Simulation set up for Image rejection ratio of IQ Down converter mixer

Hi Girish,

I'm not aware of an example in a workshop which shows this. I'd suggest you contact customer support.

Regards,

Andrew.

Hi Andrew,

Thank you for reply.

Spectre Circuit Simulator and Accelerated Parallel Simulator RF Analysis in ADE Explorer Workshop - Product Version 18.1 August 2018  >> in section "simulation mixers page number -337

Anyway, apart from it. I read your reply to one of question being asked about simulaton set up of  Image rejection analysis of Down converter mixer - You suggested to run PSS + PXF on mixer to plot Image rejection of mixer.  

 In pxf analysis,  IF frequency is swept and In PXF analysis each output frequency is considered and measured separately where the output frequency caused by the input frequencies are calculated.

I tried it.  LO Frq = 1.544G and Plot Voltage gain in PXF tab  Graph shows  at lower side band -1 and upper side band +1 from input source. I have question is it Conversion gain plot or  Image rejection plot?

community.cadence.com/.../1354548

As I said in the other post, pxf analysis you specify the range of output frequencies you're interested in and where the output of the circuit is, and then you can plot the transfer function from a source (e.g. your RF input source) at different sidebands. So being able to find the transfer function from both the desired input frequency and the image frequency you can find out how well your circuit rejects the image.

What isn't so straightforward is whether you are trying to combine the I and Q in some way - it's not entirely clear what you are trying to measure or what you exactly mean by "Image rejection plot". The simulator merely measures the transfer function (call it conversion gain if you like) from a sideband of the input source to the specified output frequency band.

Regards,

Andrew.

As I said in the other post, pxf analysis you specify the range of output frequencies you're interested in and where the output of the circuit is, and then you can plot the transfer function from a source (e.g. your RF input source) at different sidebands. So being able to find the transfer function from both the desired input frequency and the image frequency you can find out how well your circuit rejects the image.

What isn't so straightforward is whether you are trying to combine the I and Q in some way - it's not entirely clear what you are trying to measure or what you exactly mean by "Image rejection plot". The simulator merely measures the transfer function (call it conversion gain if you like) from a sideband of the input source to the specified output frequency band.

Regards,

Andrew.