Broadband variable passive delay elements based on an inductance multiplication technique

A new technique for making broadband and variable passive delay elements is described. By introducing a variable inductance structure and using it along with available varactors, synthesized transmission lines are implemented with variable delay while maintaining a constant Z o over the line bandwid...

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Bibliographic Details
Main Authors: Adabi, E., Niknejad, A.M.
Format: Conference Proceeding
Language:English
Subjects:
Array signal processing
Bandwidth
Capacitance
Capacitors
Delay lines
Inductance
inductance multiplication
inductance tuning
Inductors
passive delay element
Phase shifter
synthesized transmission lines
Transmission lines
Tunable circuits and devices
Varactors
variable delay
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Description
Summary:A new technique for making broadband and variable passive delay elements is described. By introducing a variable inductance structure and using it along with available varactors, synthesized transmission lines are implemented with variable delay while maintaining a constant Z o over the line bandwidth. Inductance tuning is realized through the effect of mutual inductance. As a demonstration prototype, a single unit cell and two cascaded unit cells were implemented in 90 nm digital CMOS process. Delay values ranging from 14 ps - 40 ps were obtained from DC to 8 GHz while maintaining matched condition over the bandwidth with delay variations of less than plusmn%5. These delay cells could be used in broadband impulse-based beamforming systems to provide variable delays in each RF path.
ISSN:1529-2517
2375-0995
DOI:10.1109/RFIC.2008.4561473