Frequency Tuning and Spurious Signal Generation at Microwave Frequencies in Ferroelectric Thin-film Transmission Lines

Published

February 14, 2007

Author(s)

Jordi Mateu, James Booth, S. A. Schima

Abstract

This work evaluates the RF tuning and the microwave nonlinear response of SrTiO₃u thin-films by measuring the third harmonic and third order intermodulation proucts of several coplanar transmission lines. From these measurements, we obtain the distributed nonlinear capacitance per unit lenght as a function of RF bias voltage, C(V_rfu) using an accurate equivalent circuit to model the spurious signal generation. A unique value of C(V_rfu) is used to described the third harmonic generation, 3f₁u and 3f₂u, and the third order intermodulation products at 2f₁+f_{2 and 2f}d2+f₁u frequencies, in a time scale range from hundreds of picoseconds to milliseconds. We compare C(V_du) and obtain excellent agreement for 50K and 76K temperatures. From this result we interpret that equal tunability can be achieved from DC to nanosecond time scales, and that some of the spurious signals generated in STO ferroelectric transmission lines can be predicted directly from bias measurements.

Volume

55

Issue

2

Conference Dates

June 11-16, 2006

Conference Location

San Francisco, CA, USA

Conference Title

IEEE MTT-S International Microwave Symposium

Pub Type

Conferences

Keywords

ferroelectric transmission lines, Rf tuning, thin films

Citation

Mateu, J. , Booth, J. and Schima, S. (2007), Frequency Tuning and Spurious Signal Generation at Microwave Frequencies in Ferroelectric Thin-film Transmission Lines, IEEE MTT-S International Microwave Symposium, San Francisco, CA, USA (Accessed June 6, 2025)