Gain calibration and feedforward automatic gain control for CMOS radio-frequency ICs

2003 Symposium on VLSI Circuits. Digest of Technical Papers (IEEE Cat. No.03CH37408) Pub Date : 2003-06-12 DOI:10.1109/VLSIC.2003.1221180

W. Hioe, K. Maio, T. Ooshima, Y. Shibahara, T. Doi

引用次数: 7

Abstract

Two circuits for improving the performance of a Bluetooth CMOS RFIC are described. A RF amplifier gain calibration circuit uses a dummy amplifier to calibrate voltage gain and output voltage swing. The dummy amplifier's and a target RF amplifier share the bias circuit, thereby allowing accurate RF gain control against temperature, bias and process variations. A 0.18 /spl mu/m CMOS calibration circuit achieved gain control within +/-0.5 dB. The second circuit, an interleafed multi-stage filter and IF amplifier for use in a low-IF receiver, has an AGC circuit with a novel feedforward control that allows rapid convergence of the amplifier gain. When applied to a Bluetooth signal, convergence was achieved within 5 /spl mu/s even in the worst case blocking signal condition.

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CMOS射频集成电路的增益校准和前馈自动增益控制

介绍了提高蓝牙CMOS RFIC性能的两种电路。一种射频放大器增益校准电路，使用假放大器来校准电压增益和输出电压摆幅。虚拟放大器和目标射频放大器共享偏置电路，从而允许精确的射频增益控制温度，偏置和工艺变化。一个0.18 /spl mu/m的CMOS校准电路实现了增益控制在+/-0.5 dB以内。第二个电路是用于低中频接收器的交错多级滤波器和中频放大器，具有具有新颖前馈控制的AGC电路，可实现放大器增益的快速收敛。当应用于蓝牙信号时，即使在最坏的阻塞信号条件下，也能在5 /spl mu/s内实现收敛。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2003 Symposium on VLSI Circuits. Digest of Technical Papers (IEEE Cat. No.03CH37408)

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