技术资料.pdf - 第21页

21 34946A/47 A Option 001 These m odules can also be ordered without s witches instal led. This gives you the capab ility to install your own N181 0 series s witches or use th e modu le to con trol the N 1810 S eries sw …

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Figure 9. 34941A typical initial crosstalk
Figure 10. 34941A typical initial insertion loss
Figure 11. 34941A typical initial VSWR
Figure 12. 34942A typical initial crosstalk
34946A/47A—From DC to 26.5 GHz
For applications where you need only a few high-frequency switches, the 34946A and 34947A offer ingle-
pole, double-throw switches in either 4GHz, 20GHz or 26.5GHz options. These modules internally mount
two or three independent Keysight N1810 series coaxial switches. These switches are well known for
their excellent insertion loss, isolation, and VSWR specifications.
Switch read-back capabilities allow you to query the position of the switch. You can choose higher density
with the unterminated switches or select the terminated switches to maintain an impedance match.
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34946A/47A Option 001
These modules can also be ordered without switches installed. This gives you the capability to install your
own N1810 series switches or use the module to control the N1810 Series switches outside the
mainframe.
Figure 13. 34942A typical initial VSWR
Figure 14. 34942 typical initial insertion loss
N1810 minimum required switch options
Option
Comment
Coil Voltage
option 124
24 VDC coil
DC Connector
option 201
D” subminiature 9 pin female
Drive
option 402
Position indicators
Figure 15. 34946A Dual 1x2 SPDT terminated microwave switch
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DC to 3 GHz
DC to 26.5 GHz
3
34941A
34942A
34946A
34947A
Channels
quad 1x4
quad 1x4
2 SPDT
3 SPDT
Switch Type
50 Ω unterminated,
latching relays
75 Ω unterminated,
latching relays
50 Ω terminated 50 Ω unterminated
RF characteristics
Frequency range
2
DC to 3 GHz DC to 1.5 GHz
DC to 4 GHz,
20 GHz or 26.5 GHz
DC to 4 GHz,
20 GHz or 26.5 GHz
Insertion loss
2
< 40C/80% RH)
100 MHz
1 GHz
3 GHz
0.15 dB
0.60 dB
1.40 dB
0.15 dB
0.60 dB
N/A
DC to 4 GHz < 0.42 dB,
@ 20 GHz < 0.69 dB,
@ 26.5 GHz < 0.8 dB
DC to 4 GHz < 0.42 dB,
@ 20 GHz < 0.69 dB,
@ 26.5 GHz < 0.8 dB
VSWR
100 MHz
1 GHz
3 GHz
1.03
1.25
1.55
1.15
1.35
N/A
DC to 4 GHz < 1.15,
@ 20 GHz < 1.30,
@ 26.5GHz < 1.6
DC to 4 GHz < 1.15,
@ 20 GHz < 1.30,
@ 26.5GHz < 1.6
Isolation (dB)
2
100 MHz
1 GHz
3 GHz
Contact factory
80 dB
58 dB
40 dB
Contact factory
80 dB
60 dB
N/A
DC to 4 GHz > 85 dB,
@ 20 GHz > 67 dB,
@ 26.5 GHz > 60 dB
DC to 4 GHz > 85 dB, @
20 GHz > 67 dB,
@ 26.5 GHz > 60 dB
Spurious noise below 1.3 GHz
-140 dBm
-140 dBm
80 dB
80 dB
Rise time
< 80 ps
< 160 ps
N/A
N/A
Signal delay
< 1 ns
< 1 ns
N/A
N/A
Capacitance
< 30 pF
< 30 pF
N/A
N/A
Switching characteristics
Max volts
1
30 V
30 V
7 VDC
7 VDC
Max current
0.5 A
0.5 A
N/A
N/A
Max power
10 W
5
10 W
5
1 W@7 VDC,50 W peak
4
1 W@7 VDC,50 W peak
4
Offset voltage
10 µV
10 µV
N/A
N/A
Initial channel resistance
6
1 Ω
1 Ω
N/A
N/A
Volt-Hertz limit
2 x 10
10
2 x 10
10
General characteristics
Relay life
300,000 at 30 V/10 mA
load; 100,000 at 10 W
load RF SAmeas
300,000 at 30 V/10 mA
load; 100,000 at 10 W load
RF SAmeas
> 5 M cycles > 5 M cycles
Open/close time
18 ms/18 ms
18 ms/18 ms
< 15 ms/15 ms
< 15 ms/15 ms
Connector type
Female SMA
Mini 75 Ω SMB
Female SMA
Female SMA
Coil voltage
N/A
N/A
24 VDC
24 VDC
Analog bus backplane
connection
No No No No
Note:
1. Channel-to-earth
2. 50 Ω source, 50 Ω load (75 Ω for 34942A)
3. For more detailed switch specifications, see the Keysight N1810TL, N1811TL, N1812UL for 34946A, and N1810UL
for the 34947A.
4. 10 usec maximum duration
5. Max power is 1 W between 30 MHz and 1 GHz for CISPR 11 compliance
6. Channel resistance is typically < 1.5 Ω but can go as high as 50 Ω when a channel is used in measurement
applications with < 10 mA load current. Increased relay channel resistance for measurements with load currents
below 10 mA can occur on cards that have been out of service or following relay inactivity for periods of greater
than 1 week. Switching relays for 2K cycles prior to use may reduce the variation in channel resistance. Applies to
the 34941A and 34942A.