A CMOS Polar Transmitter with Wide Dynamic Range
Date Issued
2011
Date
2011
Author(s)
Lin, Hou-Chung
Abstract
In this thesis, an improved pulse-modulated polar transmitter for wide dynamic range applications is presented. The utilization of an auxiliary digital gain/attenuation block in front of the digital pulse-width modulation (DPWM) block is proposed to improve the performance and cost of the conventional pulse-modulated polar transmitter. With proper digital gain/attenuation control, wide dynamic range can be achieved without requiring a wide dynamic range RF VGA block.
For validation of the proposed architecture, a radio frequency (RF) pulse generator is implemented with Taiwan Semiconductor Manufacturing Company (TSMC) 0.18μm 1P6M Mixed Signal CMOS process. The measurement results show that using the proposed technique, wide dynamic range pulse-modulated polar transmitters can be implemented accurately with ease. An RF VGA with just 21 dB of dynamic range is sufficient to pass the 80 dB power control range of the CDMA2000 standard. Measurement results also show that a DAC with 8-bit resolution for the envelope path and two DACs with 8-bit resolution for the phase path are sufficient to pass the ACPR requirements of the CDMA2000 standard. Compared to a conventional transmitter utilizing linear PAs, the proposed architecture would have lower cost and achieve much higher efficiency.
Subjects
wide dynamic range
envelope elimination and restoration
power amplifier
Type
thesis
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