An op-amp with the offset and temperature drift specifications given in Exercise 2.10 is to be used as a follower with a feedback resistor of 10 kO and a resistor of 1 kO connected between the inverting input terminal and earth. The circuit is supplied by a signal source of internal resistance 100 kO. 

Find: a

(a) the output offset error with no offset balance; 

(b) the smallest input signal that can be amplified with no more than 1 percent error if initial offsets are balanced and the temperature changes by 10°C (see Section 2.9.1).