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參數(shù)資料
| 型號： | AS179-000 |
| 廠商： | SKYWORKS SOLUTIONS INC |
| 元件分類： | 開關 |
| 英文描述： | 0.3 MHz - 3000 MHz RF/MICROWAVE DIVERSITY SWITCH, 0.5 dB INSERTION LOSS |
| 封裝： | GREEN, DIE PACKAGE |
| 文件頁數(shù)： | 4/5頁 |
| 文件大?。?/td> | 254K |
| 代理商： | AS179-000 |
Skyworks Solutions, Inc. Phone [781] 376-3000 Fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com
December 18, 2008 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice. 200078 Rev. E
Preliminary Data Sheet aS179-000
4
VCtl1
VCtl2
J1–J2
J1–J3
VHIGH
0
Isolation
Insertion loss
0
VHIGH
Insertion loss
Isolation
0
Not allowed
VHIGH
Not allowed
Truth Table
Parameter
description
J1
rF Common — RF input/output port that is connected via low impedance path to either RF1 or RF2, depending upon the
voltage applied to control voltage pin. External DC block required for positive control voltages.
J2, J3
rF input/Output — RF input/output port that is connected via low impedance path to either RF common (J1) or to ground,
depending upon the voltage levels applied to control voltage pins. External DC block required for positive control voltages.
V1, V2
Control Voltage inputs — Combination of voltage logic levels applied to these pins determines the state of the RF paths
between J1 and J2/J3.
GND
Ground — Should be down-bonded to circuit ground
Port Descriptions
Theory of Operation
The AS179-000 Single Pole Double Throw (SPDT) switch
comprises two RF signal paths, one of which connects the RF
common pin (J1) to RF1 (J2) and the other connects RF common
to RF2 (J3). Depending upon the logic voltage levels applied to
the control voltage pins (V1 and V2), one of these paths is in
its minimum insertion loss state while the other is in its high-
isolation state. When these logic levels are toggled, the state of
each of the paths toggles accordingly.
Starting at the RF common pin, each signal path is comprised
of a depletion mode PHEMT, Q2 or Q3, in series with the signal
path, followed by another depletion mode PHEMT, Q1 or Q4,
in shunt with the signal path. A HI logic level applied to the
control voltage pin V1 and a low logic level applied to the con-
trol voltage pin V2 forces the path between RF common and
RF1 into its high-isolation state and the other path, from RF
common to RF2, into its low insertion loss state.
The shunt PHEMT to common, Q1 or Q4, is biased to produce
minimum impedance when the signal path of which it is part is
placed into its isolation state. Consequently, the magnitude of
the reflection coefficient looking into this pin is close to 1, that
is, the VSWR looking into that port approaches infinity.
The AS179-000 can operate with control voltage from 3 V up
to 5 V.
The logic threshold voltage for the control voltage pin is one
half of the minimum high control voltage. The impedance
looking into each of the control voltage pins is several tens of
kilohms. For positive control voltage, DC blocks are required on
each RF port.
Applications
The AS179-000 SPDT switch can be used in a number of ways:
it can be used to select one of two loads; it can also be used
to alternately connect an antenna to a radio transmitter and
receiver, etc.
Transmit-Receive Switch
A SPDT switch can be used as a transmit-receive (TR) switch,
to alternately connect a transmitter and a receiver to a single
antenna in a single duplex system.
Simplified Block Diagram
Control
Voltage
2
Control
Voltage
1
RF
Common
(J1)
RF1
(J2)
RF2
(J3)
Q1
Q2
Q3
Q4
LO
IF Output
Low
Noise
Amplifier
Downconverter
Mixer
AS179-000 SPDT
TR Switch
Power
Amplifier
Upconverter
Mixer
IF or BB Input
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