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LT1496IS Datasheet(PDF) 11 Page - Linear Technology |
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LT1496IS Datasheet(HTML) 11 Page - Linear Technology |
11 / 16 page 11 LT1494/LT1495/LT1496 APPLICATIONS INFORMATION Figure 3. Simplified Schematic The input stage is formed by two diff amps Q1-Q2 and Q3- Q6. For signals with a common mode voltage between VEE and (VCC – 0.8V), Q1 and Q2 are active. When the input common mode exceeds (VCC – 0.8V), Q7 turns on, diverting the current from diff amp Q1-Q2 to current mirror Q8-Q9. The current from Q8 biases on the other diff amp consisting of PNP’s Q5-Q6 and NPN’s Q3-Q4. Though Q5-Q6 are driven from the emitters rather than the base, the basic diff amp action is the same. When the common mode voltage is between (VCC – 0.8V) and VCC, devices Q3 and Q4 act as followers, forming a buffer between the amplifier inputs and the emitters of the Q5-Q6. If the common mode voltage is taken above VCC, Schottky diodes D1 and D2 reverse bias and devices Q3 and Q4 then act as diodes. The diff amp formed by Q5-Q6 operates normally, however, the input bias current increases to the emitter current of Q5-Q6, which is typically 180nA. The graph, Input Bias Current vs Common Mode Voltage found in the Typical Performance Characteristics section, shows these transitions at three temperatures. The collector currents of the two-input pairs are combined in the second stage consisting of Q11 to Q16, which furnishes most of the voltage gain. Capacitor C1 sets the amplifier bandwidth. The output stage is configured for maximum swing by the use of common emitter output devices Q21 and Q22. Diodes D4 to D6 and current source Q15 set the output quiescent current. + 1495 F03 0.5 Q6 Q4 Q16 Q17 (V +) – 0.8V Q19 Q18 Q22 C1 D1 D2 V+ D3 Q3 Q11 Q2 Q7 IN – IN+ Q10 Q13 Q20 Q21 OUT Q12 Q14 Q15 Q5 0.5 0.5 0.5 Q8 R1 R2 I2 + I1 D6 D5 D4 D7 Q9 Q1 |
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