Application Notes for RF Switches
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SPECIAL ORDER PRODUCT
– CONSULT FACTORY BEFORE ORDERING – |
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The H91 Series consist of a family of high-speed and high-isolation hermetically sealed switches with integrated drivers that operate over the frequency range from 1 to 18 GHz.
The H91 Series switches are equipped with removable SMA female RF connectors permitting field replaceability or integration as drop-in modules. Package area and volume are minimized and overall thickness, with the built-in driver, is only 0.24”.
The H91 family consists of SPDT and SP4T switches in both reflective and non-reflective configurations.
On all switches, the dc and control ports are located in line on one wall of the module above the RF connection level. This makes the switches ideally suitable for printed-circuit type mounting.
REFLECTIVE MULTI-THROW SWITCHES
All models in this group use an integrated assembly of PIN diodes mounted in a microstrip transmission line in a series-shunt arrangement as shown in Fig.1.
When positive current is applied by the driver, the associated port is Off since the corresponding shunt diodes are biased to a low resistance and the series diode to a high resistance. With negative current, the converse conditions are established and the port is ON.
NON REFLECTIVE MULTI-THROW SWITCHES
The circuit arrangements for this series is shown in Figure 2.
When positive current is applied the port is turned OFF. All the series diodes in that port are reverse-biased and the impedance at the output of the port is then effectively that of the 50-ohm resistor.
SWITCHING SPEED
SWITCHING SPEED
All models exhibit transition times of less than 10 nanoseconds between 10% to 90% and 90% to 10% of the RF power.
ON time, the time from 50% point of the TTL command to the 90% level of the detected RF, is less than 25 nanoseconds for all models; OFF time, from the 50% point of the TTL command to the 10% level of the detected RF, is less than 20 nanoseconds.
HERMETIC SEALING
All switches are housed in enclosures using sealed glass-to-metal “feedthru” connectors for true hermeticity.
Model H9114 Hermetically Sealed SPST Switch
| MODEL NO. | CHARACTERISTIC | FREQUENCY (GHz) | ||||
| 1.0 – 2.0 | 2.0 – 4.0 | 4.0 – 8.0 | 8.0 – 12.4 | 12.4 – 18.0 | ||
| H9114 | Min Isolation (dB) | 60 | 74 | 80 | 80 | 80 |
| Max Insertion Loss (dB) | 0.9 | 0.9 | 1.2 | 1.6 | 2.5 | |
| Max VSWR (On position) | 1.4 | 1.4 | 1.75 | 1.75 | 2.0 | |
Models H9120H and H9120HT Hermetically Sealed SPDT Switches
| FREQUENCY (GHz) | |||||
| MODEL NO. | CHARACTERISTIC | 1—4 | 4—8 | 8—12.4 | 12.4—18 |
| H9120H |
Min. Isolation (dB)
Max Insertion Loss (dB). Max VSWR (ON)
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60 1.1 1.75 |
60 1.4 1.75 |
60 2.0 1.75 |
50 2.5 2.0 |
| H9120HT |
Min. Isolation (dB)
Max Insertion Loss (dB) Max VSWR ON Max VSWR Port OFF |
60 1.3 1.75 1.75 |
60 1.7 1.9 2.0 |
60 2.5 2.0 2.2 |
50 3.0 2.0 2.3 |
DIMENSIONS AND WEIGHTS
Models H9140H and H9140HT Hermetically Sealed SP4T Switches
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| FREQUENCY (GHz) | |||||
| MODEL NO. | CHARACTERISTIC | 1—4 | 4—8 | 8—12.4 | 12.4—18 |
| H9140H |
Min Isolation (dB)
Max Insertion Loss (dB) Max VSWR (ON)
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60 1.4 1.75 |
60 1.5 1.75 |
60 2.0 1.75 |
50 2.8 2.0 |
| H9140HT |
Min Isolation (dB)
Max Insertion Loss (dB) Max VSWR On Max VSWR Port Off |
60 1.6 1.75 1.75 |
60 1.8 1.9 2.0 |
60 2.5 2.0 2.2 |
50 3.3 2.0 2.3 |
DIMENSIONS AND WEIGHTS
PERFORMANCE CHARACTERISTICS
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