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155 Threads found on edaboard.com: Differential Mode Output
for the three kind of opamp:telescopic cascode, folded cascode, and two stages opamp with differential input(five transistors) & common source output & miller compensation, what's the difference of them? for example, gain, output resistance,input common mode range, output swing, noise, speed, power (...)
In any balanced circuit, odd harmonics circulate in a differential path, while even harmonics flow in a common-mode path. is this phrase correct? why? sorry but I can't understand it :?:
the output of integrator will step up if you apply a positive dc input. if you use fully-differential structure, the common-mode voltage of two outputs of opamp will be maintained on what you set by common-mode feedback. this is a method to find the finite gain of opamp. in general, i simulate the gain (...)
is there any obvious benefit of using a differential OTA over using pseudo differential structure (two single ended OTAs) as i see that the only issues are PSR and CMR? are they worth it, given that the complexity of the differential OTA (like needing CMFB)? i.e. cannot we like match the two SE OTAs enough not to notice the difference?
hey i have recently been given a semester project where i have to design a telescopic fully differential OTA (see the picture). i have been given the following spesifications: Specification for the OTA: Parameter Value Small signal gain (dVo/dVi) > 40dB Unity gain frequency (f0) > 600MHz Input common mode VDD/2 +- 300mV output common (...)
i am have to do a sar adc project the input is differential and the comparator must be fully differential does any one have material about a differential dac or can explan to me how it works
For two stage fully differential op amp, both first and second stages are fully differential, do both stages need their individual common mode feedback circuit? or just the second stage need common mode feedback circuit. Thanks!
Hi Hajer, Use the same setup as your analysis for the differential mode gain ... and just define your input noise source as the source which you have connected to your input devices. AC analysis gets executed first and then noise analysis. You can see the output noise and input referred noise from the direct plot utility in ADE ...
I observed that my CMFB circuit is limiting my amps output swing when compared to the circuit without CMFB. Does CMFB circuit really limit the output swing while forcing a common mode output at the differential output stages?? One more doubt I have is how to test the pulse response of a (...)
Hi, I have an LVDS output stage like the One in Bonis paper (aks if you need it) connected to an mtline model. Now I would like to simulate something like S22 in order to have a reflection over frequency plot for common-mode and/or differential signals by doing "pss" - possible to do that ? (how ?)
the opamp is differential, so the output voltage is just the common mode voltage of output. it's not the offset.
No S3 sets the OTA input common-mode- you can use the same idea for a fully-differential amplifier. Also, it means you are using an OTA which can have same input and output common mode. Bupesh
i've been working on differential output op-amp and i found that common mode feedback(cmfb) is an important criteria for that but i was able to find only theory about it.... can somebody help me with some circuits.....
More infos: The LNA has common mode rejection or not? Do you take differential output or single end one? The noise contribution is relevant or negligible? Mazz
For differential output opamps you need cmfb circuit to set the output common mode. For single ended opamps its set by the current mirror load. About designing opamps to get rail to rail output .... its simply not possible. The best output dynamic range you can get from an (...)
for single ended that the out put is between a terminal and the ground for differential output it means that the output is between two terminals neither of them is the ground.
We used the Xilinx Virtex2 in past projects. I do not think it has a differential output mode. It only natively supports differential inputs. Here is how we got differential outputs clocks. For the "positive" output terminal, use a the DDR output (...)
1. First question and most important is WHY is the input referred output noise for small Gains so huge and for bigger G much smaller? Input noise is constant and shall be amplified by Gain. Why is this not the case ? Gain, usually means differential gain, acts upon wanted signal. Noise, regarded as common-mode at the input, gets
hi in virtex i have a clock at 20mhz in common mode i would like to generate 100mhz in differential mode thank s in advance
We used "differtial circuit", "single ended circuit" to decribe our circuit. It is for input and not output, right? I mean, if my citrcuit is differential input and single ended output, the circuit contains a dif-to-single converter in it. We still define it as differtial block, right? Thanks


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