A 2-V 2-GHz Si-bipolar direct-conversion quadrature modulator

A 2-GHz Si-bipolar direct-conversion quadrature modulator with a wide bandwidth is described. It operates at a low supply-voltage of 2 V and features a "current-folded" double-balanced mixer with a two-stacked-transistor configuration, and a tunable RC/CR 90/spl deg/ phase shifter that red...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits 1996-02, Vol.31 (2), p.263-267
Main Authors: Tsukahara, T., Ishikawa, M., Muraguchi, M.
Format: Article
Language:English
Subjects:
Bandwidth
Frequency modulation
Large scale integration
Monolithic integrated circuits
Phase modulation
Phase shifters
Radio frequency
Radiofrequency integrated circuits
Tunable circuits and devices
Voltage
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Description
Summary:A 2-GHz Si-bipolar direct-conversion quadrature modulator with a wide bandwidth is described. It operates at a low supply-voltage of 2 V and features a "current-folded" double-balanced mixer with a two-stacked-transistor configuration, and a tunable RC/CR 90/spl deg/ phase shifter that reduces the amplitude imbalance and the phase error over a wide bandwidth (0.8 to 2 GHz). The modulator is implemented using 18-GHz Si-bipolar technology and dissipates only 68 mW at 2 V. The image ratio at 2 GHz is about -37 dBc, corresponding to a phase error of 1.6/spl deg/. Moreover, both second-order and third-order products, and local signal leakage are less than -40 dBc.
ISSN:0018-9200
1558-173X
DOI:10.1109/4.488005