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Novel differential inductor design for high self-resonance frequency

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3 Author(s)
Findley, P. ; RF Micro Devices, San Jose, CA, USA ; Rezvani, G.A. ; Jon Tao

Symmetric inductors which exhibit constructive inductive coupling between inter-twined halves (branches) under differential drive (i.e., differential inductors) are widely used in differential circuits in place of two separate, single-ended inductors when high Q is required and/or when space is at a premium. One disadvantage of such a differential inductor is the strong capacitive coupling between the two branches causing a low self-resonance frequency (FSR) when compared to two separate, nominally uncoupled inductors for the same application. This paper presents a novel layout design for differential inductors that largely mitigates this effect, thus extending the usable frequency range.

Published in:

Electron Devices Meeting, 2004. IEDM Technical Digest. IEEE International

Date of Conference:

13-15 Dec. 2004