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Current Shunt Feedback Amplifier

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1000 Threads found on edaboard.com: Current Shunt Feedback Amplifier
I couldn't find out what would be the gain for this given circuit given the open loop gain of This is my guess I can find that the loop gain Aβ is equal to gmRd which
Hi, there: I am currentlly involved in a project of broad-band LNA, and the basic ckt is the shunt feedback amplifier, after reading some articles and papers, i find some authors assume the gain to be -(gm-1/Rf)/(1/Rf+1/Rl), or in case of large Rl, gain=(1-gm*Rf), where Rf is the feebback resistance, Rl is the load (...)
Hello, I am doing some hand calculations of a simple shunt feedback amplifier (common source topology with resistive feedback). To take loading effects into account, I am following the y-parameter approach described in Grey and Meyer. My transistor model includes gm, ro, Cgs, Cgd and Cdb. As expected, the final (...)
can anyone suggest some architcture for current feedback amplifier or some sudy matter relevant to this topic.
Hi, I need to design a CMOS current feedback amplifier. I have looked up a few papers but haven't found much. Could someone suggest tutorials, papers on how to design a CFA in terms of sizing of transisitors and small signal analysis? Thank you.
for series...the current remains unchanged as tat of the input ...and voltage is added or subtracted... for shunt ...the voltage remains unchaged as tat of the input ...and current gets added or subtracted.. same thing applies to the output see some basic books...like.. Millman and halkais ,etc
I don't know how to design circuit of shunt feedback transimpedance amplifier Can someone teach me ?or show me some example ? appreaciate your great knowledge thx Is this circuit for shunt feedback transimpedance amplifier ?
Hi all, I want to use the INA122 as a current shunt amplifier. I have attached the schematic here. I want to know before I connect this to power whether it is correct or not. The two diodes are to drop the voltage to the + and - pins by about 1.2V BTW when I simulate the circuit it does
Hi All, I want to design differential IF feedback amplifier. Can someone suggest some references? Thanks
Hi Guys: Attached is a topology of a shunt feedback buffer. M2 provide shunt feedback and that M1 and M2 form a two pole negative feedback loop. This circuitry draw least power consumption compared to the common source follower buffer stage .Due to voltage headroom limitation I'm using a resistive (...)
In the attached papar, Gilbert said: the AFA can provides accurate performance right up to its unity-gain frequency. Why? Does anyone has any idea about this? the model of the active feedback amplifier is shown in figure 3 of the attached paper. Thanks a lot! Jiwei
Any books about RF feedback amplifier design suggested? I want learn how to design a feedback amplifier in RF application. Thankyou!
IS there a relationship or rule between the bandwidth of the main amplifier and the common mode feedback amplifier, which is to be followed such than a differential amplifier has good common mode stability .i.e should the cmfb opamp's wu must be greater than that of the main amp's wu or somethinglike tat
Hi, Is it necessary to use the inverting input of the voltage feedback amplifier (VFA) to amplify the photocurrent signal from a photodiode? Can we use the noninverting input configuration of the VFA? Thank you.
Anyone heard of maximum continuous output current of an amplifier? I mean, I can understand the definition of peak output current, but what is the definition of maximum continuous output current of an amplifier? and if possible, please explain how to simulate it in the cadence. Thanks in advance.
I wanted to design an current mode operational amplifier with differential input and differential output as a part on my project. I have referred a few papers for the same but what I find missing in the papers is the biasing circuits required for the current mode op-amps. I need any reference that can provide me help with the biasing (...)
A good resource would be from Nat Sem website. They have good information on current feedback amplifiers.
Hi, I m trying to use a current feedback operational amplifier (analog device AD8001AR) due to high bandwidth capability. I don't know why I can't get higher voltage gain as seen in following picture, the input voltage is 1V and the maximum output voltage obtained is 2.5 Volts. I tried to adjust the voltage gain by varying the (...)
*When the feedback signal is derived from an output voltage (current) it is voltage- (current-) driven feedback. *When the feedback signal is added to the input voltage (current) it is a voltage (current) feedback. *Example 1: opamp as a non-inv. (...)
73335 current-Sense amplifiers (CSAs) current-feedback Architecture
The straightforward method to make a constant current amplifier has been described by audiomik in post #6, unfortunately it has been ignored yet. The only limitation is that the load must be suited for floating connection between amplifier output and current shunt, usually no problem. As another point, an (...)
it is used to prevent the occurence of metastable state in the inverters by the usage of feedback... also it increases the current sourcing ability of the buffer and decreasing the output impedance...
hi all i need to design an active load current amplifier with output voltage 30V and output current at least 5 amp (rms). please help me i am not experienced with current amplifier. thanks alot.
Search about: A Simplified Method of feedback amplifier Analysis Rosenstark, Solomon Education, IEEE Transactions on Volume 17, Issue 4, Nov. 1974 Page(s):192 - 198 Digital Object Identifier 10.1109/TE.1974.4320925 Summary:An exact asymptotic method is presented for performing gain calculations on feedback (...)
Hi, how do I simulate a bode plot of a current feedback amp (cfa)? The known testbench from the vfa doesn't work because of the feedback resistor.
