27. 27
Calculate OXX B66 PRx desense Tx leakage in Rx band
sensitivity = equivalent noise floor @ the LNA input due to thermal noise and Tx noise in Rx band +
10 × log(BW) + NF + C/N + IL_FE.
The equivalent noise floor @ the LNA input due to thermal noise and Tx noise in Rx band is the
power sum of the thermal noise floor and Tx noise in Rx band.
Thermal noise floor @ the LNA input is about -174 dBm/Hz.
Tx noise in Rx band @ the LNA input = Σ(WTR RxBN + PA RxB gain, PA RxBN) - DPx TRx isolation at Rx
frequency.
NF is the WTR noise figure.
C/N is the required SNR for demodulation.
IL_FEis the RF front-end IL.
LTE B66 ANT0 Coupler Diplexer ASM Quadplexer e-LNA NF Rx SAW
Trace +
mismatch loss
Loss before LNA Rx NF Rx BW CN Sensitivity
Typ 0 0.2 0.42 0.98 1.7 0.8 0.8 4.9 2.3 10 -1 -100.10
Worst 0.1 0.2 0.6 1.05 2.8 1.2 1 6.95 3 10 -1 -98.05
28. 28
DONE
T W T W T W T W T W T W T W T W T W T W T W T W T W
B1 2110–2170 10 54 54 -150 -150 -136 -136 29 32.5 59 52 54 50 -167.15 -165.20 -120.86 -117.44 4.55 5.80 -170.31 -161.64 -165.44 -160.05 -96.44 -91.05 -1.71 -5.15
B2 1930–1990 10 54 54 -148 -148 -133 -133 30.5 34 66.8 55 65.6 55 -169.09 -166.80 -117.38 -113.95 4.91 7.20 -178.07 -161.75 -168.57 -160.57 -99.57 -91.57 -0.52 -6.23
B3 1805–1880 10 54 54 -148 -148 -135 -135 29.5 33 56 52 56 50 -166.75 -164.40 -118.40 -114.96 4.95 6.60 -169.45 -158.36 -164.88 -157.39 -95.88 -88.39 -1.87 -7.01
B66 2110–2200 10 54 54 -150 -150 -138 -138 28 31.5 63.5 55 63.5 55 -169.10 -167.05 -121.89 -118.45 4.90 6.95 -180.49 -166.50 -168.80 -163.76 -99.80 -94.76 -0.30 -3.29
B12 729–746 10 54 54 -151 -151 -120 -120 27 30.5 63 60 58 55 -169.23 -167.55 -118.54 -117.23 4.77 6.45 -171.77 -165.78 -167.31 -163.57 -98.31 -94.57 -1.92 -3.98
Noise floor at
antenna
with RXBN
(dBm/Hz)
Sensitivity with
RXBN
(max Tx
power)(dBm)
Desense due
to
RXBN (dB)
RXBN due to Tx
at antenna
(dBm/Hz)
Desense due to Rx band noise of Tx leakage calculation
Band
Rx
frequency
(MHz)
BW (MHz)
SDR IP2
(dBm)
SDR RBN
(dBm/Hz)
PA RBN
(dBm/Hz)
PA Rx band
gain (dB)
DPx Tx-Rx
isolation
at Tx
frequency
(dB)
DPx Tx-Rx
isolation
at Rx
frequency
(dB)
Noise floor
(dBm/Hz) at
antenna
connector
without Tx noise
Total RXBN
at PA output
(dBm/Hz)
Loss from
Rx DPx
to antenna
(dB)
OXX B66 PRx desense analysis Tx leakage in Rx band
Rx
SAW
29. 29
Calculate OXX B66 PRx desense Tx IP2 noise
Sensitivity = equivalent noise floor @ the LNA input due to thermal noise and Tx leakage IP2 noise
(IM2) + 10 × log(BW) + NF + C/N + IL_FE.
The equivalent noise floor @ the LNA input due to thermal noise and IM2 is the power sum of the
thermal noise floor and Tx leakage IP2 noise.
Thermal noise floor @ the LNA input is about -174 dBm/Hz.
IM2 @ the LNA input = 2 × (Tx level @ the DPx Tx input - DPx TRx isolation @ Tx frequency) - WTR Rx
IP2 - the correction factor.
