Help me choose appropriate op amp for a task

Status
Not open for further replies.
N

naspek

Member level 1
Joined
Feb 17, 2010
Messages
37
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,286
Activity points
1,546
A voltage signal generated by a sensor conditioning circuit varies from -0.5V to +0.5V . The signal from the sensor is to be connected to the analog to digital converter which only accepts positive voltage. Design an op-amp circuit to amplify the signal 5 times and shift the signal to the positive range. The output signal after amplification and shifting should fluctuate between 0 V to 5 V. Choose the resistor value so that the dc current does not exceed 100uA

can anyone suggest which type of op amp should be used to solve this question?
 

Re: Problem with op amp

At first, I wouldn't think about the opamp type. Instead, the first task is to design the amplifier circuit. Just try it.
 

Re: Problem with op amp

Two ways to do this:

1:
Amplify signal 5 times (respect to gnd) and use an adder and add by 2,5V.

2:
Add input signal with 1/2V, and then amplify it 5 times. Same result.

3:
Use an non-inverting opamp amplifier and calculate the gain and local gnd voltage. This way, you'll save a lot of components. If you want the numbers, just tell
 

Re: Problem with op amp

Use an non-inverting opamp amplifier and calculate the gain and local gnd voltage. This way, you'll save a lot of components. If you want the numbers, just tell


is this non inverting level shifter?
 

Problem with op amp

Prototyp_V1.0
 

Re: Problem with op amp

naspek said:
Prototyp_V1.0
Click to expand...

Use the formulas below to calculate gain and voltage at GND (not 0 volts).

Then use basic formulas to find R1 and R2. You need to choose one value first and then calculate the other. Start t.ex witht R1 = 10kΩ.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…