通過(guò)合理選擇濾波器的類(lèi)型和階數(shù)，利用低Q值二級(jí)濾波器放在高Q值二級(jí)濾波器的前級(jí)，給每一級(jí)分配不同的增益使得每一級(jí)的輸出峰值相同。從開(kāi)關(guān)電容電路的原理入手，分析了開(kāi)關(guān)電容電路和電容編程陣列，最終設(shè)計(jì)一個(gè)可編程開(kāi)關(guān)電容6階帶通濾波器。選擇合適的運(yùn)算放大器參數(shù)。可編程濾波器系統(tǒng)共需3路時(shí)鐘控制，濾波器編程參數(shù)控制模塊用于實(shí)現(xiàn)芯片內(nèi)部程序存儲(chǔ)器編程控制。通過(guò)對(duì)設(shè)計(jì)的開(kāi)關(guān)電容濾波器進(jìn)行仿真，結(jié)果基本與設(shè)計(jì)目標(biāo)吻合。

Abstract:

 This paper based on the reasonable selection of filter and the type of order， using low-Q value secondary filter on high-Q secondary filter for each level before class， the distribution of different for each level of output gain peak. In this paper， from the principle of switching capacitors， analyzes the circuit and capacitance programming， design an array of programmable switching capacitors 6 rank bandpass filter. Choosing appropriate amplifier parameters， programmable filter system altogether 3 road clock control parameters control module， filter programming to realize the internal control program memory chips. Through the design of the switch capacitance filter， and simulation results are basically identical with the design target.