ʵ ԴԴ˲
һʵĿ
1ԴԴLPF(ͨ˲)ķƵԣ 2ԴԴHPF(ͨ˲)ķƵԣ 3ԴԴBPF(ͨ˲)ķƵԣ 4ԴԴBEF(˲)ķƵԡ
ͨʵ˽ԴԴ˲ࡢṹԣͶԱԴԴ˲˲ԣԴԴ˲Ʒ
巽
˲ǶźŵƵʾѡԵһ˿磬ijЩƵʣͨijƵʷΧźͨƵʵźŷֵҪܵ˥ơЩRLCԪRCԪɵԴ˲ҲRCԪԴɵԴ˲
ݷƵʾֹͨźƵʷΧIJͬ˲ɷΪͨ˲LPFͨ˲HPFͨ˲BPFʹ˲BEF֡
.ʵֺ;
ʵҪʵ·ʵģ5ԴԴ¼ԭͼΪҪʵ鲽裺
1ƴʵ·ʵģ·5ͨԴʾȹ۲˲˲ԡ
2ʵʱڱ˲ҲźŷֵUi£ıƵʣʾֵѹf200KHz˲˵ĵѹU0ıźԴƵʱӦ۲һUiǷȶиıӦʱ
3ϲ裬ֱԴԴLPFHPFBPFBEFķƵԡ ԡźϵͳʵָ顷
.ʵʵ
ʵݣƸ˲ķƵߡעӦͬ͵ԴԴ˲ƵԻͬһƽϣԱȽϡƵʡֹƵʺͨƵ
13
2-1
U/mV
12001000800600400200010100100010000f/HzԴͨԴͨ
ͼ2-1
14
2-2
U/mVԴͨԴͨ
120010008006004002000101001000f/Hz10000ԴͨԴͨ
ͼ2-2
15
2-3
U/mVԴԴͨ800700600500400300200100010100100010000f/Hz100000ԴͨԴͨ
ͼ2-3
16