Please order our ICs by their full names. Text: ORDERING INFORMATION New JRC ICs are named by New JRC Naming Standard. 622 Î D 50 MI C R O- I N C HE S TITLE: h t t p : / / c o m V E R T IC A L STYLE 60 S E R IE S, JRC RGC JRC. This topology is generally the best choice for an operational amplifier, it provides high input impedance, good voltage gain, common noise rejection as well as extra inputs for a summing feedback.The circuit nature is to amplify the difference of its input signals Vin+ and Vin-, providing cancellation to all even distortion, making the amp immune to fluctuations of the supply voltage.IC JRC 0820 Datasheets Context Search Catalog Datasheet
The current mirror Q 4 and Q 5 in the collector of Q 2 and Q 3 is the active load of the LTP. This stage highlighted in red color is formed by Q 1, Q 2, Q 3, Q 4, Q 5, R 1, R 2, R 3, and C 1: 1.2.1 JRC4558 Long Tailed Pair Differential Amplifier.The Long Tail Pair phase inverter or Schmit is formed by a pair of identical and matched PNP transistors in common emitter configuration (Q 2 and Q 3).
Q 1 is a plain current PNP constant current source.1.2 JRC4558 Input Stage:The input stage is formed by a Long Tailed Pair (LTP) differential amplifier with a current mirror. Q 13 and Q 7 are configured as a classic current mirror, meaning that the current through Q 13 (I 13) will be mirrored in Q 7, making I 13 = I 7. The circuit operates as a constant current source:The external current mirror load of this current source is connected to the collector so that almost the same current flows through it and the emitter resistor.
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