A Current-mode Continuous-time Sigma-delta Modulator based on Translinear Loop Principle

In this paper, a new approach for design of a fully differential second order current mode continuous-time sigma-delta modulator is presented. For circuit implementation, square root domain (SRD) translinear loop based on floating-gate MOS transistors that operate in saturation region is employed. The modulator features, low supply voltage, low power consumption (8mW) and high dynamic range (55dB). Simulation results confirm that this design is suitable for data converters.

Authors:

• P. Jelodarian
• E. Farshidi

Keywords:

• Sigma-delta
• current-mode
• translinear loop
• geometric mean
• squarer/divider.

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