A Reflection-Mode N -Path Filter Tunable From 6 to 31 GHz

A 6-to-31-GHz reflection-mode N -path filter is implemented in 45-nm SOI technology. The filter includes an on-chip hybrid coupler with through and coupled ports terminated with four-phase passive mixers. Each mixer provides a high impedance in-band and a matched, 50- \Omega impedance out-of-band...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits 2023-07, Vol.58 (7), p.1-14
Main Authors: Hari, Sandeep, Ellington, Cody J., Floyd, Brian A.
Format: Article
Language:English
Subjects:
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Bandpass
Bandpass filters
Bandwidths
Behavioral sciences
Broadband
Broadband communication
Circuits
Couplers
Frequency measurement
frequency selective
High impedance
Impedance
Impedance matching
Insertion loss
millimeter wave (mmWave)
Mixers
Narrowband
passive mixer
Receivers
reflection mode
Switches
transversal filter
tunable filter
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Summary:A 6-to-31-GHz reflection-mode N -path filter is implemented in 45-nm SOI technology. The filter includes an on-chip hybrid coupler with through and coupled ports terminated with four-phase passive mixers. Each mixer provides a high impedance in-band and a matched, 50- \Omega impedance out-of-band (OOB) that is provided by the on-resistance of the switches. As such, in-band signals are reflected by the mixers, and OOB signals are absorbed. This enables reflection-mode bandpass filtering of the signal, with the center frequency set by the local-oscillator frequency. To increase selectivity, an active baseband (BB) load with adjustable bandwidth can be enabled to provide a second-order capacitive response, which increases the roll-off to 12 dB/octave. Measurements show that the filter can be tuned across 6-31 GHz with a maximum 3-dB RF bandwidth of 0.47 GHz for the passive BB and either 0.22 or 1.22 GHz for the active BB in narrowband or wideband modes. Filter insertion loss (IL) is
ISSN:0018-9200
1558-173X
DOI:10.1109/JSSC.2023.3235976