NF is the WTR noise figure.
C/N is the required SNR for demodulation.
IL_FEis the total RF front-end IL.
LTE B66 ANT0 Coupler Diplexer ASM Quadplexer e-LNA NF Rx SAW
Trace +
mismatch loss
Loss before LNA Rx NF Rx BW CN Sensitivity
Typ 0 0.2 0.42 0.98 1.7 0.8 0.8 4.9 2.3 10 -1 -100.10
Worst 0.1 0.2 0.6 1.05 2.8 1.2 1 6.95 3 10 -1 -98.05
30. 30
OXX B66 PRx desense analysis Tx IP2 noise
DONE
T W T W T W T W T W T W T W T W T W T W T W T W T W
B1 2110–2170 10 54 54 -150 -150 -136 -136 29 32.5 59 52 54 50 -167.15 -165.20 -31.58 -22.50 -198.16 -180.00 -193.61 -174.20 -167.14 -164.69 -98.14 -95.69 -0.01 -0.51
B2 1930–1990 10 54 54 -148 -148 -133 -133 30.5 34 66.8 55 65.6 55 -169.09 -166.80 -39.97 -26.10 -214.94 -187.20 -210.03 -180.00 -169.09 -166.60 -100.09 -97.60 0.00 -0.20
B3 1805–1880 10 54 54 -148 -148 -135 -135 29.5 33 56 52 56 50 -166.75 -164.40 -28.63 -22.10 -192.26 -179.20 -187.31 -172.60 -166.71 -163.79 -97.71 -94.79 -0.04 -0.61
B66 2110–2200 10 54 54 -150 -150 -138 -138 28 31.5 63.5 55 63.5 55 -169.10 -167.05 -36.30 -25.55 -207.60 -186.10 -202.70 -179.15 -169.10 -166.79 -100.10 -97.79 0.00 -0.26
B12 729–746 10 54 54 -151 -151 -120 -120 27 30.5 63 60 58 55 -169.23 -167.55 -36.23 -31.75 -207.46 -198.50 -202.69 -192.05 -169.23 -167.53 -100.23 -98.53 0.00 -0.02
Desense due to IP2 noise of Tx leakage calculation
Band
Rx
frequency
(MHz)
BW (MHz)
SDR IP2
(dBm)
SDR RBN
(dBm/Hz)
PA RBN
(dBm/Hz)
PA Rx band
gain (dB)
DPx Tx-Rx
isolation
at Tx
frequency
(dB)
DPx Tx-Rx
isolation
at Rx
frequency
(dB)
Noise floor
(dBm/Hz) at
antenna
connector
without Tx noise
Tx leakage power
at LNA (dBm)
IP2 noise
at LNA in
(dBm/Hz)
IP2 noise
at antenna
(dBm/Hz)
Noise floor at
antenna
with IP2 noise
(dBm/Hz)
Sensitivity with
IP2
(max Tx
power)(dBm)
Desense due
to IP2 (dB)
Rx
SAW
31. 31
DONE
T W T W T W T W T W T W T W T W T W T W T W T W T W
B1 2110–2170 10 54 54 -150 -150 -136 -136 29 32.5 59 52 54 50 -167.15 -165.20 -120.86 -117.44 4.55 5.80 -170.31 -161.64 -165.44 -160.05 -96.44 -91.05 -1.71 -5.15
B2 1930–1990 10 54 54 -148 -148 -133 -133 30.5 34 66.8 55 65.6 55 -169.09 -166.80 -117.38 -113.95 4.91 7.20 -178.07 -161.75 -168.57 -160.57 -99.57 -91.57 -0.52 -6.23
B3 1805–1880 10 54 54 -148 -148 -135 -135 29.5 33 56 52 56 50 -166.75 -164.40 -118.40 -114.96 4.95 6.60 -169.45 -158.36 -164.88 -157.39 -95.88 -88.39 -1.87 -7.01
B66 2110–2200 10 54 54 -150 -150 -138 -138 28 31.5 63.5 55 63.5 55 -169.10 -167.05 -121.89 -118.45 4.90 6.95 -180.49 -166.50 -168.80 -163.76 -99.80 -94.76 -0.30 -3.29
