A low power Gm–C filter with on-chip automatic tuning for a WLAN transceiver

Liu Silin; Ma Heping; Shi Yin

doi:10.1088/1674-4926/31/6/065008

J. Semicond. > 2010, Volume 31 > Issue 6 > 065008

SEMICONDUCTOR INTEGRATED CIRCUITS

A low power Gm–C filter with on-chip automatic tuning for a WLAN transceiver

Liu Silin, Ma Heping and Shi Yin

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DOI: 10.1088/1674-4926/31/6/065008

Abstract: A sixth-order Butterworth Gm-C low-pass filter (LPF) with a continuous tuning architecture has been implemented for a wireless LAN (WLAN) transceiver in 0.35 μm CMOS technology. An interior node scaling technique has been applied directly to the LPF to improve the dynamic range and the structure of the LPF has been optimized to reduce both the die size and the current consumption. Measurement results show that the filter has 77.5 dB dynamic range, 16.3 ns group delay variation, better than 3% cutoff frequency accuracy, and 0 dBm passband IIP3. The whole LPF with the tuning circuit dissipates only 1.42 mA (5 MHz cutoff frequency) or 2.81 mA (10 MHz cutoff frequency) from 2.85 V supply voltage, and only occupies 0.175 mm2 die size.

Key words: Gm-C filter, interior node scaling, frequency automatic tuning

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Liu Silin, Ma Heping, Shi Yin. A low power Gm–C filter with on-chip automatic tuning for a WLAN transceiver[J]. Journal of Semiconductors, 2010, 31(6): 065008. doi: 10.1088/1674-4926/31/6/065008

Liu S L, Ma H P, Shi Y. A low power Gm–C filter with on-chip automatic tuning for a WLAN transceiver[J]. J. Semicond., 2010, 31(6): 065008. doi: 10.1088/1674-4926/31/6/065008.

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Received: 18 August 2015 Revised: 19 January 2010 Online: Published: 01 June 2010

A sixth-order Butterworth Gm-C low-pass filter (LPF) with a continuous tuning architecture has been implemented for a wireless LAN (WLAN) transceiver in 0.35 μm CMOS technology. An interior node scaling technique has been applied directly to the LPF to improve the dynamic range and the structure of the LPF has been optimized to reduce both the die size and the current consumption. Measurement results show that the filter has 77.5 dB dynamic range, 16.3 ns group delay variation, better than 3% cutoff frequency accuracy, and 0 dBm passband IIP3. The whole LPF with the tuning circuit dissipates only 1.42 mA (5 MHz cutoff frequency) or 2.81 mA (10 MHz cutoff frequency) from 2.85 V supply voltage, and only occupies 0.175 mm2 die size.

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