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Forum / Schematic Design & PCB Layout / Series Tuned Colpitts VCO (Clapp VCO) Design Problem via AWR MO

Series Tuned Colpitts VCO (Clapp VCO) Design Problem via AWR MO

Clarice Starling , 09-08-2024, 11:41 AM
I want to build and simulate the circuit below. Then I will draw a PCB. But I could not achieve any success in the simulation part. The output is in the attachment below. Where do you think I might be making a mistake?
Clarice Starling , 09-08-2024, 11:42 AM
Varactor Model :
QDrives , 09-08-2024, 07:56 PM
Which simulator are you using?
The schematic of the simulator (Colpitts VCO) is to small for me to read.
In my experience, semiconductors (as diode and transistors here) need models.
Clarice Starling , 09-09-2024, 03:50 PM
AWR
Clarice Starling , 09-09-2024, 03:50 PM
it has models
Clarice Starling , 09-09-2024, 03:52 PM
Bigger schematic
QDrives , 09-09-2024, 10:18 PM
Ah yes, I see "subckt" now.
Are the default parameters for the diode correct for the varactor? (ie. Ron, Roff, Vf(wd))?
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