【经验】音频电路中爆音的产生原因与解决方案

时间： 2021-07-25 来源：思瑞浦

技术问答

音频应用中常因DAC输出音频信号幅度较低，通常会使用运算放大器进行信号放大。但面对系统中只有单电源的情况下因直流偏置引起的爆音问题是音频电子工程师的一大困扰。下面我们使用3PEAK的TP1562A一起探讨爆音产生的原因和解决方案。

系统上电的爆音很多时候是因为输入耦合电容没放完电时就打开了音频通道，以致电容的放电直接被运放放大输出就产生了爆音。

图1.

上面图1.是音频放大器应用中的常规电路，通过主控GPIO控制MOS管可以有效控制系统上电的爆音。那么GPIO口什么时候才释放MOS管呢，我们来看看电容放电的时间：

Vt=Vu*exp(-T/RC)，即：T=RC(lnVu-lnVt)

Vt：T时刻的电容电压，Vu：电容放点前的初始值，电容充满电E=Vu。

再如图1，因为运放输入是高阻，所以电容的放电时间常数是：

C2*(R5+R4)=2.2u*105K

如果主控CODEC供电是3.3V，那么Vu=1.6V，但是电容放电Vt无限接近0时（-lnVt）无穷大，所以我们可以假设当Vt=500uV时，运放输出已经听不到爆音。

将参数值代入上式：T=(2.2u*105K)*(ln1.6V-ln500uV)=1864ms

也就是说CODEC上电后，主控的GPIO口置高控制2N7002的时间必须大于1864ms才能保证运放输出没有爆音。MUTE住1864ms对于有些系统的应用来说没问题，但也有些系统希望不能延时太长，上电之后很快系统就能正常工作。那么可以对系统中的电容放电时间常数进行调整，可以将R4，R5等比例减小，以减小C2放电时间常数RC来达到目的。

另外，改变RC的时间常数，有可能会影响音频最重要的指标之一：幅频特性。如果在不影响幅频特性前提下，RC的时间常数已经改到了最优，还是无法满足系统上电就能快速工作的要求，那么我们可以考虑通过改进电路来解决问题。

图2.

图2.是改进之后的电路，增加了个N管进行辅助放电。8050导通，C2的时间常数：

C2*(R5+3.8K)

T=(2.2u*33.8K)*(ln1.6V-ln500uV)=600ms

增加个N管，改变了电容C2的放电路径，改善了放电时间常数，当然在不影响频响的前提下，等比例减小R4、R5，还可以获得更优的时间常数，加快电容放电时间。

可能有些朋友会问C3的电容2.2uF，前面有个2.5V的DC偏置，是否也会因为放电问题产生爆音。我们来看C3后面串1K电阻然后通过一个MOS拉地，虽然有个2.5V的偏置但由于它的放电时间常数很小，只要运放上电时确保MOS管也同时导通控制爆音就好，上电时C3的充放电可以完全忽略。

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本文由董慧转载自思瑞浦，原文标题为:音频电路中上电爆音的产生原因与解决方案，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。

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目录- 公司简介新产品列表运算放大器和比较器 AFE 电源管理IC LED驱动器/控制器音频和视频IC 通信用IC和射频器件电机IC 光电传感器信号调节外设产品封装一览产品索引

