| Summary: | 碩士 === 中原大學 === 電機工程研究所 === 98 === This brief presents a voltage-mode fourth-order elliptic filter, and reduces the parasitic effect to obtain accurate output signal as the goal, so we offer the Analytical Synthesis Method (ASM), using fourth-order elliptic transfer function to design the circuit, because it can reduce voltage node numbers, so the parasitic effects can be reduced. We offer the special component - Operational Trans-Resistance Amplifier (OTRA),because its input node is virtual ground, so it can reduce parasitic effects ,too. So far, this component is the only one have the excellent characteristic.
The circuit of this paper, since it offer ASM and OTRA to design circuit, hence it can reduce parasitic effect to achieve the design goal. The simulation of this paper uses H-Spice with TSMC035 process to obtain the results. From the simulation result and using Matlab to testify the theoretical predictions, we can observe the difference between theoretical parts and simulation parts. The simulation result have fourth-order elliptic filter characteristic, we can use sensitivity to tunning the component value,let the output become more accurate. Finally, we will use MOS to replace the resistance because the MOS is more easy to exact in IC fabrication.
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