Q.
Many of the RF and Microwave SOI switches require dual voltage supplies (VDD and VSS). Which of these may be operated with only a single positive supply (VDD)?
A.
Certain switches from the SOI portfolio may be operated using only a single positive VDD supply, and with the VSS pin grounded.
Operating the switch in such a manner has minimal effects on the small signal performance (insertion loss, isolation and return loss). However, there may be differences in the large signal (linearity - compression, intermodulation distortion, and power handling) and transient response (switching speed and settling time).
As of Mar 2023, below table summarizes the RF CW power handling of dual supply SOI switches for single supply operation:
| Part Number | Dual Supply CW RF Power Handling (Vdd = +3.3V , Vss = -3.3V) |
Single Supply CW RF Power Handling (Vdd = +3.3V , Vss = 0V) |
|||
| Through | Terminated | Through | Terminated | ||
| Non-Reflective | HMC1118 | 35 dBm | 27 dBm | 27 dBm | 22 dBm |
| ADRF5019 | 35 dBm | 27 dBm | 27 dBm | 22 dBm | |
| ADRF5020 | 24 dBm | 24 dBm | 21 dBm | 21 dBm | |
| ADRF5021 | 24 dBm | 24 dBm | 21 dBm | 21 dBm | |
| ADRF5023 | 30 dBm | 24 dBm | 15 dBm | 10 dBm | |
| ADRF5026 | 24 dBm | 24 dBm | N/A | N/A | |
| ADRF5027 | 24 dBm | 24 dBm | N/A | N/A | |
| ADRF5040 | 33 dBm | 27 dBm | 28 dBm | 24 dBm | |
| ADRF5042 | 24 dBm | 24 dBm | N/A | N/A | |
| ADRF5043 | 24 dBm | 24 dBm | N/A | N/A | |
| ADRF5044 | 24 dBm | 24 dBm | N/A | N/A | |
| ADRF5045 | 24 dBm | 24 dBm | N/A | N/A | |
| ADRF5049 | 30 dBm | 18 dBm | 15 dBm | 10 dBm | |
| ADRF5050 | 33 dBm | 18 dBm | 22 dBm | 12 dBm | |
| Reflective | ADRF5024 | 27 dBm | 21 dBm | ||
| ADRF5025 | 27 dBm | 21 dBm | |||
| ADRF5046 | 27 dBm | N/A | |||
| ADRF5047 | 26 dBm | N/A | |||
| ADRF5144 | 40 dBm | 30 dBm | |||
Note:
- Please refer to the application note, AN-1440, for more details on single supply operation. This app note also contains single supply performance on the HMC1118.
- The ADRF5250 has an integrated negative voltage generator. User may choose to enable or disable the NVG. Please refer to the datasheet.
