Using HMC8193 as vector modulator

Aidar on Nov 22, 2019

I need 2-8GHz quadrature modulator with DC IF. I think to use HMC8193 quadrature mixer as modulator (LO input as RFin and RF input as RFout of modulator). Is it possible to apply +10..+20 dBm (or equivalent DC voltage) to IF1 or IF2 input and get constant conversion loss from LO to RF in -30..+10 dBm power range? What approximate IP1dB level (by LO input) and LO-RF conversion loss (equal frequencies at DC IF) should I expect in this case?

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0 mthahira

on Nov 25, 2019 3:18 PM over 1 year ago
Hi,

We haven't tested this scenario before but the LO needs a constant power level of +18dBm to operate.

Thanks,
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0 Aidar on Nov 25, 2019 4:02 PM over 1 year ago in reply to mthahira

Hi,

Wouldn't constant level of IF input be replacement of constant power level of the LO? We can turn the mixer to required nonlinear mode this way, can't we?
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0 mthahira

on Nov 25, 2019 4:06 PM over 1 year ago in reply to Aidar
No that wouldn't be the case here as the IF is DC so the diodes/FETs are not switching on and off so no mixing will happen.
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0 Aidar on Dec 2, 2019 3:19 PM over 1 year ago in reply to mthahira

Thank you for response.

If I exceed recommended LO power range (14..20 dBm, according to graphs in datasheet), will LO-RF losses be much greater?
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0 mthahira

on Dec 2, 2019 6:36 PM over 1 year ago in reply to Aidar
Hi,

Pls see figure 98 in the ds which shows the LO-RF isolation at different LO power levels. Increasing the LO power level will improve the LO-RF isolation at some frequencies.

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