flames4791
Junior Member level 3
Hi, I am trying to design a voltage controlled oscillator with a frequency range of 2.35G to 2.55G. My problem is that I am trying to vary the tank capacitance by using a MOS varactor and I cant get more than a 10MHz tuning range when I have the tuning voltage swept between 0 and 1V. I have tried many different variations of connecting the transistors like grounding the bulk, connecting bulk to drain and source and connecting to voltage supply as well as pmos transistors hvt and lvt transistors. Can anyone help me get a good capacitance swing?