Switched Harmonic Test - new
I am a newbie to RF and was given a schematic to do pcb layout and simulation (cadence allegro & sigrity)
Schematic given:
Components used:
(a) Switches: Peregrine 42522
(b) Mixer: LTC5549 (with built-in LO frequency doubler) path measures H2 & H3 for 2.3GHz - 2.7GHz, 3.3GHz - 3.8GHz
(c) HFCN-4400+
(d) Southwest Microwave 292-06A-5 (SMA Jack 50ohm edge mount)
(e) Through path measures Power Out , ACLR, etc.
Downloaded each component reference design, “cut & paste” and modify into one layout file.
SMA1 & SMA2 trace length 0.909”, trace width 0.025”, trace thickness 2.8oz, ground strip separation 0.008”
Some questions below:
1- Mixer LO max 6GHz.
For wavelength calculation, the frequency value is 6GHz ?
2- Is it true, RF trace length ideally should be less than 20mm.
Current trace length 0.909” (23mm)
3- SMA3 total trace length
(a) Does it need to match length with SMA1 & SMA2 0.909”
(b) Total trace length = Mixer U3.pin 11 to SMA3 ?
4- May I know what is the difference between (a) Coated Microstrip (b) Coated Coplanar Waveguide with Ground ? and which to use ?
Plan: PCB material RO4350 & 4403, Er: 3.5, 4 Layers, Board thickness 0.062"
5- Saw some RF reference designs, there are something like test coupon with different trace length.
Need to implement ?