Parallel PWMs based fully digital transmitter with wide carrier frequency range.
The carrier-frequency (CF) and intermediate-frequency (IF) pulse-width modulators (PWMs) based on delay lines are proposed, where baseband signals are conveyed by both positions and pulse widths or densities of the carrier clock. By combining IF-PWM and precorrected CF-PWM, a fully digital transmitter with unit-delay autocalibration is implemented in 180 nm CMOS for high reconfiguration. The proposed architecture achieves wide CF range of 2 M-1 GHz, high power efficiency of 70%, and low error vector magnitude (EVM) of 3%, with spectrum purity of 20 dB optimized in comparison to the existing designs.
School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China.
Bo
B
Zhou
Kun
K
Zhang
Wenbiao
W
Zhou
Yanjun
Y
Zhang
Dake
D
Liu
D013016:Sound; D059015:Wireless Technology