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Design >> Analog Design >> Local Oscillator Buffer Design
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Message started by Hendy06 on Nov 11^th, 2008, 9:36pm

Title: Local Oscillator Buffer Design
Post by Hendy06 on Nov 11^th, 2008, 9:36pm

I need to design an LO buffer that drives a double balanced mixer, but i'm not sure what the structure of the oscillator will look like. I understand that the LO will be fixed at a specific frequency, so is it ok to use a VCO type structure to create the oscillator? Or can i just use a pulse generator to produce the LO signal? Would anyone be able to point me to references that might inspire me?

Title: Re: Local Oscillator Buffer Design
Post by fonseca.ha on Nov 16^th, 2008, 11:27am

Hi. Can you give some more details about the problem. Are you also designing the oscillator or just the buffer? Do you get from the oscillator a differential signal? Will you have to drive rail to rail into the mixer?

Title: Re: Local Oscillator Buffer Design
Post by Hendy06 on Nov 22^nd, 2008, 1:46pm

Only the buffer needs to be designed. The LO buffer needs to drive the mixer with a differential signal and the assumption will be that the input to the buffer will be driven by differential signals from the VCO. The LO signal will be 300mVpp (1.8V supply).