型号- NJM2902C,NJM2902B,NJU7076B,NJM7056,R3134,R3133,R2045,NJW2368,R1191,R5550,NJW4303,R1190,NJM2842,R3132,NJM2841,R2043,R3130,NJM2846,NJM2845,NJM2847,NJL5901AR-1,NJM5532C,NJM2901C,R5110XXX1A,R5110XXX1B,NJM393C,R5326,NJG1697EM1,R5324,R3150-A,NJU6364系列,R5560,NJU6397系列,NJW2377,NJU1206MER,NJM2855,R2051,NJM2857,NJM2856,NJW1280,NJU7098A,NJM2902CA,R5110XXX2C,R5110XXX2D,NJM390A,NJU211,R3150-B,R2061,R3150-E,NJW2344,NJM2820,R3154,R3150-F,NJM2822,R2062,R3152,NJM2821,NJW4760,RM516,NJM2823,NJM2825,NJM2828,NJG1801AKGC-A,NJM2827,NJM2829,NSNJ9200A,NJM064C,NJM391A,RS5C338A,R5106,NJU3610,R5107,R5108,R5109,R5104,R5105,NJM2151A,R3160,R5101,NJM2831,NL6010,NJM2830,NA2100,NJM2835,NL6011,NJM2837,NJM2836,NL6012,NJM2839,NJL5902R,R1155,NJG1669MD7,R1154,NJW4107,NJU72501,NJW4106,NJW4105,NJM2570A,NJW4104,NJW4100,R1150,NJM2801,NJM2804,NJM2806,NJM2805,R5528,NJM062C,R5524,R5527,R5520,NJW4109,NJG1684ME2,NJW4108,R5523,NJW4118,NJW4116,NJW4113,R1163,R1160,R1161,NJW4111,NJW4110,NJW4351,NJM2815,NJM2816,NJM12877,NJW4162A,NJU7381A,NJG1108HA8,NJM2904CA,R3114,R2025,NJM2819A,R3112,NJG1617K11,R3111,R5538,R2023,R3118,R3117,NJM2904C,R5533,R3116,NJM2904B,NJG1144KA1,R1170,R3200X064A,NJMOP177,R1173,NJM2374A,R2262,NJW1298,NJW4321,R1171,NJW4320,R1172,NJM78M00S,NJM2903C,NJU7382A,NJM084C,RN5T618,R2033,NJG1801BKGC-A,R5542,R5543,R1180,R5540,R5541,NJM2373A,NJG1657MD7,NJW2392,NJM12856,NJU7365,NJU7366,NJU7367,NJU7092A,NJM2879-H,NJU7364,NJM2748A,RP600,MUSES8832,RN5U700,RP602,RP604,RN5T614,RP605,NB7200,NJU7360,R1801,NJU7356,NJU77572,R1800,NJM41001T,RN5RZ,NJU8759A,NJU7093A,NJU6368系列,NJU7116,NJL6402R-2,NJU7118,NJU7119,NJM2505A,NJU6322系列,NJW1200,NJG1740MHH,MUSES8820,RN5VD,NJU7387,NJU72090,R1810,NJU7141,R3200X002X,NJU7384,NJU7385,NJU7386,RC5T519,NJU72097,NJU6311系列,RM590,NJU7380,NJG1730MD7,NJU9555,NJM17431,NJM2769B,NJU77550,NJU7091A,R3200X001X,NJU77552,NJU77551,NJU77554,NJU6377系列,NT1189GDAE3S,NJU9103,RC5T619X,NJU9102,NJU9101,R5117,R5114,NJM2880,R5115,R5116,NJM2882,NJM2881,R5110,NJM2884,R5111,R3121XXXXG,NJM2883,NJM2641,R5112,NJM2886,NJW1230,NJM2885,R5590,NJM2888,NJM2646,NJM2887,NL6002,R3121XXXXA,NT1191GEAE3S,NJM2407,R3121XXXXE,NJM8191,NJM8190,NJU6063,NJU7394,RM517,RV5C348B,NJU6366系列,NJG1812ME4,NJM2893,NJM2173A,NJM2892,NJM2894,NJW1241,NJW1240,NJG1812AMET-A,NJU7392,NJU6062,NJU6061,NJU6222系列,NJU77580,NJU77582,RN5RF,NJU6402B,NJM2860,NJM2862,NJM2861,NJL5909RL-4,RN5RL,NJM2864,NJM2863,RN5RK,NJM2866,NJG1682MD7,NJM2865,NJM2868,NJU7181,NJM2626,NJM2867,NJM2627,NJL5830R,RN5RT,NJL6195R,NJW2307,NJM2749A,NJM2871,NJM2870,NJG1159PHH,NJW2311,NJM2872,R3121-A,NJM2875,NJM2874,NJM2877,NJM2876,R3121-E,NJU6080,NJM2879,NJM2878,R3121-G,NJG1816K75,NJG1143UA2,NJU7640,NJM14570,NJU6311,NC2700M,NJM2288,NJM2287,RP200,NJL5513R,RS5C372A,RP201,RS5C372B,RP202,NJW1143A,NJU7630,NJU7631,NJU7632,NJM2872A,NC2701M,NJU71074,NJM8830,NSVS1231,NJM2299,NJM2059,NJM2058,NJM2872B,NJG1145UA2,NJG1814MD7,NJU8759,NJU71041,NJG1146KG1,NJMOP1772,NJU8758,NJW1142A,NJU71044,NJW4305A,NJM5532,NJM084CA,NJM8801,NJM2871A,NJL6193R-3,NJM2871B,R3120XXXXE,NJU6323,NJU6322,NJU6321,R3120XXXXA,NJU7650,NJG1186PJL-A,NJU6324,NJW1933,NJM2275,NJM2274,NJM2278,NJM1431A,NJL6407R,NJM3414A,NJL6502R-1,NJM14558,NJU7200,NJU7201,NJU7202,NJM2768B,NJU7680,RP402,NJG1151MD7,NC2600,RP400,RP401,NJU7098AF1-C,MUSES72323,NJU3719A,NS1101,NJU7670,NS1102,NJU6324系列,NJU7677,NJM78M00,NJM41005T,NJG1818K75,NJM358C,NJL5510R,NJU7222,NJU7223,NJG1648HB6,NJL6401R-3,NC2702M,NJU6377,NJU6376,NJU7221,NJL5313R,NJM082CA,NJU7211,NJU6363,NJU6360,NJU7691,NJU6367,NC2703M,NJU6366,NJU6365,NJU6364,NJU6369,NJU6368,NJU8789,NJM358CA,NJU77903-Z2,NJU7690,NJU077,R1232,NJM2586A,RN5C752,NJD3015,RN5C750,NJM064CA,NSVS1093,NJW4148,R5111XXX1A,R5111XXX1B,NJW4142,NJW4141,NJW4382,NJW4140,NJW4750T1,NJM45001,NJW4381,R1243,R5601,R5602,R1242,NJU72322,R1245,NJG1186PJL,R5111XXX2D,NJU72315,NJW4615A,NJU72750A,NJM2561B,NJG1800NB2,R1240,NJM2561A,R5111XXX2C,NJW4155,NJW4154,NJW4153,NJM13403,NJM13404,NJU7388B,NJG1739K51,R5617,R5619,R5612,R5613,NJM393CA,R5610,R5611,NJW4119,NJW4128,NJU72751A,NJW4810A,NJM2584A,NJW4122,NJW5211,NJW5210,NJW4120,MUSES72320,NJG1173UX2,NSTS9116A,NJW4152-AB,NJD3004,NJU71091T1,NJD3007,NJG1801K75,NJW4138,NJM2583A,NJW4375,R1260,NJW4133,NJW4132,NJL6195R-W,NJW4372,NSTS9117A,NJU7386A,ND1160,NJU7606,NJM2566A,NJU7600,RN5C713,NJU7601,NJU7602,RN5C711,NJW1871A,RN5C716,NJM062CA,NJW4188,NJW4187,NJU7367A,NJW4186,NJU4051B,NJW4185,NP8700,NJW4184,NJW4183,NJW4182,NJW4181,NJU7367B,R1207,NJW4190,R1208,R1205,R1206,R1200,NJU71031,NJG1127HB6,NJG1156PCD,NJMOP2277,R1203,R1204,NJU71032,R1202,NJU77806,NJG1666MD7,NJW4196,NJW4191,R1218,NJU7620,NJU4053B,NJM2060,R1210,R1211,R1214,R1215,R1212,R1213,NJM2068,NJU3711A,NJM339C,NJW4161,ND1130,NJW4160,NJG1686MHH,NR1700,NJU7610,R1225,NJU72344,NJU72343,NJU6394系列,R1223,NJU72342,R1224,NJU72341,R3150XXXXE,R3150XXXXF,NJW4177,NJU4052B,NJG1117HA8,NJW4175,NJW4172,NJW4171,NJW4170,NJU3712A,R3150XXXXA,R3150XXXXB,NJM41031,NJU7870-Z2,NJM41033,NJM8020,NJU7086,NJM2903CA,NJM41035,R5114XXX2,R5114XXX1,NJU7391A,NJU7089,R5436,R5437,R5438,NJM8021,R5439,R5432,R5433,R5434,R5435,NJG1187KG1,NJW1159,NJM2723,NJM2725

