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Why do we use replica bias ?

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pansoo

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replica bias

:|...
 

replica bias circuit

simple question vs simple answer :cry:
 

replica bias vco

replica bias circuit is always been uesd at sensitive analog circuit, like VCO.
Because it can meet good match properity for bias circuit and circuit been biased.
 
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    grules

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replica-biased circuit

Replica bias is used as bias for delayelements for VCO. It provide good stability over PVT such that freq. will not vary over PVT.
 

replica bias in vco

I want to know why we use op amplifier. We can bias directly from some biasing circuit to vco. But why we use op amp between baiasing ckt and vco.

um. I think input impedance of op amp is infinity. Thus if we use op amp between biasing ckt and vco, the vco will not affect to biasing circuit. But if we directly bias vco then it's finite input impedance will affect to the biasing circuit. Is it right :?:
 

replica biasing circuit

Replicate biasing circuit is a simple straightforward method to ensure that bias current in the active circuit to be biased is exact the refernce current or a fixed ratio to them.

The design principle is that the active part of the circuit is duplicated and driven by a reference current. The voltages of the biased devices in the replicate circuit are then used to bias the active stages. So the bias current in the active stages mathc very close the reference current.
 
how to find reference for replica bias in vco

Hi can anybody give characterstics of nbias and pbias with supply changes(for replica bias circuit only
 

hi
can replica bias can operate properly for high frequency vco like 5Ghz?
 

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