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16 Threads found on Opamp Power Dissipation
A voltage regulator uses an opamp with a reference voltage driving a series pass transistor. But your Vdd is so low that I do not know of an opamp and series pass device that will work.
Hi, I am designing an 10 Bit 200 MSPS Pipeline ADC in TSMC 65nm process. Just finished the design of first stage opamp. It uses the "Folded Cascode Gain Boosted opamp" architecture. The supply voltage is 3.3V. The total current drawn from the supply is around 90mA. Therefore, the first stage opamp itself dissipating around 300mW (3.3 *
Hi, Can someone suggest opamps that can provide 100mA continuously at 5 volt or more? Slew rate is not a concern.
Hi, or First of all, I apologize for riposting this. Initially I posted under different category, I'm not sure how to delete or move the old post. <- This is my original post. Now my problem: I am trying to make a circuit that would convert a pwm signal (0-5v) to a 12v to -12v analog signal. Schema
Hello All, I have to design a CMOS opamp at 135 nm Technology......... I have the circuit diagrams and parameters at 180 nm . I have to simulate it on TANNER EDA. I have model file for 135nm : * MOSIS WAFER ACCEPTANCE TESTS *
I have a 6v 1.3A battery and I want an opamp that works with it. I want the opamp tp draw as much current as it can from the battery. My question is, which part of an opamp datasheet should i be looking at in order to meet my needs. I think i understand the the voltage part but i don't understand how you can tell how much current will be (...)
Dear All, I need to design an output stage (third stage) for a two-stage compensated opamp. I have gone through some related papers and text. After reading them, I have built-up some interpretations: 1. The main design specifications whilst designing the o/p stage are a) output swing, b) power dissipation (or efficiency), c) linearity (or
Hi, I would need some help in a power dissipation issue. I have a power opamp that works in a non-inverting topology. Here some data: - Single Supply = 12V - Output voltage = 6+3*sin(wt) V - Output current = 100*sin(wt + alfa) mA where: w = angular frequency t = time alfa = angle between current and (...)
Suppose I am using an opamp as an amplifier with +12V as pos and _12 as neg supply. Consider supply current as 3mA at no load.How will i calculate the power dissipation. Next is the opamp configuration as precision rectifier with same supply and current. Will there be any change in power (...)
In a conventional two stage opamp operating in weak inversion for ultra low power dissipation, does all transistors operate in weak inversion OR only differential pair transistor and tail transistor operate in weak inversion. Plz, Need help! Thanking You.
The gain, BW and o/p swing u refer is for opamp or integrator?? You need to know the specifications such as the power supply voltage rail, power dissipation for determine the opamp structure. :D
"PMOS body connected to drain..." why not connected to power or source? Hi can anybody share to me a CMOS opamp net list roughly meeting the following specifications. DC gain >75dB Unity-gain frequency > 150MHz Phase margin at unity-gain frequency > 65o Slew rate > 50V/μsec PMOS body connected to drain and
Put a zero-volt voltage source in series with all the op-amp stages and then measure the currents through them. This will give you power per stage - by V*I (of course) and is more useful, than just finding the total power for the opamp.
I have designed an two stage opamp with following performance supply: 1.8V open loop gain: 87.1dB unity gain frequency :35.3MHz Phase Margin: 64 Slew Rate:11V/us CMRR:84.6dB PSRR-:65.5dB PSRR+:95.4dB Is there any other test i have missed? By the way, the slew rate is quite low, how can i improved it?
Due the application of dc feedback, I think a typical differential stage opamp would serve the purpose. If the frequency of application is high, a cascode stage differential opamp would serve the purpose Rgds
It all depend on the specification that you are looking for. Most of the time the process we use to design a opamp will be the crucial point as it will limit the design parameters and the rest as others mentioned in the post.