I don't like this terminology at all, because - for my opinion - it is confusing. And according to my experience, it is used in different ways. Some authors use these words based on the sequence input-output and some vice versa. Based on the input-output sequence, the phrase series-shunt feedback means, that the feedback signal is
You can use a high side shunt monitor amplifier like INA138 amplifiers and Linear - current shunt Monitor - INA138 - or a OP differential amplifier.
I think you need to show how you are getting you results. If from simulation then it would use a current source and the output voltage should relate to the input current and feedback resistor. Keith
Audio amps normally use negative feedback to reduce distortion. It also reduces the gain and widens the frequency response. Positive feedback would make the distortion and frequency response worse. The hearing aid you showed uses negative feedback, but only to stabilize the DC operating point. At audio frequencies the (...)
First of all I am right in saying the network formed by R1, Rf and Cf is the feedback network and can you pls explain why its is a voltage feedback. During formulation of an answer I have detected an error in my first response. Sorry - it is voltage-controlled current feedback (sometimes called (...)
hey guys.... I want to make a voltage buffer... i.e. a unity gain amplifier from a current feedback help....
hi.. has anyone knowledge about filter designing using current feedbak operational amplifier (CFOA). I have written program in pspice for filter which realises LP, BP & HP filter responses at different o/p nodes but i didn't get proper result. Pls help me.
LDO feedback is series-shunt samples voltage and returns voltage. The output stage MOS current goes of course to the load. Think of it as a capacitor which the load drains and the LDO fills. The voltage sense determines if the you need to increase/decrease the charge "flow".
For my opinion, the terms "voltage series" or "current series" are somewhat confusing because it is not inicated what is (a) the controlling quantity and what is the controlled quantity. Hence, I prefer expressions like "voltage controlled voltage feedback" (which, for example, applies to non-inverting opamp circuits). In the actu
What do you mean by hidden feedback. If you mean a feedback that is not obvious by the first glance then the source degenerated (or emitter degenerated) amplifier is a good example, where the source(emitter) degenerate resistor is a feedback. It is actually a current-voltage feedback or (...)
There are many types of amplifiers, such as high gain, low bandwidth and vice versa, voltage/current mode. Error amplifier is just a name of a amplifier that usually compare the difference between two signal. Therefore its main characteristic is the gain of the amplifier because the larger the gain, the (...)
Dear Noiseless, In a differential configuration, the VOCM, which is the reference for O/P CM programs the Output CM Level. The input level can be given at any level, which due to the virtual ground will have its own level. Importantly, since there is a virtual ground at the input, the difference in the CM Levels of the input and output will c
Hello everyone, I'm Attempting to convert a Playstation 2 power supply from a single rail 12v supply to a 2A constant current supply to drive a stepper motor. I have been unable to find a circuit diagram for the item but I have been able to deduce a few things. ( If anybody has a copy of the circuit feel free to let me know :), ) I have worked
Does anyone have any comprehensive material for finding loop gain using breaking the loop method. Actually I am trying to find the loop gain, phase and stability of a Transimpedance amplifier (input current - output voltage) using this method. It consist of only a single transistor with a feedback resistor from collector to base.
I advice you tou read or any Application Note on the current feedback amplifiers Comlinear CLC400 for rxample
Hi, I designed a current mirror transimpedance amplifier by using 0.13?m cmos.Now I got 60db gain & 3.2Ghz bandwidth.But my desire bandwidth is 10Ghz.I used 1amp current source through bondwire inductor, Biasing voltage=1.3v Q1=28?m Q2=36?m R1=2K R2=1K Anybody can suggest me, how can I got my desired BW by using these (...)
i'm talking regarding the current series feedback, voltage shunt feedback etc.....
yes, but a negative feedback will cause a lot of power assumption, right? I do not want to consume energy. My current new design is using a degenerate common source amplifier, is there some better single structure. Thanks
Hi I want to study the design of current mode circuits. I need an introduction about cmos current mode circuits (amplifier) and their types.
Suppose now there is an amplifier with negative feedback loop. If this amplifier has a capacitive load, is this circuit susceptible to oscillation? and why? If yes, what is the correlation between oscillation and the value of this capacitance? thanks
A power OP, e.g. an ADSL driver is basically a possible solution. If you only need an undidirectional current, also a single output transistor with a feedback amplifier.
Hello ! If I have a folded cascode amplifier, and when the cascode transistors can not connect their bulk to their source, when the cascode transistors have very big leakage current, what and how this will drawback the performance of amplifer? It will reduce its transiconductance or something ? Thank you very much !!
To analysis a simple differentiator build from an op amp with a resistor R and a capacitor C in the negative feedback path, when can i simply assume the capacitor being shorted? In that case, is this configuration equivalent to a shunt-shunt-feedback transimpedance amplifier? Thanks.
Why have to divide by 200u ? Transimpedance = voltage/current. Your voltage output is 91mV, the current input is 200uA. Keith.
I hav to design a negative feedback ampilifier using common collector configuration...negative feedback is obtained only when there is phase shift of 180 degree...how is it possible with a common collector which does not produce phase shift at output??? Well, it sounds more complicated as it is. A common collector