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数字滤波器在sigma-delta ADC芯片中占据了大部分芯片面积，该文提出了一种数字滤波器结构，这种结构滤波器采用一个控制单元和一个加法器取代了Hogenauer结构滤波器中差分器的多个加法器，从而减小数字电路的面积。一个采用这种结构的4阶的数字滤波器在CYCLONE II FPGA芯片中被实现，耗费的硬件资源比Hogenauer结构的滤波器减少近29%。
Sigma-Delta Voltage to Frequency Converter With Phase Modulation Possibility
Sigma-Delta Voltage Frequency Converter Phase Modulation Possibility
2009/7/28
Voltage to frequency converter (VFC) is an oscillator whose frequency is linearly proportional to control voltage. There are two common VFC architectures: the current steering multivibrator and the ch...
A New Approach to Design Low Power Continues-Time Sigma-Delta Modulators
Sigma-delta modulator Current-mode Nonlinear Transconductance
2009/1/30
This paper presents the design of a low power
second-order continuous-time sigma-delta modulator for low power
applications. The loop filter of this modulator has been implemented
based on the nonl...