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VCO IEEE paper revue - What does he mean by ft

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AdvaRes

AdvaRes

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VCO IEEE paper revue

Hi members,

I'm reading this IEEE paper:

A Fully Integrated VCO at 2 GHz



In the Abstract the autor says that

"A fully integrated voltage-controlled oscillator at a
frequency of 2 GHz with low phase noise has been implemented
in a standard bipolar process with a ft of 25 GHz"

What does he means by ft ?
 

Re: VCO IEEE paper revue

hi,

its "transit frequency"

you can find more details abt this in literature|board| google

THanks,
 

VCO IEEE paper revue

I did it. Unfortunately, I got always papers on VCO design.
Could someone define the transit frequency briefly ?
 

VCO IEEE paper revue

It's the frequency, where the intrinsic gain curve of a device (means: isolated device, no load, voltage gain-vs-frequency-decay = -20dB/decade) hits the 0db-line (vu=1). At this transit frequency (fT) the voltage gain by definition is =1, but the power gain may still be >1, so it is possible to use it as an oscillator or even as an (power) amplifier still beyond this fT.
It's also a clue that you can achieve a voltage gain of 20dB @ fT/10 with this device and an appropriate circuit.
 

    AdvaRes

    AdvaRes

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