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Because I like the structure and nice accuracy can be achieved (The Op-amp is auto zero and has very low offset voltage). Thanks for the tip, I will investigate the performance of sensing with a differential amplifier.
Ivan
Hi.
The circuit is attached below. It is a common current sense amplifier architecture.
For example if a want my output range to be 0-3.3V (the voltage across R2), the circuit will stop working for input voltages (I mean the rail voltage on which I'm measuring current) lower than 3.5V since...
Hi guys.
I'm trying to design a remote sense input to mitigate voltage drop on cable resistance. Since I must have resistance on high frequency to introduce damping factor and avoid ringing, the loop should reduce the impedance only on low frequencies (up to 1kHz).
It is strange I cannot find...
Hi.
I'm designing a circuit in a 130nm technology. Minimum L=120nm, a minimum W=160nm.
For example, if a channel length of some transistor is set to 1um, what is the resolution in which I can change the length so that this change can still be produced in a given technology?
I presume the...
You just multiply it with your gain. That's why offset voltage is a huge problem when measuring low DC. You need a high gain and you cannot block the DC with a cap since it's your voltage + offset.
For the shunt resistor you can easily use 0.1%.
Hi.
Yes, that is a real problem. Measuring very small DC (or low frequency) voltages is very difficult, as you said, because it requires a very precise OP-AMP.
The solution to your problem is to use an auto-zero or chopper op-amp. Google those terms. Auto-zero OP-AMP's can have a offset voltage...
You have connected a very large capacitor directly to the inverting input. That means you are adding a phase shift of 90 deg !! You cannot do that! The circuit would oscillate. If you add the resistor like the nice man said, you are creating a zero to compensate for the pole, and the system...
Hi.
Think about this. If all the numbers were real, how would you describe phase shift in electrical circuits? With complex numbers because they have magnitude and phase!
E.q. when you connect a voltage to a capacitor, the current will not be V/real(Z), it will be V/Z where Z is a complex...
Quotation from https://en.wikipedia.org/wiki/Ferrite_bead :
Ferrite beads employ the mechanism of high dissipation of high frequency currents in a ferrite to build high frequency noise suppression devices.
Hi.
I'm using coaxial cables to transfer power from the power supply to the device (IC under test). Since there is danger from resonance peaks in the supply's output impedance, I'm trying to model the whole system and find the solution (in form of additional damping).
For e.q, my coax is 50...
Re: Transistors
Hi wolfric. The most important thing to learn is the PN junction. By studying it you will be able to understand more about what happens to electrons & holes. Forget about transistors for now.
I will answer your question shortly. For example, in a NPN bipolar transistor the...
OK, now you can easily calculate the required gm. GBW=gm/(2*pi*CL). From this equation you have gm. Now, gm=2*Ids/(Vgs-Vt). You can pick Vgs-Vt for eq 0.2V. From it you get your Ids. Next you have to include Av0 gain into the equation to determine the size of transistors.
It's not so difficult...
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