| 摘要 |
An enhanced sensitivity radio frequency (RF) front end circuit includes a transformer configured to convert a balanced transmit signal to an unbalanced transmit signal and to convert a second filtered receive signal to a balanced receive signal. A switch in a first state receives the unbalanced transmit signal from the transformer and transfers the unbalanced transmit signal to an amplifier circuit and receives an amplified transmit signal from the amplifier circuit and transfers the amplified transmit signal to a filter. In a second state, the switch receives a first filtered receive signal from the filter and transfers the first filtered receive signal to the amplifier circuit and receives a second filtered receive signal from the amplifier circuit and transfers the second filtered receive signal to the transformer. In a first state, the amplifier circuit receives the unbalanced transmit signal from the switch and amplifies the unbalanced transmit signal to generate the amplified transmit signal, and in a second state, the amplifier circuit receives the first filtered receive signal from the switch and attenuates selected first frequencies to generate the second filtered receive signal.
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