capacitor and the connected drain source terminal of the mos transistor 860 constitutes the output of the cmos capacitor the gates of each mos transistor are connected through a common resistor 862 to a bias source not shown in an alternative embodiment of the present invention an integrated matching circuit can be used to connect the lna in the receiver to the pa in the transmitter as the level of integration in radio communication circuits tend to grow more functions are embodied on the same chip and off chip components are used less than ever presence of external components not only augments the manufacturing costs but also increases the pin count on the main chip the antenna switch is an example of such components this switch is used to connect the receiver to antenna in reception mode and the transmitter to antenna in transmission mode in the described exemplary embodiment of the present invention the antenna switch can be eliminated and the input of the receiver can be tied to the output of the transmitter this approach has various applications including but not limited to single chip integration since the antenna is usually single ended differential applications generally require a mechanism to convert the antenna signal from single ended to differential for connection to the differential low noise amplifier lna or the differential pa the circuit implementation for a single ended to differential lna is shown in fig4 and 47 lc circuit 646 648 and the cl circuit 652 650 matches the pa to the antenna when the pa is on and the lna is off as shown in.