Dual-band CMOS power amplifiers
Abstract/Contents
- Abstract
- The past five years have seen the explosive growth of smartphones and tablets. In 2011, worldwide smartphone sales reached 473 million units, and since the iPad's launch in 2010, it has sold 84.1 million units. These popular mobile devices connect to a variety of wireless standards, such as Wi-Fi, Bluetooth, FM radio, GPS, and cellular, which each operate in different frequency bands. Today each frequency band requires its own wireless radio, but there is an effort to design dual-band radios capable of operating across multiple frequencies. These dual-band radios could reduce components, lower costs, and improve the energy efficiency in wireless devices. Some RF circuit blocks, such as the voltage-controlled oscillator (VCO) and low-noise amplifier (LNA), have already been designed in dual-band, but a dual-band power amplifier (PA) has remained elusive. This thesis investigates dual-band PAs in CMOS for the 802.11n WLAN standard that operates in both 2.4GHz and 5.0GHz bands. First a broadband PA that could cover both frequencies, 2.0GHz to 5.0GHz, was designed. The disadvantage of this approach was the strong 2.4GHz second harmonic at 4.8GHz that fell within the broadband range. Normally a filter could be placed after the PA to eliminate this second harmonic, but with a dual-band 2.4GHz / 5.0GHz PA, a filter cannot eliminate the 4.8GHz second harmonic without also severely degrading the 5.0GHz signal. So then tunable filters, both on-chip and off-chip, were designed to eliminate the second harmonic only during 2.4GHz operation. First a PA with on-chip tunable filter that could also serve as a dual-band matching network was designed. Next an off-chip tunable filter on PCB using discrete components was designed. This off-chip tunable filter was then integrated with the broadband and dual-band PAs to show second harmonic filtering using both on-chip and off-chip filters.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2012 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Omid-Zohoor, Kasra M |
|---|---|
| Associated with | Stanford University, Department of Electrical Engineering |
| Primary advisor | Lee, Thomas |
| Primary advisor | Wong, S. Simon |
| Thesis advisor | Lee, Thomas |
| Thesis advisor | Wong, S. Simon |
| Thesis advisor | Dutton, Robert R |
| Advisor | Dutton, Robert R |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Kasra Omid-Zohoor. |
|---|---|
| Note | Submitted to the Department of Electrical Engineering. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2012. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2012 by Kasra M Omid-Zohoor
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