CD40LG

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CD40LG

A gene on chromosome Xq26 that encodes of a protein expressed on the surface of T cells which regulates B-cell function by binding CD40 to the B-cell surface. CD40LG is critical for immunoglobulin class switching. 

Molecular pathology
A defect in CD40LG is associated with hyper IgM syndrome due to an inability to undergo class switch.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
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In recent years, there are some new research results about signal injection including the improvement of the fundamental signal power of TWT by harmonic injection [4, 12], the harmonic and intermodulation distortions associated with two-tone modulation [13], the suppression of IMD3 by harmonic injection [14], and the particle swarm optimization algorithm (PSO) which are applied to suppress IMD [15,16].
where [a.sub.1] and [a.sub.3] represents the amplitude at fundamental frequency and IMD3 produced by the PA, respectively while [b.sub.3] is the IMD3 amplitude produced by the pre-distorter.
Work Frequency Efficiency [16] 2.3 GHz Max PAE: 32.1% [25] 2.14 GHz PAE: 46% 6 dB-BOP [26] 2.5 GHz PAE: 43% 8 dB-BOP [27] 2.01 GHz Max PAE: 43.6% This work 3.4-3.5 GHz DE: 40.1% (6 dB) CRLH-TL 30% (9 dB) This work 3.4-3.5 GHz DE :46% (6 dB) Traditional 31.8% (9 dB) Work Max [P.sub.out] Linearity [16] 31 dBm Max IMD3: -47 dBc [25] 44.5 dBm ACPR: -30 dBc @ 38 dBm [26] 47 dBm ACPR: -35 dBc @ 39 dBm [27] 42.5 dBm IMD3: -40 dBc @ 38 dBm This work 46 dBm ACPR (With DPD): CRLH-TL -49.6 dBc @ 37 dBm This work 46 dBm ACPR (With DPD): Traditional -42.9 dBc @ 37 dBm Work Signal [16] CW [25] W-CDMA [26] UMTS-LTE (10 MHz) [27] Two Tone Signal This work 16 QAM CRLH-TL (40 MHz) This work 16 QAM Traditional (40 MHz)
IMD3 (dBc) Gain (dB) Pout (dBm) PAE (%) Simulated data 29.3 12.38 37.28 49.3 Measured data 28.5 12.4 37.4 50 Table 7.
The obtained improvement in P1dB, PAE, IMD3 and IMD5 obtained were 0.45 dB, 9.1 percent, 4.4 dB and 4.5 dB, respectively.
At around -40 dBc IMD3, the output power increases by 2 dB, while the efficiency also improves by 4 percent.
Figure 5 shows the IMD3 performance of the TGA4905, 40 dBc at 20 dBm [P.sub.out].
The approach to obtain a correct answer is to measure the gain at an IMD3 frequency of 1 MHz for G(1 MHz) = 95 dB.
TABLE I TWO CATEGORIES OF NOISE SOURCES IN RF RECEIVERS FOR WIRELESS COMMUNICATIONS Intrinsic Noise Sources Extrinsic Noise Sources Tx noise leakage in Rx band Intermodulation distortion (IMD2, IMD3) Reciprocal mixing product Thermal noise (NF) Cross-modulation product Image signal Imperfectly filtered interferers References
The fundamental and third-order intermodulation power (IMD3) calculated under bias A and B are shown in Figure 8,.
Third-order inter-modulation distortion (IMD3), fifth-order intermodulation distortion (IMD5) and PAE for the Doherty-I and class B amplifiers, and for the Doherty-II and class AB amplifiers versus average output power are compared in Figures 9 and 10, respectively.