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Body-Driven Enhanced-Impedance Current Source: An Approach to the Implementation of Low-Voltage Current-Steering D/A Converters | IEEE Conference Publication | IEEE Xplore

Body-Driven Enhanced-Impedance Current Source: An Approach to the Implementation of Low-Voltage Current-Steering D/A Converters


Abstract:

Regular Current-Steering D/A Converters (CS-DACs) using high-swing cascode current-source structures fail to operate with very-low supply voltages. In this paper, body- d...Show More

Abstract:

Regular Current-Steering D/A Converters (CS-DACs) using high-swing cascode current-source structures fail to operate with very-low supply voltages. In this paper, body- driven enhanced-impedance current cells have been employed to satisfy required characteristics of CS-DAC in low headroom voltage. In this technique, a body-driven amplifier increases the output impedance of a cascode current source without degrading its high-frequency behavior. A 1-V 10- bit 100 MHz CS-DAC using the proposed current source structure has been designed and simulated in a 0.18 mum CMOS technology. Monte-Carlo simulations show that the probability of Spurious Free Dynamic Range (SFDR) of more than 60 dB is more than 90% for input frequencies up to Nyquist frequency, which confirms the proper operation of the converter in very low supply voltages.
Date of Conference: 11-14 December 2007
Date Added to IEEE Xplore: 07 May 2008
ISBN Information:
Conference Location: Marrakech, Morocco

References

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