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155 Threads found on edaboard.com: Differential Mode Output
Hi, I have designed a fully differential opamp.It's a folded cascode archtecture with gain boosters.Each module has it's own cmfb circuit.After adding the cmfb and after substistuting all ideal things of the schematic (dc voltages sources) with the respective biases from the biasing circuitry,i notice that my output node's common mode (...)
If your opamp is fully differential, do you have CMFB circuit for the output common mode? If yes, and if it's reference is different than 0.5v, check what happens with it and why it is not able to control the output common mode. Attaching a circuit will be helpful.
Not sure about an article, but for any differential amplifier it is important to look at the stability circles in both differential and common mode (i.e. tie your inputs together and drive it with Port 1, and tie your outputs together and connect it to Port 2). Make sure to look at all your stability circles up to Fmax of (...)
It's normal... you watch these wavefom single ended and differential oscillators create such waveforms.Because the voltage at each branch rises from zero and reaches to VCC but due to treshold voltages of the output source followers, waveform never drops to exactly zero.Around zero voltage, the MOS is almost OFF ( or weak inversion mode ) (...)
A 100 uH to 1000 uH choke with a could coupling (low differential mode impedance respectively leakage inductance). I previously used Wuerth SL2 for a similar 13.56 MHz transformation. At 40 MHz, you have a considerable effect of leakage inductance, it would be possible better to use a mini-circuits RF transformer. As another point, the transform
Your ammeter cannot take high common-mode voltage levels and that is why it blows. You could use a sense resistor in the positive rail to measure current, and use a differential amplifier to bring the voltage drop across that resistor to some useful levels. Or use an instrumentation amplifier. Use a voltmeter at the amplifier output. (...)
I have designed a fully differential op amp. I do not know exactly how to measure the slew rate for a fully differential op amp. Generally for a single ended op amp we connect the op amp in non inverting(feed back) mode and measure the slew rate. How to measure the slew rate in case of fully differential op amp?? Plz do (...)
Testec differential probe and similar are actually not isolated probes rather than differential amplifiers with good common mode rejection. The differential amplifier is still referenced to the output (oscilloscope) ground and uses compensated resistive voltage dividers to achieve the common (...)
hi, I have a differential CML Buffer with resistance as load. It runs at 20G/Hz. What's the reasonable way to get the DC value for one output ? Best Wishes Gang
eem2am, A differential amplifier does amplify differential mode noise appearing on its inputs. If you know the nature of the noise, you can somewtimes filter it at the amplifier output. However, if the amplitude of the differential input noise is large, the amplifier may saturate, and filtering the (...)
in designing an fully differential integrator for a second order sigma delta modulator. how to choose the input and output common mode level voltages for the OTA used as integrator. Help me please, its urgent. Thanks in advance.
The inductor in front of the differential LNA will improve the common mode rejection and also to reduce the second-order distortions.
I am using a differential to single ended opamp. will it have any common mode problem. common mode feedback required or not ?
Hallo, I designed same config..Fully differential with cmfb. Can you please upload the schematic..just screenshot.. so that i can help you, Thanks
In the general way, the preamps of a flash a/d converter are differential outputs amplifier. If the output common mode voltage between two output terminal are different, then the common mode noise will become a huge problem. Hence, we will add a common-mode feedback circuit (...)
1) For impedance matching. 2) To convert a single-ended output to differential mode.
In AD9779 datasheet, The default settings for the evaluation board allow the user to view the differential outputs through a transformer that converts the DAC output signal to a single-ended signal. On the evaluation board, these transformers are designated T1A, T2A, T3A, and T4A. There are also four common-mode (...)
In AD9779 datasheet, The default settings for the evaluation board allow the user to view the differential outputs through a transformer that converts the DAC output signal to a single-ended signal. On the evaluation board, these transformers are designated T1A, T2A, T3A, and T4A. There are also four common-mode (...)
I won't worry about noise at all since your output is differential. All noise contribution from CMFB loop is common mode -- it won't be visible at the differential output. Resistor sensing will cause lower differential mode open loop gain at the output - (...)
Hi, Suppose I design an fully differential op-amp having different input and output common mode (say ICM=0.75V and OCM=1V) and I will use this op-amp in a SC circuit. During the amplification phase, due to high gain of the op-amp, the input nodes of the op-amp are at the virtual ground. My question is what is the value of this virtual (...)