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Filtering Requirements for FDD + TDD CA Scenarios

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Pei-Che Chang
Pei-Che Chang

Filtering Requirements for FDD + TDD CA Scenarios and desense analysis with/without B41 high pass filter(HPF)

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1 Filtering Requirements for FDD + TDD CA Scenarios Jay Chang
2 雖然2593(B41) – 1745(B3) = 848 MHz 但在B41 Rx LNA只要訊號過大還是會讓WTR飽和 導致解調差或是有Tx desense 所以通常我們都會在TDD PRx DRx部分WTR前面放一顆HPF 讓他對Tx band有足夠的rejection
3 Issue Description and Root Cause Analysis Sensitivity degradation during FDD + TDD DL CA scenarios. • This issue applies to CA cases with FDD (mid band) + TDD (high band) DL CA scenarios such as B1 + B40, B1 + B41, B25 + B41, B3 + B38, and B3 + B40… • In FDD + TDD CA, the FDD band is always assigned as PCell (Tx active). • The TDD band is assigned only as Scell. The FDD Tx power leaks into the TDD Rx LNA and generates IM2 causing desense. • The TDD Rx filters do not provide enough out-of-band rejection in the MB range. • Maximum MB Tx leakage allowed at the TDD Rx LNA input is -27 dBm. For example, consider B25 + B41: • Assume: B25 Tx = +23 dBm at antenna connector, and 10 dB antenna isolation. • B41 BPF provides 20 dB rejection in B25 Tx band. • B25 Tx leakage in B41 Rx LNA is about -8 dBm.
4 WTR3925 LTE receiver performance Table LTE Rx performance specifications 80-NH379-1
5 Recommended Solution QTI recommends adding a HPF on the TDD PRx and DRx paths to provide required rejection in the FDD Tx band and ensure proper RF performance in CA mode. • Recommended part number is Taiyo Yuden FI 168H2593GG-TXQ. Refer to the most recent TDD filter specifications for requirements: 80-N4652-41, 80-NH405-5, 80-NH405-6, and 80-NH405-7.
6 B41 (Full-Band), LTE 2600, Rx-Tx Filter Specifications
7 The B41 HPF(RAP5) we used in IXX
8 24.5 – 10 = 14.5 14.5 – 0.23 = 14.27 14.27 – 0.37 = 13.9 FDD MB leakage power in TDD HB path 13.9 – 20 = -6.1 Without B41 HPF -6.1 – 1 = -7.1 With B41 HPF -6.1 – 29 = -35.1
IM2 (dBm) = 2Pin (dBm) – IIP2 (dBm) + G (dB) = 2Pout (dBm) – OIP2 (dBm) ==> Pout 成分 IIP2 With WCDMA TX Leakage If the signal is AM modulated, such as Tx leakage signal, the 2 tone formula above can not be fully applied. The difference between the formula and 2 tone signal is called correction factor [1]. [1] Walid Y. Ali-Ahmad, “Effective IM2 estimation for two-tone and. WCDMA modulated blockers in zero-IF,” RF Design, April 2004. WCDMA PRx Desense Due to Tx Leakage IP2 Noise IM2 @ the LNA input = 2 × (Tx level @ the DPx Tx input - DPx TRx isolation @ Tx frequency) - WTR Rx IP2 - the correction factor. 為啥需要為啥需要為啥需要為啥需要 correction factor ?? DC Zero-IF 干擾干擾干擾干擾 Wanted signal Tx leakage IBB OOB ……or modulated signal (+ correct factor) (+ correct factor) Review…
10 Total IP2: 73 – 15.7 = 57.3 Calculate the desense without B41 HPF Without B41 HPF -6.1 – 1 = -7.1
11 Calculate the desense with B41 HPF With B41 HPF -6.1 – 29 = -35.1
12 Why max MB Tx leakage @ LNA input < -27dBm ? Because of the contribution of IP2 desense caused by Tx leakage < 0.1 dB in all TDD Rx LNA input.
13 However in 3 generation LPAMiD, we don’t add the HPF @ TDD Rx LNA input anymore Because QTI improve the filter rejection inside 3 gen LPAMiD.

