Hi,

I am looking for some information on how the imbalance block in the modulator of ESG E4438 C is modeled. To be precise, if the gain imbalance and quadrature phase angle adjustment are the imbalance parameters in the quadrature arm only or equally split between the I and Q arms? Say, I specify a phase imbalance of -5 deg under the option of 'quadrature skew' angle adjustment, would the imbalance just be an offset from the Q' arm or '-2.5 deg' in both, the I and Q arms? I need the precise information because the inverse imbalance block for compensation would be modeled accordingly.

Thanks !

I am looking for some information on how the imbalance block in the modulator of ESG E4438 C is modeled. To be precise, if the gain imbalance and quadrature phase angle adjustment are the imbalance parameters in the quadrature arm only or equally split between the I and Q arms? Say, I specify a phase imbalance of -5 deg under the option of 'quadrature skew' angle adjustment, would the imbalance just be an offset from the Q' arm or '-2.5 deg' in both, the I and Q arms? I need the precise information because the inverse imbalance block for compensation would be modeled accordingly.

Thanks !

I can't say for certain, but I believe it's done on both I and Q. If it wasn't, then you would get a change in the magnitude of the vector, and that doesn't occur. The I and Q modulation is performed by splitting the carrier, phase shifting one leg 90 degrees, and then mixing the signals together. Modulation is achieved by controlling only the amplitude of each leg before mixing.