Why is a 10k resistor needed in a Vbe temp compensated circuit?

[brainbaby]

The following circuit is a Vbe temp compensated circuit
Query : what exactly the use of the 10k resistor required to connect the bases of two transistors...we can also have a direct coupling to connect the bases of both transistors...what exactly the difference it could make by adding the coupling resistor??

sorry if I am being too vague..

 

[Svein]

what exactly the use of the 10k resistor required to connect the bases of two transistors

There are several 10k resistors in the schematic. The resistor from the collector of Q1 to the base of Q2 sets the input impedance for the signal input. The resistor from the collector of Q1 to the base of Q1 is a feedback resistor that tries to keep the base of Q1 at the same potential as the base of Q2.

 

[Jony130]

Try read this
https://www.physicsforums.com/threads/matched-biasing-transistor.586992/

 

[brainbaby]

Try read this
https://www.physicsforums.com/threads/matched-biasing-transistor.586992/

Great explanation in post #12 of your mentioned thread...
Ok here it think it..If we change the values of both base resistors..it would result in unequal Vbe for both transistors ..which would further vary both transitor's Vce resulting in difference in collector current of both transistor ...hence a kind of unequal compensation ...
am i right?