Voltage converters or charge pumps find their use in many circuits. They are
extensively used in hand held devices as cell phones, pagers, PDA's and laptops.
Some of the important issues relating to design of voltage regulators for handheld
devices are size, efficiency and noise. Another important factor to be considered is
the discharge characteristic of the various batteries used by the handheld devices.
This thesis addresses the issues of tones present in the conventional switched
capacitor voltage regulator. An alternate architecture with a delta-sigma control
loop to eliminate this problem is proposed. Also discussed is a method to compute
the efficiency of switched capacitor charge pumps. A test chip implementing the new
architecture was fabricated in a 0.72-micron CMOS process. The results of the test
chip verify the improved architecture. / Graduation date: 2002
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/29933 |
| Date | 29 April 2002 |
| Creators | Rao, Arun |
| Contributors | Moon, Un-Ku |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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