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a question about input construction of OTA

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qwertyIC

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This is input construction of OTA. PIN is negative (change as out current), Once A drop to zero, OTA begin to work. My question: why Q1/2 collector is connected to Q3/Q4 collector. consider what? Q1/Q2 act as lever shift. they can connet gnd directly, I think. Thanks for your relply!
 

Hi,
Q1/Q2 increase the input impedance (Darlington configuration).
 

Thanks, but others effect?

Hi,
Q1/Q2 increase the input impedance (Darlington configuration).
 

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