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A high dynamic range CMOS variable gain filter for ADSL

Mehrmanesh, S ; Sharif University of Technology | 2002

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  1. Type of Document: Article
  2. Publisher: 2002
  3. Abstract:
  4. A 3rd order, 1.1 MHz, lowpass butterworth Gm-c filter has been combined with a low noise Variable Gain Amplifier to form the Variable Gain Filter (VGF). In this VGF an improved transconductor is used and a new method is used to adjust the transconductance gain for tuning application. A continuous variable gain current-to-current converter is used to tune the transconductor value. The THD of the VGF is -85 dB for 1 Vppd input signal and -50 dB for 3 Vppd input signal. VGF gain can be varied from 0 to 31 dB with 1 dB variation steps. Input referred noise is 20 nV/√Hz for maximum gain. All the circuits are designed based on a 0.25 μm CMOS process technology
  5. Keywords:
  6. Dynamic range ; Circuit topology ; Noise figure ; Transconductance ; Resistors ; Voltage ; Circuit noise ; Transconductors ; Filters ; Gain
  7. Source: 2002 IEEE International Symposium on Circuits and Systems, Phoenix, AZ, 26 May 2002 through 29 May 2002 ; Volume 4 , 2002 , Pages IV/257-IV/260 ; 02714310 (ISSN)
  8. URL: https://ieeexplore.ieee.org/document/1010439