比如9MHz晶体,
(1)---------------------带宽2.7KHz的时候是: \
fs = 9 MHz
fp = 9.008 Hz
Cs = 27.1 fF
BP ripple = 0.5 dB (Tchebycheff)
Poles = 2
Target bandwidth = 2.7 kHz
Maximum bandwidth: Bmax = 3.216 kHz
Center frequency:
f0 =9.002511MHzUltimate attenuation: UAtt = 27 dB
Filter impedance: Z0 = 227 Ohm
CP1 = 55.3 pF
CS1 = 55.3 pF
(2).--------------------------带宽2.00000000KHz的时候是:
fs = 9 MHz
fp = 9.008 Hz
Cs = 27.1 fF
BP ripple = 0.5 dB (Tchebycheff)
Poles = 2
Target bandwidth = 2 kHz
Maximum bandwidth: Bmax = 3.216 kHz
Center frequency:
f0 = 9.001668 MHzUltimate attenuation: UAtt = 34.7 dB
Filter impedance: Z0 = 121.7 Ohm
CP1 = 103.1 pF
CS1 = 103.1 pF
(3)------------------- 带宽0.6KHz的时候是
fs = 9 MHz
fp = 9.008 Hz
Cs = 27.1 fF
BP ripple = 0.5 dB (Tchebycheff)
Poles = 2
Target bandwidth = 0.6 kHz
Maximum bandwidth: Bmax = 3.216 kHz
Center frequency:
f0 = 9.000447 MHzUltimate attenuation: UAtt = 58.6 dB
Filter impedance: Z0 = 25.1 Ohm
CP1 = 500.7 pF
CS1 = 500.7 pF
[ 此帖被浦东星在2012-12-20 13:51重新编辑 ]