送信用オーディオフィルタを作る (part1) JA1VCW

1 1 (part1) PSN SSB PSN LPF HPF 1 HPF Highpass Filter PF Lowpass Filter PSN Weaver 3 KHz SSB 3kHz LPF Xtal Filter 6 OP-AMP Active Filter L-C

2 Passive filer CR OP-AMP Selen-Kay state-valuable - L-C - HPF OP-AMP LPF L-C HPF L-C L L LPF L-C OP-AMP FilterAudio Filter60dB60dBSH= 2 LPF L-C Passive filer K PC K L mH Q Xtal spice 50 F=2200kHz RT=660 L,C 50 LPF L.

3 C RT=670 50 -45-40-35-30-25-20-15-10-5050 1000 2000 3000 4000 spice R=50spice 3 HPF OP-AMP HPF 100Hz L-C 150Hz NFB Sellen-key PFB -3dB 150Hz 24dB/oct 50Hz 33dB Butterworth 4pole HPF-35-30-25-20-15-10-500 100 200 300 400 HzdBF L 1 C 1k DDS DDSOSC 100k CL10 1 L-C 10mm HPF 4 PSN on-air LPF 1 Q

4 MICAMP > HPF > LPF HPF 50Hz HPF 50HZ 30dB OK 300Hz > 3kHz LPF > HPF 150kHz > 200Hz HPF LPF FDNR -50-40-30-20-100100 1000 2000 3000 4000 HzdB 5 C, G0 F0 Q 4 C G0 F0 -3dB Q QK = 1/(2* *F0*C1)C1 = C2 = CC3 = C1/G0R1 = K/(Q*2+1/G0 R2 = Q*K*(2*G0+1) Excel 2 Q 2 2 = )

5 1 Q= Q= Q Excel Q R1R2C1C2C3 HighPassFilter K C1C2L1L1 Z0/(2* *F0 C1 = C2 = 1/(2* *F0 F0 -3db 1 Z0Z0 CQ 6 (part2) part1 LPF LC op-amp LPF part1 Ripple cuttoff 2700Hz -40dB @ 2 *5 10 HP A-E))

6 A op-amp NJM4580 Dual OPAMP) 1% 5% R1R2C1C2R3 R1R2R3C1C2A 10 10 10 20 20 18 470pF 10 10 220pF k uF10 LPF ripple cutoff DDS 2006/05/05JA1 VCW 7 HPF/LPF 2000 4000 6000 LPF 2500 3000 HPF/LPF (LPF LPF Cutoff OK F 1dB CR E24

7 (PSN op-amp 1)