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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC1050 датащи(PDF) 13 Page - Linear Technology |
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LTC1050 датащи(HTML) 13 Page - Linear Technology |
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13 / 28 page  LTC6258/LTC6259/LTC6260 6258960fa 13 For more information www.linear.com/LTC6258 OPERATION The LTC6258 family input signal range extends beyond the negative and positive power supplies. Figure 1 depicts a Simplified Schematic of the amplifier. The input stage is comprised of two differential amplifiers, a PNP stage Q1/ Q2 and NPN stage Q3/Q4 that are active over different ranges of common mode input voltage. The PNP stage is active between the negative power supply to approxi- mately 1V below the positive supply. As the input voltage approaches the positive supply, transistor Q5 will steer the tail current I1 to the current mirror Q6/Q7, activating the NPN differential pair and the PNP pair becomes inactive for the remaining input common mode range. Also for the input stage, devices Q17, Q18 and Q19 act to cancel the bias current of the PNP input pair. When Q1/Q2 is active, the current in Q16 is controlled to be the same as the current Q1/Q2. Thus, the base current of Q16 is normally equal to the base current of the input devices of Q1/Q2. Similar circuitry (not shown) is used to cancel the base current of Q3/Q4. The buffer and output bias stage uses a special compensation technique to take full advantage of the process technology to drive high capacitive loads. The common emitter topology of Q14/Q15 enables the output to swing from rail to rail. |
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