Switch control circuit, semiconductor device, and radio communication device
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United States of America Patent
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Jan 20, 2015
Issued Date -
N/A
app pub date -
Nov 21, 2013
filing date -
Feb 17, 2012
priority date (Note) -
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Abstract
A switch control circuit has a first terminal, a second terminal, a third terminal, a serial-parallel converter, a selector, a driver circuit and a tri-state buffer. The serial-parallel converter converts a serial switching control signal inputted from the third terminal into first parallel switching control signals when the first terminal is at a first power-supply potential. The selector selects either the first parallel switching control signals converted by the serial-parallel converter or second parallel switching control signals inputted into the second and third terminals, depending on the potential of the first terminal. The driver circuit converts potential levels of the first parallel switching control signals or the second parallel switching control signals selected by the selector and generates parallel switching control signals with potential levels capable of switching a switch circuit.
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