Hi Vfone,
Sorry to bother you again. I'm new to RF design & sorry for my poor RF knowledge.
I tried to use the software tool :
Texas Instruments Loop Filter Calculator to calculate the loop filter components for the upper and lower bounds of the output frequency 2 GHz - 4 GHz.
It gave me two sets of component values which the resistors are doubled and caps have become half of the initial value.
@2 GHz : C1 = 68.02 pF, R2 = 6981 ohm, C2 = 1240.5 pF, R3 = 6981 ohm
@4 GHz : C1 = 34.01 pF, R2 = 13962 ohm, C2 = 620.27 ohm, R3 = 13962 ohm
Could you please tell me whether is it ok to use same component value or have I done a mistake when using the loop filter calculator tool?
I got another question, This chip is below $10, however Hittite HMC586LC4B 4 - 8 GHz VCO chip is around $100.
If we use a TRF3765 and a frequency doubler,a filter and power amp, then we could easily achieve 4 - 8 GHz sweep way less than $100.
As I can understand, both can be used for generating same frequency range.
Could anyone explain what are the advantages and disadvantages of these frequency synthesizers and wideband VCOs or how they differ from each other?
cheers,
---------- Post added at 00:06 ---------- Previous post was at 00:04 ----------
Hi Mazz,
Thanks for the reply,
I'm looking for a chip with integrated VCO to reduce the number of components and to keep the cost in a minimum level of the design.
cheers