Patent ID: 8064845
Filing Date: 2011-11-22
Classification: H04B

Abstract:
1. A T/R switch circuit for coupling a first node to a second node or a third node, comprising: a first transistor, a source of the first transistor being coupled to the first node, a drain of the first transistor being coupled to the second node and receiving a first bias, a gate of the first transistor receiving a first control voltage; a second transistor, a source of the second transistor being coupled to the first node, a drain of the second transistor being coupled to the third node and receiving the first bias, a gate of the second transistor receiving a second control voltage; a third transistor, a source of the third transistor receiving a second bias, a drain of the third transistor being coupled to the second node and receiving the first bias, a gate of the third transistor receiving the second control voltage; a fourth transistor, a source of the fourth transistor receiving the second bias, a drain of the fourth transistor being coupled to the third node and receiving the first bias, a gate of the fourth transistor receiving the first control voltage; and a power detector for detecting power of output signals of the second node and the third node so as to adjust the first control voltage, the second control voltage, the first bias, and the second bias; wherein when the power of the output signals increases, the first bias and the second bias are increased.