| 摘要 |
An oversampling converter includes integrators and differentiators. The output of an integrator in the second stage of the oversampling converter is sent to the analog differentiator to produce a differentiated signal. The differentiated signal is then sent back to the input of the integrator in the first stage of the oversampling converter. The output code of this stage and its derivative and the output of the previous input stage are added by using a digital method, and then the equivalent code is sent to a control voltage reference by using a switched-capacitor method. The voltage produced by the switched-capacitor method is equal to the equivalent code and is sent to the input of the integrator in this stage. The input stage is a first order oversampling converter. The output of the integrator in the input stage is sent to the input of the next stage. The output codes of the two stages will produce high resolution output by digital calculations. The advantages of this method are the higher operation frequency and lower quantization noise of this oversampling converter.
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