Part Number: OP27
comparing the internal schematic of the TIs OP27 shown in the data sheet with the OP27 of Analog Design one can see that the TIs OP27 Amplifier is depicted with a pure NPN bipolar transistor output stage where the ADs shows a complementary design in its data sheet. This difference would yield a voltage amplification factor higher than 1 (how much ?) and a signal inversion at the output pin with the TIs design..
A higher voltage amplification factor of the output driver stage would yield smaller voltages and voltage stress over the internal frequency compensation MOS-capacitors, which can be favorable.
Sincerely, Christian Daniel
In reply to Christian Yots:
Many thanks, all NPN output stage convinces me ! This means there must be an inversion inside the output stage wherefor the connections of the bases of Q21 and Q22 must be exchanged. In the schematic in the datasheet both transistors Q21 and Q22 are connected to the same collector of the input transistors - correct ?
Q3 shows an inverted NPN - intention ?
Does the minor internal changes of the OP27 have any (positive) effects on the Singe Event Gate Rupture (SEGR) hardness of the internal feedback MOS-capacitors ?
Greetings, Christian Daniel
In reply to Christian Daniel:
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