Mihai,
My mistake; I apologise, I was thinking of the highlighted capacitor between the LTP collectors!!'
These diodes are used to thermally compensate the BE junctions of TS15 and TS15 since both are fed from a current source and only one of the voltage reference diodes compensates the BE voltage of the CCS.
To be honest, I don't believe they are really necessary, particularly if you replaced the two diodes of the CCS with a green LED, which has almost the same tempco as the be junction of the CCS transistor.
Again, I'm sorry Mihai, I mistook the cap for your question!
Cheers,
Hugh
My mistake; I apologise, I was thinking of the highlighted capacitor between the LTP collectors!!'
These diodes are used to thermally compensate the BE junctions of TS15 and TS15 since both are fed from a current source and only one of the voltage reference diodes compensates the BE voltage of the CCS.
To be honest, I don't believe they are really necessary, particularly if you replaced the two diodes of the CCS with a green LED, which has almost the same tempco as the be junction of the CCS transistor.
Again, I'm sorry Mihai, I mistook the cap for your question!
Cheers,
Hugh
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