OPA2197: Reference design

Wesley Huang

Expert 1030 points

Part Number: OPA2197

Hi team，

Could you please provide a non-inverting amplifier reference design via OPA2197 ? the requirement is shown below:

1. Gain: 10V/V

2. it is used to enlarge the signal of 1VPP whose frequency is 1Mhz.

Best Regards

Zhihong Huang

over 3 years ago

0 kai klaas69 over 3 years ago

Guru 140200 points

Hi Wesley,

for a 5Vp sine signal of 1MHz a slew rate of 5V * 2 * Pi * 1MHz = 31.4V/µs would be required which is beyond the capacity of OPA2197 (20V/µs).

Kai

0 Wesley Huang over 3 years ago in reply to kai klaas69

Expert 1030 points

Hi Kai,

Thanks for your reply. could you please recommend anther device and reference design for me?

Best Regards

Zhihong Huang

0 kai klaas69 over 3 years ago in reply to Wesley Huang

Guru 140200 points

Hi Wesley,

you could do it this way:

wesley_lmv116.TSC

Kai

0 Wesley Huang over 3 years ago in reply to kai klaas69

Expert 1030 points

Hi Kai,

Thanks for your reply.

If i want to use achieve the 10vpp output via 3~4 stage amplifier and other condition is the same as i shown aboved so that i could used the lower cost amplifier.

Do you have any reference design and GPN?

Best Regards

Zhihong Huang

0 Raymond Zhang1 over 3 years ago in reply to Wesley Huang

TI__Mastermind 48076 points

Hi Huang Zhihong ,

I was not sure what you are asking for? What is GPN?

The cascade op amp can increase BW by the following relationship, assume each stage is identical. BW_Final = BW_each*sqrt(sqrt(1/n)-1), where n is the number of stages.

Best,

Raymond

0 kai klaas69 over 3 years ago in reply to Wesley Huang

Guru 140200 points

Hi Wesley,

if you find a cheaper OPAmp with a slew rate > 32V/µs and a bandwidth > 32MHz... :-)

Kai

0 Wesley Huang over 3 years ago in reply to kai klaas69

Expert 1030 points

Hi Kai,

I solved my problem.

Thanks for your reply.

Best Regards

Zhihong Huang

0 Wesley Huang over 3 years ago in reply to Raymond Zhang1

Expert 1030 points

Hi Raymond,

I solved my problem.

Thanks for your reply.

Best Regards

Zhihong Huang

0 kai klaas69 over 3 years ago in reply to Wesley Huang

Guru 140200 points

You are welcome, Huang Zhihong :-)

Kai

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OPA2197: Reference design