A 2-V 2-GHz Si-bipolar direct-conversion quadrature modulator
- 1 January 1996
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Journal of Solid-State Circuits
- Vol. 31 (2) , 263-267
- https://doi.org/10.1109/4.488005
Abstract
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° 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°. Moreover, both second-order and third-order products, and local signal leakage are less than -40 dBcKeywords
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