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302 Threads found on Gain And Unity
Hi again. It's not a regulator it's a 2 stage amplifier (thr basic 2 stage amplifier) and I am trying to perform a current step at the output, taking into account it is connected in unity gain. If the step response is slow, it means that Closed Loop Bandwidth is too narrow.
Hi, From the little I know, op amps with feedback can become unstable and oscillate due to poles and zeroes, something or other about unity gain at the crossover frequency. A zero introduces a phase shift of +90? and boosts the gain by some amount in dB, a pole introduces a phase shift of (...)
I don't see any sign that you are doing this analysis in closed loop configuration (which is the only way PSRR matters). Setting it up as a unity gain follower would give you a reasonable answer / expected behavior.
A common source stage will only be a unity gain amp either under very specific bias, load and process conditions, or when driven in a feedback loop. It will be hard to stabilize across all. The common {source, emitter} stage is a voltage amplifier and to reduce its gain to 1, needs a (compensating) (...)
For a MOSFET, while deriving the transit frequency wT (defined as where the current gain is unity), it is common to neglect the current fed forward through Cgd (i.e. the output current io = gm*vgs and not gm*vgs-jw*Cgd). What is the reason for doing so? No - that`s not true. That is the only input current
A system can have any number of poles and zeros below the unity gain crossover. For stability, we need only a good first order roll off around unity gain crossover. Your example of (1+s/wz)/s^2/wu^2 is perfectly stable. This is what happens in a pll or in a multipath opamp/feedforward opamp. Another example (...)
So I connected the folded cascode I designed in unity gain feedback configuration and swept the non-inverting input between Vdd and Vss to estimate my ICMR min and max. The graph is attached. I then shorted both the inputs and connected them to a DC source supplying a voltage value (for (...)
Text books are usually assuming a second order transfer function with two real poles, under this assumption you can sketch a bode diagram using the given information. Use phase margin and unity gain frequency to determine the second pole, the first pole is fixed by the gain. Existence of a gain margin (...)
You see loop gain indicated in an amplifier open loop gain diagram. The point "way down" is unity gain frequency. Feedback factor < 1 is the missing link. Read the text completely beyond the quoted part.
what's Wu comes from? It's caused by which pole? Wu is unity gain bandwidth which determines your phase margin | H(Wu) |= 1 and in order to see phase margin we look to the point where gain is 1 or 0 in dB domain. what's g1 and gL g1 is 1/R1 and gL is 1/Rl why (...)
i have attached a pdf image my doubt is whether it is an unity gain amplifier. the schematic is taken from ad 7321 evaluation board kindly help131817
In your block diagram, use have used the classical symbol for an opamp (voltage-in and voltage-out). Hence, in my previous answer I have assumed that you are using such an amplifier (off-the shelf). However, in case you are designing another amplifier by yourself (which - as it seems - has no low-resistive voltage output) you cannot use the gain ex
I suggest you start injecting signals into an active load and monitor V,I for gain phase stability. You can get a sweep generator from Audacity, and use the audio inputs AC coupled as required to measure the response in time and frequency spectrum, or use scope for unity gain (...)
The DG cap does not mitigate the miller effect, it utilizes it. The purpose of miller compensation is pole splitting, creating a dominant low frequency pole and shifting the other pole to higher frequencies. Compensation is dimensioned according to the intended open loop frequency characteristic, e.g. an unity-gain stable OP which allo
did you try to reverse the speaker polarity? If feedback is in phase at >unity gain, it will cause oscillation or howling. IF phase shifts 180 deg, at different f, but at a higher feedback, then a quality factor of non-linear response as AG indicated is your problem. Generally cheap mic's have background noise cancellation by having a balanced
to make analog amplifer, I connect negative feedback and phase shift of amplifier should be below 180 when amp gain is unity gain because if not, output of amp is larger more and more or oscillated. But when that conditions are satisfied, how can i prove that amplifier is not oscillated? for example, (...)
Hi, I need a Component. I need some kind of Buffer which can drive Signals from DC to 1Ghz at really low jitter somehow around <50 fs and it has to be bidirectional I first thought of a tristate - but low band then unity gain - no bidirectional function My next idea would be taking unity (...)
An integrator uses maximum DC gain not unity , so it does not need to be unity gain stable. It does need to have very low DC offset. You may be confusing the fact that Op AMps are integrators with internal small compensation and are thus often unity gain stable. When they (...)
Hi, I've seen a few sources post the following and needed some clarification. Thanks in advance: 1. IIP3=Pin+(Pout-IM3)/2 2. IIP3=Pin+(Pin-IM3)/2 Is #2 valid only if the gain is unity (Pin=Pout)? Or is there something else I'm missing? -Robert
Hello, I'm planning on using the buf634 as current buffer inside an opamp loop as described in the datasheet in figure 24. In my application the buffer will be connected to +/-15v supply with +/-11.8v 400hz input The output current can reach 220mA According to the datasheet the output voltage swing decreases with temperature and output

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