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155 Threads found on Differential Mode Output
You should use 100R or 250R 0.1% 1/2W resistor in sries in 4-20mA loop,then connect it to a instrumentation amplifier (differential to single ended conversion,common mode rejection) then do some filtering and ADC should cancel 50/60Hz noise.
If you designed your fuly-diff amplifier in the right way, your common mode output level is fixed, whatever is the differential input voltage. So, leave you amplifier in open loop and just scan the differential input voltage. The input offset is the voltage at which the differential output (...)
what is Pseudo -differential?
Hi, I have met a problem in designing an A/D converter used as mulit-biit quantizer in a sigma-delta modulator. The input signal is differential and with about 0.5V common mode voltage the output should be in thermocode format I don't know how to handle the differential input only find one paper about this in IEEE (...)
Have the output of your CMOS gate (CMOS logic) go to one input of a CMOS differential amp/gate. The other input of the diffamp will be a reference voltage .
I am working on a project where we have to interface a sensor and an A/D converter. the sensor output is differential centered around common mode of 1.5V (this is designed for the ADC). the sensor specs say nominal output impedance is 100 ohm and max load capacitance is 20 pf. also the ADC spec says the input cap is 7pf. Now (...)
These capacitors are used for compensation differential loop. It's possible to skip these capacitors if ur Op is compensated.
Should I use pss and pxf in spectre? Or just use ac and dc simulation to find the gain and phase margin? Could someone give me some help? Besides that, I can't measure the ocmr and icmr of the fully differential amplifier Thanks in advance. jack
use s parameter simulation with three port convert common-mode s parameter to differential (or mixed) mode s parameter file
The common-mode feedback is a negative feedback network that must be used in all amplifiers with differential output. This is because the feedback network external to the amplifier only sets the differential output voltage. For example if the gain of the circuit is 2, then the differential (...)
A weak cross-coupled inverters placed between two main inverters will mininimize the skew between the two signal and make them pseduo differential. Hope it helps. Another question:How to control the common mode voltage of the LVDS driver output? BR eric 8/15
Common mode feedback circuits are used in fully differential amplifiers (which have 2 differential inputs and 2 differential outputs) to define the common-mode of the two differential output voltages. This is needed because the external feedback path (...)
Basically what you want to understand is the effect that the variations in the common mode voltage and the supply voltage have on the differential output current. This can be done using a AC analysis were your AC supply is either connected in series with the supply voltage source or in series with the common-mode voltage (...)
Alternate approach (offset measurment): Assuming you are decoupling your common mode an differential input: 1) make a fine input DC sweep (e.g., from -5m to +5m with 100uV step) of the differential signal and measure the input value corresponding to the desired output value. 2) inlcude the measured value in your (...)
I am trying to connect a common mode output to a differential input in base band. I found a differential driver for example from AD: AD8131. The question is : Is it possible to do without an active device? Thanks