A new CMOS active transformer QPSK modulator with optimal bandwidth control

Adrian Tang; Fei Yuan; Eddie Law

doi:10.1109/TCSII.2007.909867

A new CMOS active transformer QPSK modulator with optimal bandwidth control

Adrian Tang, Fei Yuan, Eddie Law

Toronto Metropolitan University

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

This brief presents a new quadrature phase-shift keying (QPSK) modulator for Bluetooth applications with an optimal transaction bandwidth control. The modulator reduces the bandwidth of the modulated carrier by minimizing their transition sharpness. CMOS active transformers are developed and utilized in quadrature oscillator and multiplexer of the modulator to provide comparable phase noise performance without using spiral inductors and transformers. The performance of the modulator is assessed using a 1.6-GHz QPSK base-band modulator implemented in TSMC 0.18-μm 1.8-V CMOS technology and analyzed using SpectreRF from Cadence Design Systems with BSIM3v3 device models. The total transistor area and power consumption of the modulator are 2840 μm² and 30 mW, respectively. The phase noise of the quadrature oscillator is - 110 dBc/Hz at 500-kHz frequency offset.

Original language	English
Pages (from-to)	11-15
Number of pages	5
Journal	IEEE Transactions on Circuits and Systems II: Express Briefs
Volume	55
Issue number	1
DOIs	https://doi.org/10.1109/TCSII.2007.909867
Publication status	Published - 2008
Externally published	Yes

Keywords

Bandwidth
CMOS integrated circuits
Modulation
Oscillators
Phase noise
Phase shift keying
Windings

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10.1109/TCSII.2007.909867

Cite this

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A new CMOS active transformer QPSK modulator with optimal bandwidth control

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Keywords

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