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In the circuit given in the figure, if both transistor Q1 and Q2 are identical, then output voltage at T = 300 K is
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2 log10 
υ2 R1 
υ1 R2 -
log10 υ2 R1 υ1 R2 -
2.303 log10 υ2 R1 υ1 R2 -
4.605 log10 υ2 R1 υ1 R2
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Correct Option: B
| υ0 = | (υ01 - υ02) | |
| 20 |
| υ01 = -υBE1 - Vt ln | | | ||
| is |
| υ02 = -υBE2 - Vt ln | | | ||
| is |
| υ01 - υ02 = - Vt ln | | | = Vt ln | | | ||
| ic2 | ic1 |
| ic1 = | , ic2 = | ||
| R1 | R2 |
| υ01 - υ02 = Vt ln | | | , Vt = 0.0259 V | ||
| R2 | υ1 |
| υ0 = | (υ01 - υ02) | |
| 20 |
| = | (0.0259) ln | | | = 0.4329 ln | | | |||||
| 20 | υ1 | R2 | υ1 | R2 |
| = 0.4329 (2.3026) l0g10 | | | = l0g10 | | | ||||
| υ1 | R2 | υ1 | R2 |
