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This paper presents a Q-band transmitter (Tx) RF front-end module which, includes a PLL, a lowpass filter and an up-converter. The PLL provides about 10 dBm of output power at 9.5996 GHz. The phase noise of PLL is better than −98 dBc/Hz offset 1 kHz. In order to suppress the harmonic frequency, the PLL is integrated with lowpass filter. The filter is variable-width stepped impedance filter and its...
This paper presents a digitally-controlled highly efficient supply modulator. This supply modulator is implemented as a multilevel converter in series with a linear amplifier. The multilevel converter output which controlled by digital signals is employed to supply the linear amplifier. The digitally controlled strategy and the optimization of the supply levels can make the converter output to approach...
In this paper, a novel single-model single-feedback digital predistortion (DPD) technique is proposed to linearize concurrent multi-band wireless transmitters. By employing carrier relocation and band-limiting functions in digital signal processing, DPD model complexity is significantly reduced and only one narrowband feedback loop is required for data acquisition. In the new system, the linearization...
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