Abstract
A 0.35-μm SiGe BiCMOS variable-gain power amplifier for WiMAX transmitters is presented. A voltage-controlled variable resistor is used to control the gain of the linear amplifier. An open-collector adaptive bias is utilized to obtain high linearity and efficiency. The measured power amplifier achieves a power gain of 22.2 dB, an output power of 20.6 dBm, and a power-added efficiency of 24.4% with 10-dB tuning range of linear gain.
Original language | English |
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Pages (from-to) | 2750-2753 |
Number of pages | 4 |
Journal | Microwave and Optical Technology Letters |
Volume | 49 |
Issue number | 11 |
DOIs | |
State | Published - Nov 2007 |
Keywords
- Adaptive bias
- Power amplifier
- SiGe BiCMOS
- Variable gain
- WiMAX