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PVT tolerant LC-VCO in 90 nm CMOS technology for GPS/Galileo applications

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3 Author(s)
Siwiec, K. ; Inst. of Microelectron. & Optoelectron., Warsaw Univ. of Technol., Warsaw, Poland ; Borejko, T. ; Pleskacz, W.A.

In this paper low-voltage LC voltage-controlled oscillator (VCO) with low sensitivity to process, voltage and temperature (PVT) variations has been presented. VCO operates at 3.2 GHz and its output signal frequency is divided by 2 in quadrature divider to generate quadrature signals at 1.6 GHz. The NMOS cross-coupled architecture, proper varactor biasing, tuning curve linearization technique and switched-capacitor (SC) current source were used to reduce the sensitivity to PVT variations. The LC-VCO was designed with the usage of Low-Leakage UMC 90 nm CMOS technology. It achieves phase noise of -117 dBc/Hz at 1 MHz offset and draws 1.2 mA (VCO+Quadrature Divider) from 1.2 V supply voltage.

Published in:

Design and Diagnostics of Electronic Circuits & Systems (DDECS), 2011 IEEE 14th International Symposium on

Date of Conference:

13-15 April 2011