具有自动调谐功能的2.7 V CMOS GSM/WCDMA连续时间滤波器

Proceedings of the IEEE 2001 Custom Integrated Circuits Conference (Cat. No.01CH37169) Pub Date : 2001-05-06 DOI:10.1109/CICC.2001.929713

S. Lindfors, Tuomas Hollman, T. Salo, K. Halonen

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引用次数: 6

摘要

实现了一种用于双模蜂窝电话的具有7步增益控制的5阶连续基带滤波器。为了降低噪声，采用了实极点级联和梯形滤波器实现复极点对。为了降低gsm模式下的功耗，运放大器的GBW可编程。通过将1位DAC与滤波器和数字调谐电路分别与ADC集成，便于拐角频率调谐。集成输入参考噪声为6.9 /spl mu/V和13.6 /spl mu/V，电路在GSM和wcdma模式下的功耗分别为13mw和21.8 mW。wcdma模式下IIP3为+ 25dbv。

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A 2.7 V CMOS GSM/WCDMA continuous-time filter with automatic tuning

A 5th-order continuous-time baseband filter with 7-step gain control for a dual-mode cellular phone was implemented. A cascade of a real pole and a ladder filter implementing the complex pole pairs was used for low noise. The GBW of the opamps was made programmable to reduce the power consumption in the GSM-mode. The corner frequency tuning was facilitated by integrating a 1-bit DAC with the filter and a digital tuning circuit separately with an ADC. The integrated input referred noise is 6.9 /spl mu/V and 13.6 /spl mu/V and the circuit consumes 13 mW and 21.8 mW in the GSM- and WCDMA-modes, respectively. The IIP3 is +25 dBV in the WCDMA-mode.

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Proceedings of the IEEE 2001 Custom Integrated Circuits Conference (Cat. No.01CH37169)

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