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ADF7023-J Datasheet(PDF) 75 Page - Analog Devices |
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ADF7023-J Datasheet(HTML) 75 Page - Analog Devices |
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75 / 100 page  ADF7023-J Rev. 0 | Page 75 of 100 PA/LNA MATCHING The ADF7023-J has a differential LNA and both a single-ended PA and differential PA. This flexibility allows numerous possibilities in interfacing the ADF7023-J to the antenna. Combined Single-Ended PA and LNA Match The combined single-ended PA and LNA match allows the transmit and receive paths to be combined without the use of an external transmit/receive switch. The matching network design is shown in Figure 85. The differential LNA match is a five-element discrete balun giving a single-ended input. The single-ended PA output is a three-element match consisting of the choke inductor to the CREGRF2 regulated supply and an inductor and capacitor series. The LNA and PA paths are combined, and a seventh-order harmonic filter provides attenuation of the transmit harmonics. In a combined match, the off impedances of the PA and LNA must be considered. This can lead to a small loss in transmit power and degradation in receiver sensitivity in comparison with a separate single-ended PA and LNA match. However, with optimum matching, the typical loss in transmit power is <1 dB, and the degradation in sensitivity is <1 dB when compared with a separate PA and LNA matching topology. Separate Single-Ended PA/LNA Match The separate single-ended PA and LNA matching configuration is illustrated in Figure 84. The network is the same as the combined matching network shown in Figure 85 except that the transmit and receive paths are separate. An external transmit/receive antenna switch can be used to combine the transmit and receive paths to allow connection to an antenna. In designing this matching network, it is not necessary to consider the off impedances of the PA and LNA, and, thus, achieving an optimum match is less complex than with the combined single-ended PA and LNA match. LNA MATCH PA MATCH CREGRF2 ADF7023-J RFIO_1P RFIO_1N RFO2 3 4 5 6 RX TX HARMONIC FILTER Figure 84. Separate Single-Ended PA and LNA Match Combined Differential PA/LNA Match In this matching topology, the single-ended PA is not used. The differential PA and LNA match comprises a five-element discrete balun giving a single-ended input/output, as illustrated in Figure 86. The harmonic filter is used to minimize the RF harmonics from the differential PA. MATCH CREGRF2 ADF7023-J RFIO_1P RFIO_1N RFO2 3 4 5 6 ANTENNA CONNECTION HARMONIC FILTER Figure 85. Combined Single-Ended PA and LNA Match CREGRF2 ADF7023-J RFIO_1P RFIO_1N RFO2 3 4 5 6 ANTENNA CONNECTION HARMONIC FILTER Figure 86. Combined Differential PA and LNA Match |
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