Isolation and protection circuit for a receiver in a wireless communication device
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United States of America Patent
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Sep 1, 2015
Grant Date -
Nov 15, 2012
app pub date -
Apr 6, 2012
filing date -
May 12, 2011
priority date (Note) -
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Abstract
A protection circuit protects a receiver from high-energy signals. In one exemplary embodiment, the protection circuit comprises a snapback transistor and a controller. The snapback transistor comprises a gate, a drain connected to an input of the receiver and a source connected to ground. The controller configured to connect the gate to a bias voltage to close the gate in a transmit mode, and to disconnect the gate from the bias voltage to open the gate in a receive mode. The snapback transistor is configured to enter into snapback responsive to a high energy signal at the drain to provide a current path from the drain to the source even when the gate is open and thus protect the receiver.
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