2022-09-09 09:51 Status: Tags: # Switched Filter Networks ## Intro Signal is switched between two networks, one phase shifted and the other clean through. [^1] Less loss than the [high-pass and low-pass phase shifter](high-pass%20and%20low-pass%20phase%20shifter.md) because it doesn't require back to back switches. [^microwaves101] Useful for up to 90 degrees, then can be casacaded to get 180 degrees - this would be larger than an equivalent [high-pass and low-pass phase shifter](high-pass%20and%20low-pass%20phase%20shifter.md) or [autotransformer](autotransformer.md) implementation. Can work at mmWave. The FET used for switching can be used as the high pass capacitor.  Note: L2 is used to [resonate](parallel%20resonance.md) the off-capacitance of Q2 to act as a near-perfect open circuit.  ## Implementation in [GaAs](GaAs.md) An example implementation of a switched network can be seen pictured below: ^[[Microwaves101 | MMIC Phase Shifter Example 2](https://www.microwaves101.com/encyclopedias/mmic-phase-shifter-example-2)] This makes use of phase bits introduced in [A Compact 5-bit Phase-Shifter MMIC for K-band Satellite Communication Systems](../../Spaces/Career/Companies/Millibeam/notes/A%20Compact%205-bit%20Phase-Shifter%20MMIC%20for%20K-band%20Satellite%20Communication%20Systems.md) --- # References [Robabeh's Thesis](High%20Resolution%20Integrated%20Passive%20Phase%20Shifters%20for%20Future%20Wireless%20Communications.md#5%202%205%20Switched%20Networks) [^microwaves101]: [Microwaves101 | Switched Filter Phase Shifters](https://www.microwaves101.com/encyclopedias/switched-filter-phase-shifters)