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Agilent 8762/3/4A,B,C
Coaxial Switches
Product Overview
High performance switches for > 90 dB at 18 GHz for the B model The 8763A, 8763B, and 8763C
microwave and RF instrumentation and > 50 dB at 26.5 GHz for the C (Figure 2) have 4 RF ports with one
model. All models terminate the internal 50 termination designed
and systems unused port with 50 , a key feature for applications requiring a transfer
for your applications where low SWR switch or a cross switching element.
Agilent Technologies offers a versatile is required on all ports.
line of multiport coaxial switches. These
50 mechanical-latching switches
come with the performance and relia-
bility that you have come to expect in
Agilent microwave accessories.
Offering excellent electrical and
mechanical performance with broad-
band operation, high isolation, low
SWR, long life, and exceptional
repeatability, these switches are
designed with your applications in
mind. Frequency ranges are available
to 4 GHz and 18 GHz for the A and B
models with SMA connectors and to
26.5 GHz for the C models with APC-
3.5 connectors.
The 8762A, 8762B, and 8762C
(Figure 1) are single-pole double-
throw switches with high isolation,
> 100 dB at 4 GHz for the A model, Figure 1. Agilent 8762 Figure 2. Agilent 8763
The 8764A, 8764B, and 8764C Transfer switching Reverse signal path
(Figure 3) round out the family with For applications requiring a "transfer Figure 6 shows how an 8762 and
5 RF ports, giving you flexibility to switch," as shown in Figure 5, an 8764 may be used to provide a
configure the switch for your specific 8763A, B, or C is the ideal choice to "transceiver" configuration. This
needs. insert a component, such as a filter or example illustrates how one amplifier
mixer, into a signal path. Another pop- can be used to transmit or receive.
Solenoid Common Solenoid ular use is to switch between a device Any application where the signal
drive pin #1 drive pin drive pin #2 under test and a through path for path direction needs to be reversed
(-) (+) (-) system calibration. The 8763A,B,C's could use this configuration.
internal load can terminate the device
under test when in the through mode
(up to 1 watt).
Pivot
armature
Signal Signal
in out
2 3
1 4
Port 1 Port 2 Port 3 Port 4 Port 5 Device
Figure 3. Agilent 8764
Figure 5. Agilent 8763 used as a transfer
switch (equivalent circuit action)
Applications
Multi-source switching
The 8762A, 8762B or 8762C is an 8762 8764
excellent choice for applications Solenoid Common Solenoid Solenoid Common Solenoid
drive pin #1 drive pin drive pin #2 drive pin #1 drive pin drive pin #2
where you require selection of (-) (+) (-)
(-) (+) (-)
multiple signal sources, frequency
counters, or signal control devices
such as modulators or filters, or
routing signals from multiple
sources as shown in Figure 4. Pivot Pivot
armature armature
Signal
source A
1 C 2 1 2 3 4 5
Signal 8762B 50 50
source B
To receiver
Figure 4. Multi-source switching Figure 6. Signal reversal
2
Portable and remote applications In addition, the built-in firmware
Due to their small package size, light makes it possible to define often used
weight, low power consumption, and switch paths. With the path com-
high reliability, these switches are mand, macros can be designed which
ideal for your portable or remote open and close the right solenoids to
applications. The light weight and select the desired switch port, and
repeatability make them well suited the path may be given a meaningful
for portable spectrum analyzers and name. Remember that only one select
other portable microwave test equip- pin should be activated at one time to
ment. Their 1,000,000 cycle life make prevent rapid cycling of the switch.
them the ideal candidate for system
design, such as communications Both the 87130A and 70611A provide
repeaters or remote monitoring sta- position monitoring and reporting,
tions that demand minimal mainte- which make it possible for a program
nance. The switch's automatic coil to determine if all the switches are in
disconnect feature and low current their proper state (position) before the
drain during switching minimize the program continues with testing. A
amount of power needed for operat- programmable wake up condition
ing the switches. makes it possible to ensure that the
matrix or switching system starts up
Dedicated switching in a predetermined state, to prevent
For larger switching systems, where damage to delicate equipment from
many switches will be used to provide excessive power. This would also be
complex signal routing, a switch driv- the state that the system returns to
er such as the 87130A or 70611A is after a power interruption.
recommended. The 87130A rack-and-
stack switch driver and the MMS- Accessory cables and adapters make
based 70611A are convenient, flexible it easy to quickly get the 8762/3/4
interface bus (GPIB) or modular sys- working with the 87130A or 70611A.
tems interface bus (MS-IB) switch Reference literature number 5963-
controllers, providing driver circuitry, 2038E, Switch Attenuator Driver
indicator readback circuitry and Configuration Guide.
firmware that makes it easy to
integrate switch components into For smaller switching needs, the
a switching system. Controlling the 11713A attenuator/switch controller
87130A is simple using either a PC or provides simple GPIB control for up
workstation based GPIB controller to ten 8762/3/4 switches. Connecting
and Agilent Interactive Test cables can be ordered which make it
Generator (Agilent-ITG) or Agilent easy to connect the switches to the
Visual Engineering Environment 11713A.
