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The working theory behind the voltage control circuit in this copitts common base VCO

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silver_sparrow

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Hi :)

Can any one tell me the working theory behind the voltage control
circuit in this copitts common base vco[attached jpg].

The voltage control ckt is in the centre of the figure. So plz explain
the following:

*purpose of resistor[1000ohm] from between transistors. Center and left transistor
*why we use a current source/mirror to pull the center transistor
*the capacitor at the volt control port: between the center transistor
and current mirror.

Also, this schematic is in @DS, but if I were to simulate it in C@dence
what ports would I need and were would I stick them?

thnx
Sparrow
 

VSWR

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vco theory

The details in the jpg-file is not readable. Can you provide the ADS project files instead?
 

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