Design of Universal Biquadratic Filters with a Single Second-Generation Current Controlled Conveyor

• Main Authors: tzu-hao huang, 黃子豪
• Other Authors: Chun-Ming Chang
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/91643325540301900726

碩士 === 中原大學 === 電機工程研究所 === 96 === In the past circuit to reach output signal accuracy, usually increase many element reduce the disadvantage in circuit original. This result cause the circuit become complex. The major problem of non-accuracy output signal is parasitic effect, it means that integrated circuit (IC) have parasitic capacitance and leak current in wire to wire. This thesis research is how to reduce parasitic effect to lowest. There are active element, capacitance and inductance in present integrated circuit, although inductance in integrated has be researched, but its speed can not approach reduction in IC process. Today is how to reduce the parasitic effect of resistance, capacitance and active element. If active element have two input, but the design circuit only need one input, it have no need for two input element. Chose small active element can reduce parasitic effect. If resistance floating, two terminal have parasitic effect, ground resistance have parasitic effect in one terminal, capacitance are the same. Chose ground capacitance and ground resistance with parasitic capacitance and parasitic resistance in the same terminal can reduce parasitic effect. It have parasitic effect in circuit terminal, so design in a few terminal can get low parasitic effect. According to above, using a few element to achieve output signal accurate is the goal in this thesis. In recent of years, using current conveyor design active filters have been attended and researched by international academician. In this is, design three input and one output universal active current-mode filter using second-generation current controlled conveyor (CCCII). This active element internal resistance, denoted by Rx, at the input terminal X can be varied by tuning its bias current. It can reduce area in integrated circuit implementation. In three input and one output, we propose a single second-generation current controlled conveyor (CCCII), two grounded capacitors, and one resistor design current-mode universal biquadratic filter in this paper. This circuit has achieved the five following important advantages: (i) no component matching conditions, (ii) using least capacitance and resistance in biquadratic circuit, (iii) grounded capacitors have lowest noise, (iv)can realize on low-pass, band-pass, high-pass, band-reject, and all-pass filters in the same structure, (v) very low active and passive element sensitivity, (vi) orthogonal control of and Q, (vii) lowest power consumption, (viii) lowest noise, (ix) lowest area in integrated circuit implementation, (x) have good cost down. Finally, the simulation results validate and the theory predictions of the proposed circuit are verified very well by using TSMC035 H-spice simulation with supply voltage ±1.65V.