Design of Wideband Phase Modulator for 2.4~5.25 GHz Digital Polar Transmitter

This paper presents a wideband phase modulator for 2.4~5.25GHz digital polar transmitter implemented in 22 nm CMOS process. The phase modulator is an open-loop phase modulation architecture for wide bandwidth, and modulates the output phase according to the principle of vector-sum. The core circuit...

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Bibliographic Details
Main Authors: Zhu, Haoliang, Li, Zhiqun, Li, Zhennan, Yao, Yan
Format: Conference Proceeding
Language:English
Subjects:
Frequency modulation
Local oscillators
Phase modulation
Power demand
Simulation
Temperature distribution
Transmitters
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Summary:This paper presents a wideband phase modulator for 2.4~5.25GHz digital polar transmitter implemented in 22 nm CMOS process. The phase modulator is an open-loop phase modulation architecture for wide bandwidth, and modulates the output phase according to the principle of vector-sum. The core circuit of the phase modulator is a high-resolution I/Q phase interpolator (PI), which achieves phase modulation by the weighted summation of in-phase (I) and quadrature (Q) signals. Differential-current DACs are used to implement the I/Q weighting. The simulation results show that in the range of 2.4~5.25GHz, the power consumption is 11mW, the phase resolution is 0.7°, and the operating temperature covers -40~85℃.
ISSN:2162-755X
DOI:10.1109/ASICON52560.2021.9620405