drkjreddy
Newbie level 5
Hai,
I am using opamp LF356 as high gain amplifier with gain upto 1000 with +16 and -16 volts as powersupply to the IC.
I want to amplify the input DC transient of voltage 10mv to 100mv maximum. When the gain is changed from 1 to 1000, I found the signal in CRO is total distorted. At Gain of 1 to 100, when the signal view in CRO of 5mv/div or 10mV/dvision , it appears the signal is of fair quality. But if I observed the same signal at gain 500 or 1000, the same signal appears in CRO (in 1v/Division range appears as floating one (may be more noise) . Though I have used good power supply and filtercapacitors at the powersupply terminals. My question is how can I improve the signal quality at high gain without degrading the slewrate of the opamp. In my case the slewrate of 1micro second/volt is recommended. Is there need to change the opamp of different type or any suggestion.
Also suggest me the precautions at PCB level.
With Thanks
drkjreddy
I am using opamp LF356 as high gain amplifier with gain upto 1000 with +16 and -16 volts as powersupply to the IC.
I want to amplify the input DC transient of voltage 10mv to 100mv maximum. When the gain is changed from 1 to 1000, I found the signal in CRO is total distorted. At Gain of 1 to 100, when the signal view in CRO of 5mv/div or 10mV/dvision , it appears the signal is of fair quality. But if I observed the same signal at gain 500 or 1000, the same signal appears in CRO (in 1v/Division range appears as floating one (may be more noise) . Though I have used good power supply and filtercapacitors at the powersupply terminals. My question is how can I improve the signal quality at high gain without degrading the slewrate of the opamp. In my case the slewrate of 1micro second/volt is recommended. Is there need to change the opamp of different type or any suggestion.
Also suggest me the precautions at PCB level.
With Thanks
drkjreddy