS as input) and second stage is CS (sure NMOS the input), this circuit gives u low in settling time and high gain with phase margin regards
An another point of view. Small bottom MOST only is used in high frequency application. If consider low offset, noise applications and bandwidth trade-offs mirroring MOSTs must operate at strong inversion level with small value of Gm. Usually this gives small W/L ratio (high ro1). Influence of cascode MOSTs on offset and noise really (...)
the vds if M6 is set by the vgs of M5 which in turn is set by the size of M5.This is a high swing cascode. mostly used as a load in cascode opamps(folded,telescopic etc) amarnath
try this book
what are the advantages and disadvantages of folded cascode amplifier?? Can be designed rail to rail input voltage.... low output swing... high output impedance.....what else??
what process will you use. your current is quite high.
There is another question about device sizing of the other high-swing bias circuit. What does the objective "VDS1=R*Vd1,sat" mean ? And why Vd6,sat equates Vd1,sat in advance!
i have an op-amp which is used for LDO. the Vref is about 1.16V. At that point, my op-amp's offset is ~6mV will this a problem for my LDO? How to lower the op-amp offset? my op-amp is only one stage op-amp which using high swing cascode current mirror as load current. thanks in advance :)
2) And then this is really confusing. Since I'm designing a cascode, I should be able to get a high gain from this stage. But, 0.016V at the output, and 0.25v swing at the input, it seems to me that this stage is decreasing the gain. how could that be? Hi airboss, I think a little explanation could clarify u and meet
I am designing a opam with 70-80db gain, and more than 20MHz bandwidth, and real-to-real output. Can some one give me some suggestions about the structures? THANKS GDHP
Because source followers suffer bad performance due to body-effect + they need high voltage ( swing will be within Vgs of transistor .. can be large for low suppliues ) whereas common source provides higher swing, no body effect
Large transitor length will help you get high gain. Maybe simple fold coscade is enough for 100db gain
send me a design example of high swing cascode with both PMOS and NMOS devices. Thanks in advance
A full differential amplifier with 0.13um process,the threshold voltage is about 0.3v.I want a GWB of 800MHZ(1pf capacitor),Gain of 80dB,and the output swing is -0.3~0.3.
i am trying to design a triple cascode (telescopy) OTA, but I don't know how to generate the BIASing structure of this high swing OTA. thx
Hi there, i've failed to bias wide-swing cascode current mirror properly using 1.8V supply. The circuit i used is Fig 6.11 from Ken Martin book. Is it impossible to bias 4 transistors in cascode because of 4xVdsat? I need high current so that i can reach high slew rate. Can anyone help me or give me (...)
Here is your standard fully diff. folded cascode op amp. Im using 0.18um technology, 1.8V supply. Im not getting the correct open loop output. My open loop gain is way tooo low. Cant even get a gain of 1. I know that all transistors should be operating in the saturation region. How do i go about setting all transistors to be in saturation? Do i set
Hi.. any one know any technique which can be used to design a current mirror capable of providing 10mA with low voltage headroom (less than 0.3V for the transistor to operate, the signal swing takes about 2.7V with 3V power supply) and high output impedance (more than 5k)? Is it possible cascode current mirror can achieve such a low voltage (...)