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143 Threads found on edaboard.com: Opamp Pole
GBW of aux opamps has to be equal to dominant pole of main opamp. In other way You get zero (if GBW is lower) or additional pole if it is higher. It results with auxilliary amps dominant pole location equal to main opamp dominant pole divide by aux opamp gain.
Hi, Can any one suggest me to remove the poles in CMFB circuit loop in differential opamp. This poles are appeared due to the filter feedback network. The CMFB circuit has shown below, and Loop gain and phse shift. I noticed that SR did not change in the Filter due to instability of CMFB. 117712
which hall senser ic ,u used ?? vcc voltage ?? if u wana to use nly sense the position of magnet, On (LOW) with magnetic South pole and Off (HIGH) without magnetic field or with magnetic North pole, if you need inverted output, use a NPN Transistor like BC547 or FET or inverter chip like CMOS CD40106 or TTL 74LS04 or use an opamp and get (...)
Hi, I am designing four stage NGCC opamp in TSMC 180 nm process using Cadence Mixed signal design domain, keeping all mos have uniform length L = 360nm. I have designed whole circuitry in proper way so as; gm1 = 114?s & gmf1 = 113.87?s. ( gm1 = transconductance of PMOS of diffrential amplifier ) gm2 = 184?s & gmf2 = 183.5?s gm3 = 294?s & g
what is the benefit of using folded cascode opamp over telescopic opamp.
Hi, I designed an operational amplifier CMOS two stage. I want to simulate the PSRR. Vdd = 2.5 V and Vss = -2.5 V, are the voltages supply of the opamp. What configuration and values in the input should I choose for the simulation of the PSRR ? Regards, Joaquin
Specs; DC gain 60dB UGB 50MHz PM >60 VCC 2.5V I am working on this design and DC gain & UGB is already fulfilled the spec,but the PM is always around 30 deg. Because the sec pole is right at 63MHz and cannot be moved right(high freq). I know the sec pole coming from the folding point, but no matter I increase the current in the cascoded br
Hello, The opamp that gets used as an error amplifier in an SMPS has a limited gain bandwidth product. Will the opamp's limtiations mean there is a pole at about 50KHz in all SMPS's that use standard opamps for error amplifiers?
What you need is a power operational amplifier. Connect a PNP/NPN transistor "pole" after an opamp to get the required current. Details you can find among audio power amplifiers Or find another display that needs less current to operate.
Hi Analog experts, I'm seeing this material in this link page 8, there's this below description. I don't understand physically how it can be diode-connected. If it's diode-connected at a certain frequency, the drain and gate of M5 in page 3 should be in same potent
Hi FvM, could you give me more clear advise about what you are saying? The setup for simulation is no problem, I just inject an AC signal in the non-inverting input of opamp, and probe the frequency response of its output. It might be a problem if you don't care for DC bias. In the present application, you want to measure the loop g
I am designing a PMOS input folded cascode OTA, specs are VDD = 1.2 V, current limit = 1mA, Gain>=60dB, Output Swing = 1 V (differential), UGBW >= 800 MHz. V,CM (output) =0.6 V. Can anybody suggest how do I go about improving the UGBW from 400 MHz(present) to 800 MHz ? Please let me know if I missed something. Thanks
can we configure low pass and high pass filter as inverting configuration using opamp? why? why not? please help.. Of course, you can. For example using the multi-feeedback topology (MFB). Try to start an internet search.
Hi I wanna design an opamp (2 stage folded cascode) where can I find analysis of this opamp? I need to know poles,zeros,unity gain,... for designing? plz help me I wasnt able to find any book or paper.:cry::cry: tnx
Like any opamp, a comparator exhibits a bandwidth limitation characterized by its dominant pole, which in most cases is its output pole. Hence its "built in" 3db bandwidth is approximately 1/2πRC , R being its output impedance, C its load capacitance.
hi , I have used the verilog-A model of opamp in cadence ahdl library as shown in the file 82569. It models the dominant pole of the opamp and slewing limitation. following values were taken for the opamp parameters : open loop gain = 1000, unity gain frequency = 50 MHz shown here the schematic 82571[/ATT
The Gain * bandwidth of a opamp is constant if you increase the gain the BW /f3b will decrease .You can look into any book which deals with OTA and you will understand better .
Hi all, I designed a folded cascode amplifier,I want to get 1vp-p ((vin=sin(12x ))swing from diff out of opamp. shoulde first pole of folded cascode biger than 12x????????????
You have to get your terminology right first. Assume you start off with an ideal single-pole opamp with open loop DC gain of 1000, and open loop -3dB frequency of 1kHz. This gives you a gain bandwidth product of 1MHz. You take this opamp, configure it with unity beta and you get a closed loop DC gain of 1, and close
Hello, I have a bode plot of an inverting opamp (magnitude plot). I wish to add in a pole at 3KHz. I know that this makes it go down with an extra gradient of the -20dB from the 3KHz point, but how mathematically do i add in this pole?, -i.e. how do i mathematically adjust the values of the bode plot to add in this pole?