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IMD3Third-Order Intermodulation Distortion
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3] represents the amplitude at fundamental frequency and IMD3 produced by the PA, respectively while [b.
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).
The obtained improvement in P1dB, PAE, IMD3 and IMD5 obtained were 0.
At around -40 dBc IMD3, the output power increases by 2 dB, while the efficiency also improves by 4 percent.
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.
In the linear region, IMD3 under bias B is approximately 6 dB better than that under bias A, and the intercept points (1P3) under bias A and B are +27.
The Doherty amplifier-II also shows a better efficiency but has worse IMD3 and IMD5 at a low power level and is improved at a high power level in comparison with the class AB amplifier.
Because of the linear nature of the class A device, the IMD3 at any input power level can be calculated.
For a power amplifier in the class A configuration, if the output power is backed off by 1 dB, the IMD3 products drop by 2 dB.
The IMD3 signals are offset from the carriers by the same frequency separation as the two carriers are offset from each other.