1. Parameters of OP-AMP M.S.P.V.L Polytechnic College, Pavoorchatram. www.ustudy.in

2. Circuit Symbols of OP-AMP www.ustudy.in

3. Parameters of OP-AMP  Input offset voltage  Input offset current  Input BIAS current  Large signal voltage gain  Output voltage swing  Differential input resistance Ri  Input capacitance Ci  Common mode rejection ratio  Supply voltage rejection ratio  Slew rate  Gain bandwidth product www.ustudy.in

4. Input offset voltage  Input offset voltage is the voltage that must be applied between the two input terminals of an op-amp to null the output.  Typical value of 741 IC is 6mV dc. www.ustudy.in

5. Input offset voltage www.ustudy.in

6. Input offset current  The algebraic difference between the current in the inverting and non inverting terminal is known as the input offset current Iio.  As the matching between two terminals increases,the difference between IB1 and IB2 become smaller.  Typical value for 741 IC is 200mA(max). www.ustudy.in

7. Input offset current www.ustudy.in

8. Input BIAS current  I B is the average current flows in the Inverting and Non-Inverting terminal of OP-AMP. IB = (IB1 + IB2 )/2  Typical value for 741 is 500mA www.ustudy.in

9. Input BIAS current www.ustudy.in

10. Large Signal voltage Gain  It is the ratio of the output voltage and the differential input voltage. A= Output voltage/Differential input = Vo/Vid  Typical value for 741 IC is 200,000. www.ustudy.in

11. Large Signal voltage Gain www.ustudy.in

12. Output Voltage Swing  This parameter indicates the values of positive and negative saturation voltage of the op- amp.  For 741IC,it is +13 and -13V. www.ustudy.in

13. Output Voltage Swing www.ustudy.in

14. Differential Input Resistance Ri  Differential input resistance Ri is the equivalent resistance that can be measured at either the inverting or non-inverting input terminals with the other terminal connected to ground.  Typical value for 741 IC is 2 mega ohm. www.ustudy.in

15. Differential Input Resistance Ri www.ustudy.in

16. Input Capacitance Ci  Input capacitance is the equivalent capacitance that can be measured at either the inverting or non-inverting input terminal with the other terminal connected to ground.  Typical value for a 741 IC is 1.4 pF. www.ustudy.in

17. Input Capacitance Ci www.ustudy.in

18. Common Mode Rejection Ratio  When the same voltage is applied to both the input terminals the voltage is called a common mode voltage Vcm and the op- amp is said to be operating in the common mode configuration  CMRR is defined as the ratio of the differential voltage gain to common mode gain. CMRR = Ad/Acm www.ustudy.in

19. Common Mode Rejection Ratio www.ustudy.in

20. Supply Voltage Rejection Ratio  The change in an op-amps input offset voltage Vio caused by variations in the supply voltage is called the SVRR.  It is expressed in microvolts per volt or in decibels. SR= ΔVio/ΔV  Typical value for a 741IC is 150μV/V www.ustudy.in

21. Supply Voltage Rejection Ratio www.ustudy.in

22. Slew Rate  Slew rate is defined as the maximum rate of change of output voltage per unit of time and is expressed as volt per micro second. SR=(|dVo|/|ds|)max ie V\μs www.ustudy.in

23. Slew Rate www.ustudy.in

24. Gain Bandwidth Product  The gain bandwidth product(GB) is the bandwidth of the op- amp when the voltage gain is 1.  Typical value for 741 IC is 1MHz. www.ustudy.in

25. Gain Bandwidth Product www.ustudy.in

26. The End …… Thank You …… www.ustudy.in