| Summary: | 碩士 === 中原大學 === 電子工程研究所 === 96 === Abstract
The goals of circuit design are accurate output signals and the low cost. To reach the goals, we can find that using the least active components, resistors, capacitors and let the components as far as possible grounded will make the output be accurate. On the other hand, in order to cost down, the counts of components used in the circuit should be the least. Besides, the advantages of reduced components are the low power consumption, the less noise of circuits made, the less parasitic effect and the small chip area. According to the above goals, this paper expects to design filters with the minimum active and passive components.
In this paper, a new current-mode universal biquadratic filter employing a single differential voltage current conveyor, two grounded capacitors, and two floating resistors is presented. The circuit can realize the function of universal filter (namely, low-pass, band-pass, high-pass, band-reject, and all-pass) with the minimum active and passive components. Compare with the expectation, we can find that this circuit conforms to the low power consumption, the less noise and the small chip area. Although the parasitic effect caused by the parasitic conductance is not the least, the accuracy of the output still maintains the high level because of the minimum components used in the circuit. Moreover, the cost of this circuit is down, the circuit conforms to the current of the circuit design.
The simulation of this paper uses H-spice with TSMC035 process to obtain the results. From the simulation results, it can verify that the circuit enjoys the following advantages: (i) high filter performance (ii) wide frequency range (iii) low sensitivity. This paper also considers the non-ideal effect, and proposes that using tuning method to improve this circuit. After tuning, the frequency error of this circuit is very small, so this method can improve the accuracy of the circuit.
Compared with the theoretical, the simulation results are close to the theoretical. The circuit would be beneficial to apply in the future.
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