(a) An instrumentation amplifier shown in Figure 1 is an anplifier of low-level signals used in process control or measurement applications and conmercially available in single-package units:   (i) Show that Vo​=R3/​R2​​(1+2R1/Rg​​)(v2​−v1​).   (ii) Assume R1​=50kohms and R2​=R3​. If Rg​ is a tunable resistor with resistance ranging from 1000 ohms to 10k ohms, what is the range of variable gain?   (iii) Assume R1​=10k ohms and R2​=R3​,∣v2​−v1​∣<=120mV and Vcc​=12 V. In order to keep the op-amp circuit work in linear region, what is the minimum value of Rg ?   (iv) State TWO characteristics of this op-amp circuit.

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(a) An instrumentation amplifier shown in Figure 1 is an anplifier of low-level signals used in process control or measurement applications and conmercially available in single-package units:
  (i) Show that Vo​=R3/​R2​​(1+2R1/Rg​​)(v2​−v1​).
  (ii) Assume R1​=50kohms and R2​=R3​. If Rg​ is a tunable resistor with resistance ranging from 1000 ohms to 10k ohms, what is the range of variable gain?
  (iii) Assume R1​=10k ohms and R2​=R3​,∣v2​−v1​∣<=120mV and Vcc​=12 V. In order to keep the op-amp circuit work in linear region, what is the minimum value of Rg ?
  (iv) State TWO characteristics of this op-amp circuit. 

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