my op amp design specification(your opinion)

[dewabantura]

Hi fellow friends and professionals,

I have already finished designing a high performance (Low voltage, low power) op amp with the following specs;

- 0.18u CMOS technology
- 2V supply voltage
- 234.75u watt overall power dissipation
- 151.268 MHz Unity Gain Bandwidth

I hope to hear your opinion and comment about my op amp specifications. I am really honoured to have your opinion said here.


Thank you and good luck for your future undertakings!

 

[analog_prodigy]

Good, you did a great job.
But, still you can reduce the power dissipation upto 80 uW

 

[Sadegh.j]

hey

You did great, but just a point, I believe one can comment about your design if he knows the application of your op amp, may be it is good to increase the power a bit, but have a larger unity gain.

Well done!

 

[renwl]

no loads information, how can estimate it?

 

[dewabantura]

hi friends and fellow professionals,

Thanks for viewing my op amp specification. I will update my op amps' other specs such as voltage swing, settling time and slew rate.

Thanks again to analog_prodigy and sadigh for your comments. My op amp doesnt have any specific application. I am concentrating on having a low power, low voltage, high speed op amp.

Thanks also to renwl for your comment. Can you explain about loads information? i do not understands

Thanks again, and good luck for your future undertakings!!!

 

[starrinesss]

load information means your opamp output load, capacitor and resistor or others. So that to evaluate your spec

 

[analog_prodigy]

But how can you design a low power & high speed? when i targetted for low power of 80uW, i got a slew rate just 6V/uS. If u know any other specific technique please share it.

 

[paley]

you must add a output capacitor in your simulation entironment.

 

[starrinesss]

Slew rate depend on your output current , so an output buffer could be considered

 

[dewabantura]

Hi friends and fellow professionals

Thanks all for your comments and suggestion. I have simulated my op amp slew rate. Below are the netlist for my slew rate simulation;

Xopamp In1 In2 Vdd Vss Vout opamp

Cf Vout 0 20pF

RL1 Vout In2 5k
RL2 In2 0 5k

VEN In1 0 pulse 0 1 10n 5n 5n 500n 2u

.options list node post
.op
.tran 10n 5u
.print tran v(vout) v(In1)
.end

Using cosmoscope, I have measure a 89.476V/us of slew rate. The rise time is 224ns and fall time is 49.575ns.

By the way, i forgot to state my op amp gain. My op amp gain is 64dB.

Thanks again and good luck for your future undertakings!