Monolithic Instrumentation Amplifiers

Monolithic Instrumentation Amplifiers

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Monolithic integration techniques allow a reduction of production costs for hybrid and modular circuits. For instrumentation ampliflers there are circuit alternatives to those in Figures 3.39 and 3.40 that reduce the redundancy present in them. Th...

Monolithic integration techniques allow a reduction of production costs for hybrid and modular circuits. For instrumentation ampliflers there are circuit alternatives to those in Figures 3.39 and 3.40 that reduce the redundancy present in them. This does not imply that these circuits are not available in monolithic form. The already mentioned INA 101 is in fact monolithic. Figure 3.41 shows a simplifled version of the internal circuit of model AD 520 from Analog Devices Inc. which was the flrst monolithic instrumentation.

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amplifier [10]. Actually it has been replaced by improved models, but its circuit allows us to recognize in a simple way the differences between mono- lithic units and the previous circuits.

When a differential voltage Ez - Er is applied to the input, collector currents in Q1 and Q2are unbalanced by (Ez - E)IRG. AmplifierAl detects that difference and gives an error voltage between the sense (S) and refer- ence (R) terminals. This error voltage unbalances collector currents in Q3 and Qa by (Vs - yd/Rs. Amplifier 42 detects this difference and adjusts current sources I and Ia in order to match collector currents in Q3 and Qq. At the same time A2 adjusts current sources 11 and 1z so that Ir - Iz: Iq - It. When this situation is achieved, the output voltage is (Ez - Er)Rs/RG. Thus, contrary to instrumentation amplifiers based on two or three op amps, in these monolithic amplifiers the CMRR does not depend on resistor matching but on the matching of current sources.

In addition to those already mentioned, models AMP-01 from Precision Monolithics Inc., AD 524 and AD 624 from Analog Devices Inc., and LM 363 from National Semiconductor Corp. are also monolithic. The time and thermal drifts of their offset voltages and currents, and their noise are even better than those of older hybrid units or modules.

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