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ADF7020-1 其他数据使用手册 - ADI（亚德诺）
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高性能FSK / ASK收发器IC High Performance FSK/ASK Transceiver IC
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ADF7020-1数据手册
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AN-859
APPLICATION NOTE
One Technology Way • P. O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Te l: 781.329.4700 • Fax: 781.461.3113 • www.analog.com
RF Port Impedance Data, Matching, and External
Component Selection for the ADF7020-1, ADF7021, and ADF7021-N
by Conor O’Mahony
Rev. A | Page 1 of 12
SCOPE OF THIS DOCUMENT
This application note describes the RF port impedance models
of the power amplifier (PA) and low noise amplifier (LNA) of
the ADF7020-1, ADF7021, and ADF7021-N. The port imped-
ance values are listed for the range of frequencies over which
the ADF7020-1, ADF7021, and ADF7021-N can operate with
the external inductor VCO (130 MHz to 650 MHz). Matching
circuits, loop filter components, and VCO tank inductor values
are also provided for a range of frequency bands.
INTRODUCTION
The ADF7020-1, ADF7021, and ADF7021-N have two
RF ports: an LNA input (RFIN/RFINB) and a PA output
(RFOUT). The properties and function of these RF ports
depend on the operating mode of the transceiver, that is,
transmit (Tx) mode or receive (Rx) mode. The ports and
the different states are shown in Table 1.
The need for complex broadband models is avoided by pro-
viding simple lumped-element models for each RF port. This
simplification has the disadvantage of rendering the models
valid only in a narrow frequency band. The ADF7020-1,
ADF7021, and ADF7021-N port model has been extracted
with an approach based on fixture modeling.
The ADF7020-1, ADF7021, and ADF7021-N feature an
on-chip VCO with external tank
inductor, which is used to
set the RF frequency range. Information is provided on how
to select this external inductor for the required operating
band in the External VCO Inductor section.
Example loop filter and matching components are also given
for various popular operating bands of the ADF7020-1,
ADF7021, and ADF7021-N.
Table 1.
Port State
PA Output (Single Ended, Ground Referred) Tx: Optimum PA load impedance
Rx: PA idle impedance
LNA Input (Single Ended, Ground Referred) Tx: LNA idle impedance
Rx: LNA input impedance (maximum gain)
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