B12 729–746 10 54 54 -151 -151 -120 -120 27 30.5 63 60 58 55 -169.23 -167.55 -118.54 -117.23 4.77 6.45 -171.77 -165.78 -167.31 -163.57 -98.31 -94.57 -1.92 -3.98
Noise floor at
antenna
with RXBN
(dBm/Hz)
Sensitivity with
RXBN
(max Tx
power)(dBm)
Desense due
to
RXBN (dB)
RXBN due to Tx
at antenna
(dBm/Hz)
Desense due to Rx band noise of Tx leakage calculation
Band
Rx
frequency
(MHz)
BW (MHz)
SDR IP2
(dBm)
SDR RBN
(dBm/Hz)
PA RBN
(dBm/Hz)
PA Rx band
gain (dB)
DPx Tx-Rx
isolation
at Tx
frequency
(dB)
DPx Tx-Rx
isolation
at Rx
frequency
(dB)
Noise floor
(dBm/Hz) at
antenna
connector
without Tx noise
Total RXBN
at PA output
(dBm/Hz)
Loss from
Rx DPx
to antenna
(dB)
Conclusion: OXX B66 PRx desense analysis Tx leakage in Rx band
Rx
SAW
32. 32
Conclusion: OXX B66 PRx desense analysis Tx IP2 noise
DONE
T W T W T W T W T W T W T W T W T W T W T W T W T W
B1 2110–2170 10 54 54 -150 -150 -136 -136 29 32.5 59 52 54 50 -167.15 -165.20 -31.58 -22.50 -198.16 -180.00 -193.61 -174.20 -167.14 -164.69 -98.14 -95.69 -0.01 -0.51
B2 1930–1990 10 54 54 -148 -148 -133 -133 30.5 34 66.8 55 65.6 55 -169.09 -166.80 -39.97 -26.10 -214.94 -187.20 -210.03 -180.00 -169.09 -166.60 -100.09 -97.60 0.00 -0.20
B3 1805–1880 10 54 54 -148 -148 -135 -135 29.5 33 56 52 56 50 -166.75 -164.40 -28.63 -22.10 -192.26 -179.20 -187.31 -172.60 -166.71 -163.79 -97.71 -94.79 -0.04 -0.61
B66 2110–2200 10 54 54 -150 -150 -138 -138 28 31.5 63.5 55 63.5 55 -169.10 -167.05 -36.30 -25.55 -207.60 -186.10 -202.70 -179.15 -169.10 -166.79 -100.10 -97.79 0.00 -0.26
B12 729–746 10 54 54 -151 -151 -120 -120 27 30.5 63 60 58 55 -169.23 -167.55 -36.23 -31.75 -207.46 -198.50 -202.69 -192.05 -169.23 -167.53 -100.23 -98.53 0.00 -0.02
Desense due to IP2 noise of Tx leakage calculation
Band
Rx
frequency
(MHz)
BW (MHz)
SDR IP2
(dBm)
SDR RBN
(dBm/Hz)
PA RBN
(dBm/Hz)
PA Rx band
gain (dB)
DPx Tx-Rx
isolation
at Tx
frequency
(dB)
DPx Tx-Rx
isolation
at Rx
frequency
(dB)
Noise floor
(dBm/Hz) at
antenna
connector
without Tx noise
Tx leakage power
at LNA (dBm)
IP2 noise
at LNA in
(dBm/Hz)
IP2 noise
at antenna
(dBm/Hz)
Noise floor at
antenna
with IP2 noise
(dBm/Hz)
Sensitivity with
IP2
(max Tx
power)(dBm)
Desense due
to IP2 (dB)
Rx
SAW
33. 33
B12 Tx 3rd harmonic
ANT-Tx att = 35~43 dB
B12 Tx 3f0 = -30~-24 dBm
att = 35 dB
FE loss = 5 dB
-99.97 dBm/Hz – 43 – 35 + 5 = -173 dBm/Hz
B12
TRx
B66
DRx
-100 dBm/Hz
-121.9 dBm/Hz
OXX B12+B66 CA desense analysis
Rx
SAW
ANT-ANT iso = 10~15 dB