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CMOS exponential-control variable gain amplifiers

CMOS exponential-control variable gain amplifiers

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  • Author(s): W. Liu 1 ; W. Liu 2 ; S.-K. Wei 3
    • View affiliations
    • Affiliations: 1: Department of Electrical Engineering and Graduate Institute of Electronics Engineering, National Taiwan University, Taipei, Republic of China
      2: Department of Electronic Engineering, Tung Nan Institute of Technology, Republic of China
      3: Department of Electronic Engineering, Tung Nan Institute of Technology, Taiwan, Republic of China
  • Source: Volume 151, Issue 2, April 2004, p. 83 – 86
    DOI:  10.1049/ip-cds:20040111 , Print ISSN 1350-2409, Online ISSN 1359-7000
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New CMOS exponential-control variable-gain amplifiers (VGAs) are presented. The control signal can be either current-mode or voltage-mode. Since no multiplier is needed in the proposed circuits, the proposed VGAs can be very compact. For the case of supply voltages VDD=∣VSS∣=1.5 V, the power dissipation is only 0.48 mW. The gain control range of the proposed VGA can be 30 dB. The proposed circuits have been fabricated in a 0.5 μm n-well CMOS process. Experimental results are given to confirm the feasibility of the proposed VGAs, which are expected to be useful in analogue signal processing applications.

Inspec keywords: automatic gain control; amplifiers; CMOS analogue integrated circuits

Other keywords: CMOS exponential control variable gain amplifiers; current-mode control signal; power dissipation; n-well CMOS process; 0.5 micron; 1.5 V; gain control range; 0.48 mW; voltage-mode control signal

Subjects: Analogue circuit design, modelling and testing; CMOS integrated circuits; Amplifiers

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