6 of 12
RF1450
Rev A0 DS070531
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
General Information
Control Logic
The switch is operable in four states (see Truth table, below). The switch is designed for two modes: Active and Stand-by. These
modes are controlled by the VDD signal. When VDD is high, the switch is active. The start-up time is defined as the switch acti-
vated is critical.
Truth Table for Switch States
Turn On Sequence
Turn Off Sequence
Note: VBATT must be applied before applying VDD when turning on the part. The part must be turned off in reverse order, VDD
first then VBATT.
Electrical Test Methods
The electrical parameters for the switch were measured on test PWB provided by the switch supplier. The test PWB includes
means for decoupling RF signals from control signal port (shunt capacitor at control signal ports).
All measurements are done with calibration plane at switch pins. The effect of test board losses and phase delay has been
removed from the results.
Reflected Harmonics Measurement
The reflected harmonics should be measured with the output ports connected to open-circuit or short-circuit impedances. An
outline of the measurement set-up is shown in Figure 1. The power in and reflected signal levels are calibrated to the DUT input
(reference plane). Note that the power is calibrated in a 50
Ω system. The assumption is made that the measurement system
is designed so that the harmonic levels of external PA, etc., are far below the signals produced by the DUT.
State
CTRL1
CTRL2
RF Path
1VLOW
VLOW
ANT-RF1
2VLOW
VHIGH
ANT-RF2
3VHIGH
VLOW
ANT-RF3
4VHIGH
VHIGH
ANT-RF4
VBATT
VDD
CTRL1
CTRL2
RF Power
1ON
OFF
OFF
OFF
OFF
2
X
ON
OFF
OFF
OFF
3X
X
ON
ON
OFF
4X
X
X
X
ON
VBATT
VDD
CTRL1
CTRL2
RF Power
1ON
ON
ON
ON
OFF
2ON
ON
OFF
OFF
X
3ON
OFF
X
X
X
4
OFF
XX
XX
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