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Calculate the value of reference current and input resistor for current mirror with IC=1.2μA & VCC=12v. Assume β=50.

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in Linear Integrated Circuits by (37.1k points)
Calculate the value of reference current and input resistor for current mirror with IC=1.2μA & VCC=12v. Assume β=50.

(a) 1.248mA, 9kΩ

(b) 1.248mA, 9.6kΩ

(c) 1.248mA, 9.2kΩ

(d) 1.2mA, 9.6kΩ

The question was posed to me in final exam.

The above asked question is from Operational Amplifier Internal Circuit in division Operational Amplifier of Linear Integrated Circuits

1 Answer

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by (39.8k points)
Right option is (a) 1.248mA, 9kΩ

Paint a vivid picture of understanding with: We know that collector current, IC=β/(β+2)×Iref,

⇒ Iref=(β+2)/β×IC= (50+2)/50× 1.2μA = 1.248mA

⇒ Iref=(VCC-VBE)/R1

⇒ R1=(12v-07v)/1.248mA = 9.05kΩ.

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