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PhD Preliminary Oral Exam – Manoj Johnson

Frequency/Code-Domain Filtering N-path Filters; A 4-element 28GHz Millimeter-wave MIMO Array with Single-wire Interface

Applying orthogonal sequences to N-path filters promises reconfigurable select/reject filtering of signals based on their spatial, spectral and code-domain properties. Achieving code and frequency-domain notch filtering using inductors instead of capacitors has been challenging due to parasitics and self-resonance associated with large off-chip inductors. In this work, N-path frequency/code-domain reject and select filtering is demonstrated using N-path switching with passive inductors. A cascaded inductor approach and differential N-path filtering is used to overcome inductor parasitics and enable GHz operation. A 65-nm CMOS prototype of a code-domain notch filter followed by a code-domain select receiver demonstrates 0.5GHz to 1.0GHz operation with 26dB blocker filtering with 8dBm power handling, while consuming 60mW (at 1GHz LO) and occupying 1.2mm2 of die area. Millimeter-wave MIMO systems with digitization of every element enable spatial multiplexing, virtual arrays for radar, digital beamforming (DBF) for high mobility scenarios. However, per-element digitization results in a formidable I/O challenge in large-scale tiled MIMO mmWave arrays. This work demonstrates a 28GHz 4-element MIMO RX with a single-wire interface that multiplexes the baseband signals of all elements and the LO reference through code-domain multiplexing. System considerations are presented and the approach is validated through DBF after de-multiplexing of the baseband signals from the single wire. Each element in the array achieves 16dB conversion gain and ∼7dB NF while consuming 60mA from 1.2V. The IC occupies 5.75mm2 in 65-nm CMOS.

Major Advisor: Arun Natarajan
Committee: Un-Ku Moon
Committee: Andreas Weisshaar
Committee: Huaping Liu
GCR: Joseph Louis

Friday, March 13 at 3:00pm to 5:00pm

Kelley Engineering Center, 1005
110 SW Park Terrace, Corvallis, OR 97331

Event Type

Lecture or Presentation

Event Topic

Research

Organization
Electrical Engineering and Computer Science
Contact Name

Calvin Hughes

Contact Email

calvin.hughes@oregonstate.edu

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