HMC1023 Noise Figure vs. Gain

How does the 10 dB noise figure of HMC1023 change as the gain of the VGA changes?

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    •  Analog Employees 
    on Jul 26, 2014 4:56 AM

    Note that there are only two discrete gain settings for the HMC1023 - nominally 0 dB (min. gain) and 10 dB (max. gain), as set by bit [4] of Register 02h, but no possible gain settings in-between.  Table 1 of the datasheet (p. 2 in v01.0113) lists noise figure as a function of these two gain states and two exemplary source impedance values (100 Ohm and 1 kOhm), ranging between 12 dB and 25 dB.  The front page of the datasheet advertises 10 dB as highlighted by Eamon - presumably in high gain, but at what input impedance?

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  • 0
    •  Analog Employees 
    on Jul 26, 2014 4:56 AM

    Note that there are only two discrete gain settings for the HMC1023 - nominally 0 dB (min. gain) and 10 dB (max. gain), as set by bit [4] of Register 02h, but no possible gain settings in-between.  Table 1 of the datasheet (p. 2 in v01.0113) lists noise figure as a function of these two gain states and two exemplary source impedance values (100 Ohm and 1 kOhm), ranging between 12 dB and 25 dB.  The front page of the datasheet advertises 10 dB as highlighted by Eamon - presumably in high gain, but at what input impedance?

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