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How LNB circuit work

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RITESH KAKKAR

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Hello,
i open the LNB and found this chip on PCB the LNB convert the high Freq 10Ghz to IF 1GHZ what is the use of chip and how this lnb work

**broken link removed**

znbg3211


bsc621-2dinside.jpg
 
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ZNBG3210 is the core bias and control element of LNB circuit. The ZNBG provides the negative rail, FET bias control, polarization switch control, tone detection and band switching with the minimum of external components.

ZNBG3210.png
 

how the oscillator look and where is it?
What is negative rail ?
 

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