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103 Threads found on edaboard.com: 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 output voltage. (...)
From the picture seems like the definition of cascode is 1)128592 1)The input tansistor turns from nmos to pmos. or if differential, turns both nmos to pmos. 2)insert a current source between the input transistor and the upper load transistor. The objective is improve the output swing and input swing. Is th
How do I prove that voltage swing is much better in a folded cascode compared to cascode?
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) which wil
I view that difference in resistance as trivial, and probably due to the operating point differences between wide swing and classical cascode operating points. The Vds is likely partitioned differently and my gut feeling is that the classic version has the guard (upper) running with lower Vds, so closer to linear and less improvement to Rout. You m
i have designed two stage fully differential OPAMP. i have theoretically calculated output swing, it is coming 172mV to 945mV. power supply is 1.2V in 65nm technology. for checking in voltage swing in simulation i have connected it like a buffer and input sweeped fron 0 to vdd. but output is not tracking input at all. i m attaching plots. plz tell
Hi guys, I want to design a folded cascode with a total current consumption <20uA. THe design I made I am struggling to get 60? of PM. In this situation should I use a capacitor to improve the PM, at the output?
Any high swing cascode CM will works
u will get extra swing (~200mV) at the cost of power (~double) and nondominant pole..
I am a student and am not developing a product but a prototype. To reduce design time, no voltage reference will be designed on chip, and I consider these two methods to bias the current mirror. Assuming that the bias voltages and current sources are noiseless, it won't change a thing. However, a much more important problem
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
Hey! I'm new to analog circuit design and am looking to design an op amp that can provide following specs: DC open loop voltage gain > 100 dB Unity gain bandwidth > 100 MHz Phase margin between 70 and 75 degrees at unity gain Vout swing > 2.0 Vp-p (single-ended) Load capacitance = 1 pF Minimum Von for all saturated FETs = 200 mV Process te
1-In order to give max. swing to M1, Vdd has been used.Otherwise Vds of M1 will be lower so consequently swing will also be low. 2-RF chokes are useless in RFIC circuits.Instead using a resistor will also supply wanted gate voltage.Because there is practically no DCcurrent flows. 3-Ls inductor is used to able to play around input impedance to get o
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 2.5V in te
You have ben asking about output swing, not linear range of the transfer characteristic. The latter is already limited by the differential pair input stage,
I am getting less ouput impedance for the swing circuit. I think this is because M6 (in the wide swing version) operates in deep triode region and thus has a rather low output impedance. Actually the cascode advantage is nearly lost. You trade output impedance against wide voltage swing.
Hi all, I designed a folded cascode amplifier,I want to get 1vp-p ((vin=sin(12x ))swing from diff out of opamp. shoulde first pole of folded cascode biger than 12x????????????
Hi everyone What is the range of Gain, Output swing, Speed, Power dissipation and Noise in Telescopic, Folded cascode, Two Stage and Gain Boosted topologies of operational amplifiers? or suggest me where to find there ranges. its very urgent. kindly reply to this post. Thanks in advance.
hi... I'm trying to design a wide swing folded cascode amplifier..I'm following the design procedure in Allen Holdberg...But I'm getting devices sizes with w/l <1 for some of the it valid? Or should I readjust the sizes by changing gm/id? Thanks in advance