| 摘要 |
PROBLEM TO BE SOLVED: To provide a complex type sigma-delta analog to digital conversion unit capable of reducing the quantization noise and converting input signals having a positive and negative frequency into a digital format from an analog format. SOLUTION: The complex type sigma-delta analog to digital conversion unit is provided, which includes: a first subtractor (111a); a first filter (112a); a first analog to digital converter (113a); a first digital to analog converter (114a); a first sign controller (115a); a second subtractor (111b); a second filter (112b); a second analog to digital converter (113b); a second digital to analog converter (114b); and a second sign controller (115b), wherein the first sign controller (115a) inverts a positive/negative sign of an output signal of the first filter in response to a control signal and outputs it to the second filter, and the second sign controller (115b) inverts a positive/negative sign of an output signal of the second filter in response to the control signal and outputs it to the first filter. COPYRIGHT: (C)2007,JPO&INPIT
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