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Hi guys,
I am trying to learn IQ calibration in an RF transiever. There is a block named CSDF. I really need some help on what it does and what’s the circuit’s structure.
I am now using one pair of signals (one for I and one for Q) and here is the single-ended circuit diagram just as an example. mine are fully differential
Hi Barry,
To my knowledge, a complex filter moves a real LPF to the right to filter out image signals. I applied AC signal to Iin and Qin. The two input signals have a 90 degree phase difference. Then,I got Iout and Qout from AC analysis in Cadence. And both of the outputs showed a lowpass...
I got two outputs but they are low pass. I didn’t see the shift of the lowpass filter. That’s why I am confused. Do you get two bandpass response on each output ports if you feed two quadrature input signal?
Hi Fvw,
The filter I’m designing is used in an RF receiver to filter out the image signal. And I fed an IQ signal to the filter. I think the input signals should be quadrature so I set a 90 phase difference between the two. I got 2 output signals and I don’t know how to analyze them. Could you...
Hi LvW,
Thank you for replying
And yes I did get 2 output signals. But I don’t know how to analyze the outputs. For example, if I want to see the bandwidth of a normal low pass filter, I just need to do an AC analysis and plot its frequency response right? However, I don’t know how to visually...
Hi，
I’m trying to simulate a complex filter recently and I am having a hard time finding a way to combine the outputs (Q and I). I am using two ac sources as inputs and there are 90 phase shift between them. But I don’t quite understand how to interpret the outputs. Is there a way to plot the...
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