3\" (17 pts) the greatest precision possible. What is the key parameter +hat you

Question

3" (17 pts) the greatest precision possible. What is the key parameter +hat you are looking for? What is the best opamp? Now you want a precision opamp with a small Vos to compare two 100uV to i. maximum gain ll. gain-bandwidth product m i, slew rate - iv, noise V. power supply limits vi. current output vii. max voltage offset at 25°C vili. max input current at 25°C ix. CMRR x. Worst case Saturation levels at 25°C Xi PSRR xii. Required external components " xii. Operating temperature range xiv. Package-does it have pins?- xv. Input Resistance m xvi. Output Resistance

Explanation / Answer

We want precision OpAmp with a small Vos to compare two 100 micro Volts to greatest possible precision.

This is possible if we have low value of max voltage offset at 25 Deg.C

As unwanted voltage Voo added due to offset voltage Vio is given by

Voo = ( 1 + Rf/R1 )Vio                      ( Rf = feedback resistor , R1 = input resistor of OpAmp )

This voltage will make it difficult to compare 100 micro volts properly.

Hence max voltage offset at 25 Deg.C is a key paremeter for precision of comparing 100 micro volt sources.

Output offset voltage due to offset voltage is potentially a greater problem than the output offset voltage due to max input current at 25 deg.c

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