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# Looking for opamp integrator circuit diagram

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#### RollingEEE

##### Full Member level 3
I want a circuit diagram of an Opamp integrator that will have an input signal of rectifies square waves (15 V peak value, 2kHz frequency, and 0-50% duty cycle)

#### tanzil_dhk

Re: Opamp Integrator

here is a netlist for opamp integretor...u can change accordongly

* Schematics Netlist *

R_R1 $N_0002$N_0001 1k
C_C1 $N_0001$N_0003 10u
E_U2 $N_0003 0 VALUE {LIMIT(V(0,$N_0001)*1E6,-15V,+15V)}
V_V4 \$N_0002 0 DC 0 AC 10
+SIN 1 1 10 0 0 0

#### RollingEEE

##### Full Member level 3
Re: Opamp Integrator

I know the theoretical circuits. I want a practical implementation

#### tanzil_dhk

Re: Opamp Integrator

well,
implementation in what???? not in pspice???

#### Kral

Re: Opamp Integrator

RollingEEE,
A true integrator output will ramp up at a constant rate while the square wave input input is non-zero. The output will remain constant while the input is zero. It will then ramp up (starting where it left off) at the constant rate when the input is again non-zero, This process will continue until the output reaches saturation. Is this what you want?
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A true integrator is very difficult to implement because both input offset voltage and input bias current will cause the output to drift, even with zero input.
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You can approximate an integrator with a low pass filter whose time constant is very long compared to the period of the input. This will mitigate the drift problem.
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Let the integrator characteristic time equal Tau = RC, wher R is the input resistor, and C is the feedback resistor. Then the output ramp rate wil equal Vin/(RC).

waynesuvol

Points: 2

### waynesuvol

Points: 2

#### Ashish.chip

##### Newbie level 6
Opamp Integrator

give your mail id....i'll mail u the circuit diagram.

#### RollingEEE

##### Full Member level 3
Re: Opamp Integrator

thanks for replying all. I just want the average value of a PWM square wave. Lets just say that the input will be a PWM wave and the output will be proportional to it's DC or average value. The output should be DC, with or without some small ripple.

##### Full Member level 6
Re: Opamp Integrator