Si446x/Si4362 RX LNA Matching
●Introduction
■The purpose of this application note is to provide a description of the impedance matching of the RX differential low noise amplifier (LNA) on the Si446x/Si4362 family of RFICs.
■It is desired to simultaneously achieve two goals with the matching network:
◆Match the LNA input to the antenna source impedance (e.g., 50Ω) ◆Provide a single-ended-to-differential conversion function (i.e., a balun)
■The matching procedure outlined in this document provides for achieving the goals listed above.
■For those users who are not interested in the theoretical derivation of the match network, but are just concerned with quickly obtaining matching component values, refer to the Summary Tables shown in "4.1.7. Summary Tables of 3-Element Match Network Component Values vs. Frequency" on page 12 and "4.2.7. Summary Tables of 4-Element Match Network Component Values vs. Frequency" on page 19.
■Measurements were performed on the Si4461-B0 chip but are applicable to other members of the Si446x family of chips (e.g. Si446x-B1, C0, C1, C2 and the Si4362 chip).
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Technical Documentation |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2017/07/27 |
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Rev. 0.4 |
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AN643 |
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3.5 MB |
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