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Low-voltage CMOS transconductor-C filter design using charge-pump circuit

Tajalli, A ; Sharif University of Technology | 2005

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  1. Type of Document: Article
  2. DOI: 10.1007/s10470-005-3005-z
  3. Publisher: 2005
  4. Abstract:
  5. A very low voltage transconductor for video frequency range applications and compatible with standard CMOS technology is described. In the proposed transconductor, except the DC level shifter circuit (DCLS), the whole transconductor uses the main supply voltage [which can be as low as 1.5 V in a standard 0.6 μm CMOS technology] while the DCLS uses a simple charge-pump circuit as its supply voltage and has a very low current consumption. In addition, proper common-mode sense and charge-pump circuits are developed for this low-voltage application. Meanwhile, some techniques to improve the frequency response, linearity, and noise performance of the proposed transconductor are described. In a standard 0.6 μm CMOS technology and single 1.5 V supply, simulations show that the proposed transconductor futures a THD of -50 dB for 1.4 V pp and 10 MHz input signal and -60 dB for 1.4 V pp and 1 MHz signal where the threshold voltage of MOS transistors could be as high as 1 V. Based on the proposed transconductor, a lowpass filter with 700 kHz to 8 MHz programmable cutoff frequency and a bandpass 10.7 MHz second order filter were implemented. © 2005 Springer Science + Business Media, Inc
  6. Keywords:
  7. Charge pump circuit ; DC level shifter ; G m-C filter ; Low voltage transconductor ; Voltage doubler ; Bandpass filters ; Computer simulation ; Electric charge ; Frequencies ; MOSFET devices ; Voltage measurement ; CMOS integrated circuits
  8. Source: Analog Integrated Circuits and Signal Processing ; Volume 44, Issue 3 , 2005 , Pages 219-229 ; 09251030 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s10470-005-3005-z?noAccess=true