Design of fully digital inductors for low bandwidth filter applications

We are currently living in the age of intelligent machines, where we are interested in acquiring data and making decisions all from some sort of embedded environment. Of particular value are personal health metrics, such as the analysis of heart rate, muscle action potentials, and brain waves. Collecting this data requires new advances in the circuitry behind much of classical filter design. In this thesis, we present a digital inductor based on time-domain signal processing. This approach uses the phase-domain theory that is well-known and understood in the fields of clocking and serial links and applies it to analog circuit design. By using a ring oscillator to integrate the input voltage and a switched transconductor to inject current into the input node, the proposed time-domain gyrator achieves inductive input impedance without using either large resistors or capacitors. Realizing the gyrator in this manner makes it significantly more amenable for technology scaling. Fabricated in 65 nm CMOS process, the inductor operates from a 0.7 V supply voltage and consumes 528 μW. Measurement results show inductance values in the range of 150 μH to 1.5 mH can be achieved.

Name thesis:degree_name

M.S.

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Electrical & Computer Engr

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2017

Author dc:creator

• Salz, Braedon Lenox

Contributors dc:contributor

• Hanumolu, Pavan K.

• Inductor
• Phase-domain
• Time-domain signal processing

Statement dc:rights

• This thesis is beerware licensed: As long as you retain this notice you can do whatever you want with this stuff. If we meet some day, and you think this stuff is worth it, you can buy me a beer in return.

Language dc:language

en

Handle dc:identifier

http://hdl.handle.net/2142/98402

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/98402