TRF372017 Kv

Daniel Gunyan

Other Parts Discussed in Thread: TRF372017

What is the Kv for the TRF372017? The help in the filter tool says 45 MHz/V. Will this value work for the full range of 2400 MHz to 4800 MHz VCO frequency?

over 12 years ago

0 Pete Hanish over 12 years ago

TI__Expert 3300 points

45 MHz/V is a good mean value of KVCO to use for loop filter design on the TRF372017.

KVCO does vary some across the wideband VCO range, but this is a secondary factor. A loop filter designed with 45 MHz/V will yield a stabilizing filter.

0 Jussi Saily over 11 years ago in reply to Pete Hanish

Prodigy 30 points

Is this really true?! One would expect a much larger Kvco value like 800 MHz/V because the VCO sweeps over 2400 MHz range with 3 volts? I'm too having problems in designing a loop filter for a 4100 MHz output signal with TI Loop filter calculator. Could you provide example loop filter values with, say 100 kHz or minimum phase noise BW?

It would be beneficial for TI to include the Kvco value in the chip datasheets like every other company does.

0 Jussi Saily over 11 years ago in reply to Jussi Saily

Prodigy 30 points

I forgot to add that I'm using a 10 MHz reference with R=2.

0 Frankly Fu over 11 years ago in reply to Jussi Saily

TI__Prodigy 140 points

Yes, it's true, 45 MHz/V is a good mean value of KVCO. There is SCA(switch capacitance array) inside, plus that, this chip(TRF372017) has 4 VCOs. This is why VCO can sweeps over a wide range by using KVCO=45MHz/V.

0 Frankly Fu over 11 years ago in reply to Jussi Saily

TI__Prodigy 140 points

Just give you a ref design for using TI's loop fiter calculator.

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TRF372017 Kv