passiveTier B
Isolator
Isolate amplifier noise from the readout resonator. Simpler alternative to circulator in some readout chain configurations.
What it does
2-port non-reciprocal device. Passes signals in one direction with low loss and attenuates reverse-travelling signals. Used interchangeably with a circulator+load in cryogenic readout chains. Simpler packaging than a circulator but slightly less flexible.
Where it goes
- Allowed stages
- 4K, MXC
- Preferred stages
- MXC
- Forbidden stages
- 300K, 50K
- Typical line types
- readoutOut
- Functionally similar to circulator in V1. Can be merged visually if only one non-reciprocal family is shown.
Typical specifications
| Isolation | > 18 dB |
| Insertion loss | < 0.5 dB |
| Bandwidth | 4 – 8 GHz |
Ports
- In (from sample)inreadoutOut50 Ω
- Out (to HEMT)outreadoutOut50 Ω
Physical envelope
38.1 × 24.6 × 10.2 mm
Inline cryogenic isolator envelope aligned to the compact 2-port OFHC module class, with a body around 22.3 × 24.6 × 10.2 mm excluding connectors.