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RF-PAs in 4G LTE mobile devices handle modulated signals with high peak-to-average power ratios (PAPRs) while maintaining linearity and power efficiency. Envelope-tracking technology increases the efficiency of an RF-PA by modulating its supply voltage proportionally to the RF signals. The function of an envelope-tracking supply modulator (ETSM) is to track the envelope information and provide the...
We demonstrate photonic transmitters-mixers integrated with Wilkinson power-combiners. Compared with single-ended operation, double-ended operation exhibits 5.5-dB higher output power over wide frequencies (65–100GHz). 15Gbps error-free wireless transmission with 6.6dBm output at 93 GHz is achieved.
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