Patent ID: 8138853
Filing Date: 2012-03-20
Classification: H03H,H04B

Abstract:
1. A circuit of a radio frequency (RF) transceiver comprising: a first antenna and a second antenna configured to selectively receive or transmit an RF signal; a first transmit/receive (T/R) switch connected to the first antenna; a transceiver chip including a receiver unit, a transmitter unit and a second T/R switch; a first impedance matching unit connected to the first T/R switch, the first impedance matching unit being configured to convert the RF signal of the first antenna into a first differential signal under a receiving mode of the first antenna and then to transmit the first differential signal to the receiver unit; a second impedance matching unit connected to the first T/R switch, the second impedance matching unit being configured to convert a second differential signal of the transmitter unit into the RF signal of the first antenna under a transmitting mode of the first antenna; and a third impedance matching unit configured to convert an RF signal of the second antenna into a third differential signal under a receiving mode of the second antenna and then to transmit the third differential signal to the receiver unit through the second T/R switch, and the third impedance matching unit configured to convert the third differential signal from the transmitter unit through the second T/R switch into the RF signal of the second antenna under a transmitting mode of the second antenna, wherein both the first impedance matching unit and the second impedance matching unit are coupled to the first antenna via the first T/R switch.