| 摘要 |
<p>Method and apparatus for efficiently suppressing receiver blocking signals and transmitter overtones in a radio transceiver. In an exemplary embodiment, a transceiver includes a transmitter for generating information signals to be transmitted by the transceiver, and a receiver for processing information signals received by the transceiver. A power amplifier connected to an output of the transmitter amplifies information signals prior to transmission, and a low-noise amplifier connected to an input of the receiver amplifies received signals prior to processing. Additionally, a band-pass filter connected to an input of the low-noise amplifier filters received signals prior to amplification. Time-division multiplexing of transmitted and received signals is accomplished by a switch alternately connecting a radio antenna of the transceiver to the output of the power amplifier in the transmit path and to the input of the band-pass filter in the receive path. A bi-directional low-pass filter, situated between the antenna and the switch, is used to filter both transmitted and received information signals. The band-pass filter and the low-pass filter attenuate disruptive receiver blocking signals. The low-pass filter also attenuates unwanted transmitter overtones.</p> |
