Digital Predistortion of Ultra-Broadband mmWave Power Amplifiers with Limited Tx/Feedback Loop/Baseband Bandwidth

Table 1

The bandwidth requirement for a 500 MHz modulated signal.

	Sampling rate (MSPS)	BW (MHz)
(i) Conventional DPD system
Tx
Feedback loop
Baseband
(ii) DPD system with reduced feedback loop bandwidth
Tx
Feedback loop	<1	<1
Baseband
(iii) DPD system with reduced Tx/FB bandwidth
Tx
Feedback loop
Baseband