A 0.5-6 MHz Active-RC LPF with Fine Gain Steps Using Binary Interpolated Resistor Banks

作者：Beck Sungho^*; Jeong Seongheon; Min Sunki; Hwang Myung Woon; Kim Stephen T; Lim Kyutae; Tentzeris Emmanouil M

来源：IEICE - Transactions on Electronics, 2011, E94C(8): 1328-1331.

DOI：10.1587/transele.E94.C.1328

• active filters
• variable-gain amplifiers
• calibration
• receivers

This paper proposes an active-RC filter that achieves a wide pseudo-continuous bandwidth-tuning range and a wide gain range with fine steps using a novel switched resistor architecture. A channel-selection filter with the proposed resistor bank is designed for a multi-mode mobile-TV receiver with the 6th order Chebyshev-I topology. The bandwidth, 0.5-6 MHz with 5% steps, supports multiple mobile-TV standards with sufficient margins for process and temperature variations. The filter also accomplishes a 30-dB variable gain range with 6-dB steps, and it relaxes the dynamic range requirement of a succeeding programmable gain amplifier. The power consumption of the filter, 3.4-5.0 mW, is adjustable according to the bandwidth and the signal level. The filter was fabricated with on-chip bandwidth-calibration circuitry in 0.18-mu m CMOS and occupied 0.81 mm(2).

• 出版日期2011-8