A radio frequency front-end circuit structure

Abstract

The invention provides a radio frequency front-end circuit structure, which comprises a receiver radio frequency front-end and a transmitter radio frequency front-end. A first switching tube is joined between a low noise amplifier in the receiver radio frequency front-end structure and an impedance matching network, a second switching tube is joined between the low noise amplifier and a power supply, a third switching tube is joined between a radio frequency power amplifier in the transmitter radio frequency front-end structure and the impedance matching network, and a fourth switching tube is joined between the radio frequency power amplifier and the power supply. Enablement of all the above-mentioned switching tubes is controlled by enable signals generated by a digital baseband, and the low noise amplifier and the radio frequency power amplifier employ the same off-chip inductor, which is connected with a receiving antenna. The radio frequency front-end circuit structure in the invention is simple without a duplexer and guarantees the proper functioning of a transceiver in two states; has only one off-chip inductor instead of two, thereby reducing the cost and area of passive devices; and guarantees all the performances of the transceiver.

Description

technical field [0001] The invention belongs to the field of radio frequency integrated circuits, and in particular relates to a radio frequency front-end circuit structure. Background technique [0002] In the past ten years, the development and research of radio frequency integrated circuits (RFICs) have developed rapidly, which is mainly due to the prosperity of the wireless communication market. These wireless applications include pagers, cordless phones, radio frequency identification (RFID), digital cellular mobile phones (GSM, CDMA) and the global positioning system (GPS). [0003] The market has higher and higher performance requirements for wireless products. In emerging electronic consumer products, it is especially necessary to meet the requirements of low cost, low power consumption, small size, and high performance. Improving the integration of transceivers is undoubtedly to meet the above requirements. important way. [0004] The wireless transceiver (transmi...

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Problems solved by technology

Therefore, the duplexer must be used for isolation control between the antenna, receiver, and transmitter, otherwise, when used as a receiver, the impedance matching network of the transmitter PA will affect the input impedance Zin of the LNA in the receiver, making If it is not 50Ω, the LNA cannot achieve impedance matching, which seriously affects the signal reception; on the contrary, when it is used as a transmitter, the impedance matching network of the LNA in the receiver will affect the output impedance Zout of the PA in the transmitter, so that it does not Even if it is 50Ω, impedance matching cannot be achieved

Additionally, from Figure 4 We also see that such a system not only requires the presence of a duplexer, but also cumbersomely requires the use of two off-chip inductors (L11 and L21), which increases the cost of the entire chip

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