OPA656: About 'Acl (MHz) 500' on the product page

diverger

Expert 1275 points

Part Number: OPA656

Hi,

On the OPA656's page, it states:

GBW (typ) (MHz) 230

BW at Acl (MHz) 500

Why BW > GBW? How 500MHz derived here?

Thanks.

即刻收集

+1 Anant Sinha over 2 years ago

Hello,

The GBW of 230Mhz is valid for higher gain G>10.

For lower gain setting the Bandwidth will be higher because of Gain peaking.

BW at Acl meaning -3dB bandwidth at minimum stable positive gain which is for G=1 in this device.

See the below graph (Figure 1 of Datasheet)

Regards

Anant

0 diverger over 2 years ago in reply to Anant Sinha

Expert 1275 points

Yes, I missed that GBW may be specified at Acl other than 1.

Thanks.

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