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92 Threads found on edaboard.com: Cascode Output Stage
The assumed first order gain characteristic isn't bad as an estimation. There's an additional cascode stage pole, but you can probably ignore it. The other expressions are however only right if C2 >> Cf, otherwise the amplifier output impedance matters. As a short cut, it's rather unlikely to drive an amplifier with a single gm (...)
Hello, I am attaching here a multi-stage cascode amplifier schematic operating at very high frequency at bw of 28GHz. A part I have understood about the circuit as following From RFin signal travels through L and C matching network then from source degenerated CS stage to cascode stage. The (...)
Folded cascode would be your current source limited gain stage. Class AB would be your source follower (or, a fancy-controlled common source) output stage meant to deliver any necessary current.
I am designing a single stage source degenerated cascode LNA. I have understood most of it theory regarding input matching but dont understand how to do output matching of thi LNA ? Hope someone can explain it to me. Regards Vipul
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. (...)
Hello, can anyone help me to unterstand the circuit in the attachement? The circuit is a folded-cascode amplifier with a second current input amplifier structure (what is the circuit with M8-M14, the 2 current sources and R4,R5 doing)? Why do I need especially resistor R3 (to reduce gain of folded cascode structure? if yes why?), and what
Hello, This is my second ever post here. I have been a lurker for quite some time and love coming here now and then. Well I am struggling with a 2-stage amplifier design. I am designing a 2-stage, nmos input pair folded cascode amplifier. I am happy with DC gain, GBW, quiescent current, etc except for the Systematic offset. And I (...)
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 (...)
Consider that the absolute output range, and the useful output range will certainly differ. Once you start to bury the cascode devices, your Rout and your gain will drop big-time (as well as your frequency response into any significant output capacitance, change markedly). The matching of load and compensation to (...)
cascode differential amplifier can provide this GBW product.
If there is a large enough input voltage difference between vp and vn, all of I3 flows through either M1 or M2. This means that there is a current imbalance in the cascode stage, which is being levelled out by sinking/sourcing additional current to/from the output capacitor, which equals I3. So the fastest this can be done is I3/CL which (...)
gain of alone CS Amplifier is -GM*rd. Using the simplified transistor model assumed in your gain expression (infinite output impedance), the additional cascode stage doesn't change the gain of the basic CS stage. Your circuit however implements additional source degeneration. With Rs = 200 ohm and Rd = 100 ohm, the (...)
Hi guys, I want to design a full-differential two-stage OPA. The first stage is telescope cascode structure and the second on is usual common source structure. I want to use switched-capacitor CMFB to make the output common-mode voltage stable. I am wondering now that how many SC-CMFBs I should add in the OPA. One SC-CMFB (...)
When You designing two stage ota, the first of all You need to add a compensation network (e.g. Miller cap with nulling resistor or used a cascode compensation). Your amplifier is unbalanced - output transistor should be matched with first stage current mirror load. In addition the phase margin and GBW depends to feedback (...)
Adding a cascode stage in an amplifier increasing the output impedance. What the advantage of this?
how to add 2nd stage on single ended folded cascode? i cant figure it out,, kindly tell me, its urgent. im getting gain of 72dB and 100MHZ + ug FREQ. SO HOW TO ADD CS AMP to increase gain to 100dB???? im using NMOS input folded cascode
1. I guess that you wan a fully differential opamp in the end. So you would have to put 2 CS stages for each output of the folded cascode. If you want a single ended output, then have 2CS stages with a common current mirror load. 2. Is your folded cascode NMOS input or PMOS input? What is (...)
I'm going to design a two stage folded cascode OTA. first stage is folded cascode(nmos input pair) to provide gain second stage is common source to increase the output range compensation is cascode compensation My question is in my circuit, how to find poles and (...)
There are different cascode current mirror variants in use, some have low "saturation" voltage. You'll know the answer if you analyze the circuit details.
Hi! I am doing a class AB common source output amplifier with a folded cascode gain stage. The load is 1pF and 10 kHz. supply is 0-5V. the gain is > 70 dB Everything was working as expexted until I changed the DC voltage of the load. When loads are grounded the phase and gain are as I expected, but as I turn up the common mode load (...)