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MRF89XA Scheda tecnica(PDF) 97 Page - Microchip Technology

Il numero della parte MRF89XA
Spiegazioni elettronici  Ultra Low-Power, Integrated ISM BandSub-GHz Transceiver
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Produttore elettronici  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MRF89XA Scheda tecnica(HTML) 97 Page - Microchip Technology

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 2010-2017 Microchip Technology Inc.
Preliminary
DS70000622D-page 97
MRF89XA
4.5.2
SUGGESTED PA BIASING AND
MATCHING
The recommended PA bias and matching circuit is
illustrated in Figure 4-5.
FIGURE 4-5:
RECOMMENDED PA BIASING AND OUTPUT MATCHING
Refer to Section 4.8, Bill of Materials for the opti-
mized matching arrangement for each frequency band.
4.5.3
COMMON INPUT AND OUTPUT
FRONT-END
The Receiver and Transmitter share the same RFIO
pin (pin 31). Figure 4-6 illustrates the configuration of
the common RF front-end.
In Transmit mode, the PA and the PA regulator are
active, with the voltage on the PARS pin equal to the
nominal voltage of the regulator (1.8V). The external
inductance is used to bias the PA.
In Receive mode, both the PA and the PA regulator are
OFF and PARS is tied to the ground. The RF choke
inductor is then used to bias the LNA.
FIGURE 4-6:
FRONT-END
DESCRIPTION
PARS
RFIO
100 nH
0.047 µF
SAW
Low-pass and DC block
PA
Antenna
port
DC block
1W 1%
RFIO
PARS
PA
PA
RX ON
LNA
To
Antenna
Regulator
(1.8V)


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