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ZHCSJU4I November 2006 – September 2018 CC1020

PRODUCTION DATA.

封裝選項

機械數據 (封裝 | 引腳)

RSS|32
- MPQF200B

散熱焊盤機械數據 (封裝 | 引腳)

RSS|32
- QFND548

訂購信息

zhcsju4i_oa

5.11 Input and Output Matching and Filtering

When designing the impedance matching network for the CC1020 device, the circuit must be matched correctly at the harmonic frequencies as well as at the fundamental tone. A recommended matching network is shown in Figure 5-22. Component values for various frequencies are given in Table 5-8. Component values for other frequencies can be found using the SmartRF Studio software.

As can be seen from Figure 5-22 and Table 5-8, the 433 MHz network utilizes a T-type filter, while the 868/915 MHz network has a π-type filter topology.

It is important to remember that the physical layout and the components used contribute significantly to the reflection coefficient, especially at the higher harmonics. For this reason, the frequency response of the matching network should be measured and compared to the response of the TI reference design. Refer to Figure 5-24 and Table 5-9 as well as Figure 5-25 and Table 5-10.

The use of an external T/R switch reduces current consumption in TX for high output power levels and improves the sensitivity in RX. A recommended application circuit is available from the TI web site (CC1020EMX). The external T/R switch can be omitted in certain applications, but performance will then be degraded.

The match can also be tuned by a shunt capacitor array at the PA output (RF_OUT). The capacitance can be set in 0.4-pF steps and used either in RX mode or TX mode. The RX_MATCH[3:0] and TX_MATCH[3:0] bits in the MATCH register control the capacitor array.

Figure 5-22 Input and Output Matching Network

Table 5-8 Component Values for the Matching Network Described in Figure 5-22

ITEM	433 MHz	868 MHz	915 MHz
C1	10 pF, 5%, NP0, 0402	47 pF, 5%, NP0, 0402	47 pF, 5%, NP0, 0402
C3	5.6 pF, 5%, NP0, 0402	10 pF, 5%, NP0, 0402	10 pF, 5%, NP0, 0402
C60	220 pF, 5%, NP0, 0402	220 pF, 5%, NP0, 0402	220 pF, 5%, NP0, 0402
C71	DNM⁽¹⁾	8.2 pF 5%, NP0, 0402	8.2 pF 5%, NP0, 0402
C72	4.7 pF, 5%, NP0, 0402	8.2 pF 5%, NP0, 0402	8.2 pF 5%, NP0, 0402
L1	33 nH, 5%, 0402	82 nH, 5%, 0402	82 nH, 5%, 0402
L2	22 nH, 5%, 0402	3.6 nH, 5%, 0402	3.6 nH, 5%, 0402
L70	47 nH, 5%, 0402	5.1 nH, 5%, 0402	5.1 nH, 5%, 0402
L71	39 nH, 5%, 0402	0 Ω resistor, 0402	0 Ω resistor, 0402
R10	82 Ω, 5%, 0402	82 Ω, 5%, 0402	82 Ω, 5%, 0402

(1) DNM = Do Not Mount

CC1020 typ_lna_input_impdnc_200_1000_mhz_swrs045.png

Figure 5-23 Typical LNA Input Impedance, 200 to 1000 MHz

CC1020 typ_opt_pa_load_impd_433_mhz_swrs045.png

The frequency is swept from 300 MHz to 2500 MHz. Values are listed in Table 5-9.

Figure 5-24 Typical Optimum PA Load Impedance, 433 MHz

Table 5-9 Impedances at the First 5 Harmonics
(433 MHz Matching Network)

FREQUENCY (MHz)	REAL (Ohms)	IMAGINARY (Ohms)
433	54	44
866	20	173
1299	288	–563
1732	14	–123
2165	5	–66

CC1020 typ_opt_pa_load_impd_868_915_mhz_swrs045.png

The frequency is swept from 300 MHz to 2800 MHz. Values are listed in Table 5-10.

Figure 5-25 Typical Optimum PA Load Impedance, 868/915 MHz

Table 5-10 Impedances at the First Three Harmonics
(868/915 MHz Matching Network)

FREQUENCY (MHz)	REAL (Ohms)	IMAGINARY (Ohms)
868	15	24
915	20	35
1736	1.5	18
1830	1.7	22
2604	3.2	44
2745	3.6	45