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http://hdl.handle.net/1783.1/4742
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| Title: | A 1.0-V CMOS class-E power amplifier for bluetooth applications |
| Authors: | Song, Ping |
| Issue Date: | 2005 |
| Abstract: | In recent RF front-end IC designs, CMOS technology has gained much more popularity for its low cost and feasibility of single-chip solutions. The applicability of scale-down CMOS technology further improves the performance which is comparable to the designs using BiCMOS, GaAs and SiGe. Power amplifier, the most power-hungry building block in the RF transmitter front-end, is always designed so that high efficiency is achieved to save power.
In addition, recent trend has placed more focus on low-voltage, low-power design. Since the power amplifier is essential in terms of power consumption and efficiency that will degrade when decreasing the supply voltage, an optimized Power-Added-Efficiency (PAE) should be achieved under low voltage.
In this thesis, the design considerations of a RF CMOS power amplifier under low supply voltage are detailed. A two-stage power amplifier operating at 2.4GHz under a 1-V supply voltage has been designed and fabricated for Bluetooth applications in a standard 0.18-μm CMOS technology. Different from existing methods, an on-chip transformer Q-enhancement circuitry is designed and utilized in the pre-amplifier design. This kind of topology effectively enhances Q of on-chip inductor as well as keeping its inductance value unchanged. For the second stage, the topology is an injection-mode locking which effectively relaxes the pre-amplifier driving problem.
At the measurement stage, with the input power of -6dBm, an output power of 15.6dBm is achieved under a 1-V supply voltage with PAE 39.5%. The output power could go as high as 20.3dBm under a 1.8-V supply voltage with PAE 43%, which could be used for Class 1 Bluetooth applications. When applying a Bluetooth-modulated signal to the input of the PA, the measured output spectrum is well under the Bluetooth mask. |
| Description: | Thesis (M.Phil.)--Hong Kong University of Science and Technology, 2005
xv, 129 leaves : ill. ; 30 cm
HKUST Call Number: Thesis ELEC 2005 Song |
| URI: | http://hdl.handle.net/1783.1/4742 |
| Appears in Collections: | ECE Master Theses
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