(Agilent VEE). The 70611A gives
manual control via the MMS user
interface or can also be controlled
via an GPIB equipped PC or
workstation.
3
Operation and use Remote indication (TTL options excluded) Since current is drawn through the
How the switch works The position of the switch may be solenoid for these indicator circuits,
All the switches are "break before determined by utilizing the open and inadvertent switching is prevented by
make;" the switched ports are not closed states of the internal coil con- limiting the current to 5 mA. Additional
connected to each other preventing tacts. Figure 7 displays two indicator design information may be required
possible damage to sensitive circuits. circuits, one to provide a TTL output from the component manufacturer for
The standard configuration switch and one that directly activates an the circuits described in Figure 7,
uses 24 Vdc for the switching voltage, LED. The circuits will output a TTL depending upon specific applications.
Option 876xx-0111 specifies a voltage "HI" and LED "on" if the switch is in Agilent Technologies assumes no
of 5 Vdc, and Option 876xx-015 speci- the state shown in Figure 7. When responsibility for use of any circuits
fies 15 Vdc. Options 876xx-T15 and drive pin 1 contact is closed (as described herein, and makes no repre-
876xx-T24 are TTL/5V CMOS compati- shown), RF port 2 is connected to sentations or warranties, expressed or
ble with 15 Vdc and 24 Vdc drive common port. For the Agilent 8763/4, implied, that such circuits are free
respectively. see Figures 2, 3, and Table 1 for cor- from patent infringements.
responding RF port connections. The
Driving the switch circuits shown are designed to oper-
For standard, Options 876xx-011 and ate with coil voltage of 24 V. If other
876xx-015 switches, switching is voltage switches are used, the circuit
accomplished by applying the supply components must be modified to
voltage to pin "C" and grounding the accommodate that voltage.
appropriate pin to actuate the switch-
ing mechanism. Avoid grounding both RF
path select pins as rapid cycling may
occur. After the switch is fully latched
(30 ms), the drive current is automat-
ically disconnected. If the drive cir-
cuit is pulsed, the pulse duration
must be at least 30 ms to ensure that
the switch will fully latch. For TTL/5
volt CMOS compatible drive (Options
876xx-T24 and 876xx-T15), apply the
supply voltage to pin "C," and ground
to pin #1. Switch positions by apply-
ing a TTL "high" or TTL "low" to pin
#2 as needed. See Table 1.
Figure 7. TTL and LED remote indicator circuits
1. Where xx = 2A, 3A, 4A, 2B, 3B, 4B, 2C, 3C, or 4C.
4
Standard drive TTL drive1
Model number Pin 1 Pin 2 Pin 22 RF path
8762A/B/C Ground Open TTL high 1 to C closed
2 terminated
Open Ground TTL low 2 to C closed
1 terminated
8763A/B/C Ground Open TTL high 1 to 2 closed
3 to 4 closed
Open Ground TTL low 1 terminated
2 to 3 closed
4 open
8764A/B/C Ground Open TTL high 1 open
2 to 3 closed
4 to 5 closed
Open Ground TTL low 1 to 2 closed
3 to 4 closed
5 open
Table 1. Switching logic table
7.0V Absolute max input
HIGH
3.0V Minimum on state
0.4V Maximum off state
LOW
0.0V
Figure 8. Control voltage states
1. Pin 1 is always at ground.
2. See Figure 8 for control voltage states.
5
Specifications
Agilent model numbers 8762A 8762B 8762C
8763A 8763B 8763C
8764A 8764B 8764C
Frequency range dc to 4 GHz dc to 18 GHz dc to 26.5 GHz
Insertion loss < 0.20 dB, dc to 2 GHz < 0.20 dB, dc to 2 GHz < 0.25 dB, dc to 2 GHz
< 0.25 dB, 2 to 4 GHz < 0.50 dB, 2 to 18 GHz < 0.50 dB, 2 to 18 GHz
< 1.25 dB, 18 to 26.5 GHz
Isolation > 100 dB, dc to 4 GHz > 90 dB, dc to 18 GHz > 90 dB, dc to 18 GHz
between ports > 50 dB, 18 to 26.5 GHz
SWR through line < 1.10, dc to 2 GHz < 1.10, dc to 2 GHz < 1.15, dc to 2 GHz
< 1.20, 2 to 4 GHz < 1.20, 2 to 12.4 GHz < 1.25, 2 to 12.4 GHz
< 1.30, 12.4 to 18 GHz < 1.40, 12.4 to 18 GHz
< 1.80, 18 to 26.5 GHz
Into internal < 1.10, dc to 2 GHz < 1.10, dc to 2 GHz < 1.15, dc to 2 GHz
50 load < 1.20, 2 to 4 < 1.20, 2 to 12.4 GHz < 1.25, 2 to 12.4 GHz
(8762s and 8763s) < 1.30, 12.4 to 18 GHz
< 1.80, 18 26.5 GHz
Connectors SMA (f) SMA (f) 3.5 mm (f)
Insertion loss repeatability
dc to 18 GHz 0.03 dB maximum 0.03 dB maximum 0.03 dB maximum
18 to 26.5 GHz 0.5 dB maximum
(Up to 1,000,000 cycles measured at 25