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Filtering Requirements for FDD + TDD CA Scenarios

  • 1. 1 Filtering Requirements for FDD + TDD CA Scenarios Jay Chang
  • 2. 2 雖然2593(B41) – 1745(B3) = 848 MHz 但在B41 Rx LNA只要訊號過大還是會讓WTR飽和 導致解調差或是有Tx desense 所以通常我們都會在TDD PRx DRx部分WTR前面放一顆HPF 讓他對Tx band有足夠的rejection
  • 3. 3 Issue Description and Root Cause Analysis Sensitivity degradation during FDD + TDD DL CA scenarios. • This issue applies to CA cases with FDD (mid band) + TDD (high band) DL CA scenarios such as B1 + B40, B1 + B41, B25 + B41, B3 + B38, and B3 + B40… • In FDD + TDD CA, the FDD band is always assigned as PCell (Tx active). • The TDD band is assigned only as Scell. The FDD Tx power leaks into the TDD Rx LNA and generates IM2 causing desense. • The TDD Rx filters do not provide enough out-of-band rejection in the MB range. • Maximum MB Tx leakage allowed at the TDD Rx LNA input is -27 dBm. For example, consider B25 + B41: • Assume: B25 Tx = +23 dBm at antenna connector, and 10 dB antenna isolation. • B41 BPF provides 20 dB rejection in B25 Tx band. • B25 Tx leakage in B41 Rx LNA is about -8 dBm.
  • 4. 4 WTR3925 LTE receiver performance Table LTE Rx performance specifications 80-NH379-1
  • 5. 5 Recommended Solution QTI recommends adding a HPF on the TDD PRx and DRx paths to provide required rejection in the FDD Tx band and ensure proper RF performance in CA mode. • Recommended part number is Taiyo Yuden FI 168H2593GG-TXQ. Refer to the most recent TDD filter specifications for requirements: 80-N4652-41, 80-NH405-5, 80-NH405-6, and 80-NH405-7.
  • 6. 6 B41 (Full-Band), LTE 2600, Rx-Tx Filter Specifications
  • 7. 7 The B41 HPF(RAP5) we used in IXX
  • 8. 8 24.5 – 10 = 14.5 14.5 – 0.23 = 14.27 14.27 – 0.37 = 13.9 FDD MB leakage power in TDD HB path 13.9 – 20 = -6.1 Without B41 HPF -6.1 – 1 = -7.1 With B41 HPF -6.1 – 29 = -35.1
  • 9. IM2 (dBm) = 2Pin (dBm) – IIP2 (dBm) + G (dB) = 2Pout (dBm) – OIP2 (dBm) ==> Pout 成分 IIP2 With WCDMA TX Leakage If the signal is AM modulated, such as Tx leakage signal, the 2 tone formula above can not be fully applied. The difference between the formula and 2 tone signal is called correction factor [1]. [1] Walid Y. Ali-Ahmad, “Effective IM2 estimation for two-tone and. WCDMA modulated blockers in zero-IF,” RF Design, April 2004. WCDMA PRx Desense Due to Tx Leakage IP2 Noise IM2 @ the LNA input = 2 × (Tx level @ the DPx Tx input - DPx TRx isolation @ Tx frequency) - WTR Rx IP2 - the correction factor. 為啥需要為啥需要為啥需要為啥需要 correction factor ?? DC Zero-IF 干擾干擾干擾干擾 Wanted signal Tx leakage IBB OOB ……or modulated signal (+ correct factor) (+ correct factor) Review…
  • 10. 10 Total IP2: 73 – 15.7 = 57.3 Calculate the desense without B41 HPF Without B41 HPF -6.1 – 1 = -7.1
  • 11. 11 Calculate the desense with B41 HPF With B41 HPF -6.1 – 29 = -35.1
  • 12. 12 Why max MB Tx leakage @ LNA input < -27dBm ? Because of the contribution of IP2 desense caused by Tx leakage < 0.1 dB in all TDD Rx LNA input.
  • 13. 13 However in 3 generation LPAMiD, we don’t add the HPF @ TDD Rx LNA input anymore Because QTI improve the filter rejection inside 3 gen LPAMiD.