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IMD3Third-Order Intermodulation Distortion
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Figure S1: IR spectra of samples IML2, IML3, IMD1, IMD2, IMD3, and acrylic polymers.
This presents that the simultaneous suppressions of IMD3 and IMD5 are achieved by choosing an appropriate bias current and RF input power for the LD.
Caption: Figure 3: The linear gain and third-order intermodulation distortion (IMD3) of the AFE.
In this work, to meet the ACLR specification at high output power, a passive pre-distorter is integrated at the input of the class-E PA to provide third order intermodulation (IMD3) cancellation.
As shown in Figure 6 and Table 2, the spectrum error at IMD2 and IMD3 of VL model is a little large, the asymmetry between the upper and lower sidebands has been weakened, and some of the memory effect characteristics are lost.
Last, the linearity is improved by suppressing second harmonic in [16] and this work (CRLH-TL), the max Pout of [16] is 15 dB smaller than that of this work (CRLHTL), but this work (CRLH-TL) still maintaining a comparable IMD3. In [25, 26], although the test signals are 20 MHz and 10 MHz, which are smaller than the bandwidth of this work (CRLH-TL), the ACPRs are still no more than that of this work (CRLH-TL); The IMD3 of this work (CRLH-TL) is approximate -40 dBc at 38 dBm, same as the IMD3 of [27], but the proposed DPA of this work (CRLH-TL) is able to operate in a higher power level, and the linearity also improved significantly after DPD.
The appear of this sweet spot is caused by the change of sign in the IMD3 current (interaction between small and large signal) observed using diodes, leading to IMD3 current equal to zero in this point (Figure 14).
IMD3 is defined as the ratio, in dB, of the amplitude of the third order intermodulation component to that of the fundamental component [26]:
For the DGS PA, the improvements obtained for IMD3 and IMD5 are approximately 4.4 and 4.5 dB at [P.sub.o] = 29 dBm/tone.
At linear operation, at -40 dBc IMD3, the output power increases by 1 dB.