How to Design a 100MHz VCO Using Feedback or Negative Resistance Methods?

[Fang880607]

Hi,I am currently doing my project of designing a 100Mhz Voltage controlled oscillator,but i am stucked in the oscillator part,can anyone tell me about the oscillator between the feedback model method and negative resistance method?how to identify the result of my oscillator is work by using ADS?

 

[NascentOxygen]

Hi Fang880607! http://img96.imageshack.us/img96/5725/red5e5etimes5e5e45e5e25.gif

Over what range of frequencies do you need your VCO to work? What is the level of the control voltage?

Do you have in mind a particular circuit that you will be using?

What is ADS?

 

[Fang880607]

Hi, ADS is Advanced Design System by Agilent.It is a software like pspice and multisim for run the simulation.I need to design around 100Mhz to 500Mhz voltage controlled oscillator.any idea of the basic idea to start design a VCO?I need to using Colpitts oscillator feedback design.

 

[NascentOxygen]

Sorry. 500MHz is beyond me. 100-500 seems a big range for a VCO.

 

[Fang880607]

How about 100Mhz voltage controlled oscillator?

 

[NascentOxygen]

Are you wanting a monolithic VCO or do you need to construct one using a couple of transistors and a varactor diode? You definitely need it to deliver a sinusoidal output?

Are you going to actually build this and use it for some application, or is it just something to simulate?

http://www.qsl.net/va3iul/High_Freq.../High_Frequency_VCO_Design_and_Schematics.htm