high performance switches for microwave and rf instrumentation and systems agilent technologies offers a versatile line of multiport coaxial switches. these 50 ? mechanical-latching switches come with the perfor mance 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, > 90 db at 18 ghz for the b model and > 50 db at 26.5 ghz for the c model. all models terminate the unused port with 50 ? , a key feature for your applications where low swr is required on all ports. the 8763a, 8763b, and 8763c (figure 2) have 4 rf ports with one internal 50 ? termination designed for applications requiring a transfer switch or a cross switching element. agilent 8762/3/4a,b,c coaxial switches product overview figure 1. agilent 8762 figure 2. agilent 8763
2 the 8764a, 8764b, and 8764c (figure 3) round out the family with 5 rf ports, giving you flexibility to configure the switch for your specific needs. applications multi-source switching the 8762a, 8762b or 8762c is an excellent choice for applications 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. transfer switching for applications requiring a transfer switch, as shown in figure 5, an 8763a, b, or c is the ideal choice to insert a component, such as a filter or mixer, into a signal path. another pop- ular use is to switch between a device under test and a through path for system calibration. the 8763a,b,cs internal load can terminate the device under test when in the through mode (up to 1 watt). reverse signal path figure 6 shows how an 8762 and 8764 may be used to provide a transceiver configuration. this example illustrates how one amplifier can be used to transmit or receive. any application where the signal path direction needs to be reversed could use this configuration. port 1 port 2 port 3 port 4 port 5 pivot armature solenoid drive pin #1 solenoid drive pin #2 common drive pin (-) (-) (+) figure 3. agilent 8764 signal source a signal source b to receiver 8762b figure 4. multi-source switching 2 1 4 3 signal in signal out device figure 5. agilent 8763 used as a transfer switch (equivalent circuit action) 50 ? 1 c 2 50 ? pivot armature solenoid drive pin #1 solenoid drive pin #2 common drive pin (-) (-) (+) 1 2 3 4 5 pivot armature solenoid drive pin #1 solenoid drive pin #2 common drive pin (-) (-) (+) 8762 8764 figure 6. signal reversal
3 portable and remote applications due to their small package size, light weight, low power consumption, and high reliability, these switches are ideal for your portable or remote applications. the light weight and repeatability make them well suited for portable spectrum analyzers and other portable microwave test equip- ment. their 1,000,000 cycle life make them the ideal candidate for system design, such as communications repeaters or remote monitoring sta- tions that demand minimal mainte- nance. the switchs automatic coil disconnect feature and low current drain during switching minimize the amount of power needed for operat- ing the switches. dedicated switching for larger switching systems, where many switches will be used to provide complex signal routing, a switch driv- er such as the 87130a or 70611a is recommended. the 87130a rack-and- stack switch driver and the mms- based 70611a are convenient, flexible interface bus (gpib) or modular sys- tems interface bus (ms-ib) switch controllers, providing driver circuitry, indicator readback circuitry and firmware that makes it easy to integrate switch components into a switching system. controlling the 87130a is simple using either a pc or workstation based gpib controller and agilent interactive test generator (agilent-itg) or agilent visual engineering environment (agilent vee). the 70611a gives manual control via the mms user interface or can also be controlled via an gpib equipped pc or workstation. in addition, the built-in firmware makes it possible to define often used switch paths. with the path com- mand, macros can be designed which open and close the right solenoids to select the desired switch port, and the path may be given a meaningful name. remember that only one select pin should be activated at one time to prevent rapid cycling of the switch. both the 87130a and 70611a provide position monitoring and reporting, which make it possible for a program to determine if all the switches are in their proper state (position) before the program continues with testing. a programmable wake up condition makes it possible to ensure that the matrix or switching system starts up in a predetermined state, to prevent damage to delicate equipment from excessive power. this would also be the state that the system returns to after a power interruption. accessory cables and adapters make it easy to quickly get the 8762/3/4 working with the 87130a or 70611a. reference literature number 5963- 2038e, switch attenuator driver configuration guide . for smaller switching needs, the 11713a attenuator/switch controller provides simple gpib control for up to ten 8762/3/4 switches. connecting cables can be ordered which make it easy to connect the switches to the 11713a.
4 operation and use how the switch works all the switches are break before make; the switched ports are not connected to each other preventing possible damage to sensitive circuits. the standard configuration switch uses 24 vdc for the switching voltage, option 876xx-011 1 specifies a voltage of 5 vdc, and option 876xx-015 speci- fies 15 vdc. options 876xx-t15 and 876xx-t24 are ttl/5v cmos compati- ble with 15 vdc and 24 vdc drive respectively. driving the switch for standard, options 87 6xx- 011 and 876xx- 015 switches, switching is accomplished by applying the supply voltage to pin c and grounding the 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 87 6xx- 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. remote indication (ttl options excluded) the position of the switch may be determined by utilizing the open and closed states of the internal coil con- tacts. figure 7 displays two indicator circuits, one to provide a ttl output and one that directly activates an led. the circuits will output a ttl hi and led on if the switch is in the state shown in figure 7. when drive pin 1 contact is closed (as shown), rf port 2 is connected to common port. for the agilent 8763/4, see figures 2, 3, and table 1 for cor- responding rf port connections. the circuits shown are designed to oper- ate with coil voltage of 24 v. if other voltage switches are used, the circuit components must be modified to accommodate that voltage. since current is drawn through the solenoid for these indicator circuits, inadvertent switching is prevented by limiting the current to 5 ma. additional design information may be required from the component manufacturer for the circuits described in figure 7, depending upon specific applications. agilent technologies assumes no responsibility for use of any circuits described herein, and makes no repre- sentations or warranties, expressed or implied, that such circuits are free from patent infringements. figure 7. ttl and led remote indicator circuits 1. where xx = 2a, 3a, 4a, 2b, 3b, 4b, 2c, 3c, or 4c.
standard drive ttl drive 1 model number pin 1 pin 2 pin 2 2 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 5 high low absolute max input minimum on state maximum off state 7.0v 3.0v 0.4v 0.0v table 1. switching logic table figure 8. control voltage states 1. pin 1 is always at ground. 2. see figure 8 for control voltage states.
6 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 ?) general operating data maximum power rating 1 watt average; 100 watts peak (not to exceed average power rating); +7 vdc life 1,000,000 cycles minimum switching solenoid switching speed 30 ms maximum switch drive data parameter test conditions minimum nominal maximum units supply voltage option 876xx-024 or 876xx-t24 20 24 32 v options 876xx-015/876xx-t15 12 15 20 v option 876xx-011 4.5 5 7 v supply current switching; pulse width 30 ms maximum option 876xx-024 or 876xx-t24 @ vcc = 24 vdc 120 ma option 876xx-015/876xx-t15 @ vcc = 15 vdc 182 ma option 876xx-011 @ vcc = 5 vdc 400 ma impedance option 876xx-024 or 876xx-t24 200 ohm 127 mh option 876xx-015, option 876xx-t15 82 ohm 57 mh option 876xx-011 13 ohm 8mh options 876xx-t15 and 876xx-t24 high-level input 3 v low-level input 0.4 v max high input current vcc = max 300 ? v input = 7.0 vdc supply current (quiescent) v input = 0.0 2.0 ma v input = 7.0 50 ?
7 environmental operating humidity vibration shock temperature 95% rh, 40 ?, 0.05? 50 g's, ?5 to +75 ? 5 days 10 to 55 hz 3 ms physical specifications dimensions: per figure 9 weight: 245 g (9 oz.) dimensions in millimeters and (inches) figure 9. product outlines
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