选型指南 - NISSHINBO - 2023/4/27 PDF 中文下载

经典PNP三极管MMBT3906，可用于音频放大电路、电源电路和射频放大器

PNP型三极管和NPN三极管在极性上有一定区别，电流从发射极E流入到基极和集电极，这种三极管的应用领域一样非常广泛，在开关和放大电路里面经常可以看到它的身影。本文合科泰电子介绍一款经典PNP三极管MMBT3906，可用于音频放大电路和LED等应用。

产品发布时间 : 2024-07-25

华冠半导体宣传册

型号- HG9923,DS1302,TEA2025,DS1307,CD4069,MAX187,XC61C-XX,CD4075,CD4073,TL494,NE556,NE555,CD4078,CD4077,MC34U8,75N08,HGC5615,24C128,CD4071,CD4070,KA7500,HG9261XX,FCF8563,LM3480,74HC4067,LM311,LM432,LM431,LM555,LM317,74HC32,74HC595,CD4068,CD4067,CD4066,74HC238,HG51031,CD4060,24C256,HG1201-XX,HG9921,MAX6576,HG9922,LM4580,74HC00,74HC03,HG202,HG1205-H,74HC02,MAX3085,74HC04,HG3480,74HC07,CD4094,LM386-1,LM1084,LM1085,HG29100-XX,LM1086,LM1087,HGC29300-XX,CD4093,74HC4046,HG9910,LM1083,HG335,74HC14,LM79XX,HG24C08B,HG18B20,74HC573,74HC574,HGC5620,74HC4053,74HC08,HGC29150-XX,74HC4051,74HC4052,CD4081,LP2954,ZNBG4000,LP2951,LMV321,LP2950,ICL8038,HG8F629,HG8F628,NE594,HGC2543,MAX7219,HG75176,HGC2549,HG2003,LM29150,HG2004,LM4250,HG13085,HG3232,HG235,LM78XX,HG232,HG1051,LM358,HG1052,HGV8558,HGV8556,HGV8554,LM2937-XX,HGV8551,HGV8552,CA3140,HG8F630,HG8F873,AD590,74HC273,HG2593,LM1117-XX,LM321,HG485,HG2591,LP3965-XX,LM324,HG2592,LM567,13N50,LM317M,LM317L,74HC123,74HC244,74HC245,74HC125,HG8F887,HG8F883,LM317T,LM7660,LM331,HG135,HG0066,HG0065,HGC1589,LM336,HGV8965N,LM339,HGV8331,74HC132,74HC374,74HC138,74HC139,DS1990,74HC373,LM386,CD40106,LM385-1.2 2.5,LP2997,LP3965,LP2996,LP2995,XC62FP-XX,LM78L05,LM78L06,MC3845,LM78L08,74IIC164,LM78L09,LMV358,MC3842,MC3844,9N90,MC3843,TDA2822,LM385,HG6008,HG24C02B,HGV2774,HGV2771,HG5171,HGV2772,TDA8138,LM78M12,TDA8137,LM78M15,HGC5213-XX,74HC192,74HC193,74HC194,LM393,HG3085,ZNBG3211,HG24C256,74HC86,MAX489,74HC165,HG1582-XX,MAX488,LM78M06,TL072,LM2940-XX,HGV258,LM78M08,LM78M09,IIG34C87,TL074,50N06,28N60,74HC164,HGC1549,ULN2803,ULN2804,HG298,HG297,HG24C128,HGC1543,MAX232,TL082,TL084,HG1203-XX,HG293,LMC555,HG54123,LM285-1.2 2.5,LM2904,HG6570,LM2901,LM2902,LM2903,HGV358,85N06,HG3078,MAX490,HG3075,MAX491,HG3072,74HC74,HGV224,TL064,TL062,HGV221,MIC5212,HG1108-XX,HG24C04B,HG24C16B,DS75176,74IIC238,50N50,HGV8054,HGV324,74IIC04,TRF830,HGV321,LM8002,XC62GR-XX,HG24C32,HGC29500-XX,TEA2822,HG75HVD3082E,HG7189,LM3916,LM78LXX,IRF830,LM3915,HG93C56,LM3914,TL064C,MXA485,HG2981,HG2980,LM2954,HG93C46,HGC52XX,HG34C86,HG34C87,MAX13805,IIGV8555,MC34119,MC34118,LM2576-XX,IRF730,HG8137,CD4528,HG7169,IIGC8F 629,70N06,LM78MXX,CD4520,TLC2543,HG8138A,HG1734,HG1735,20N60,HG1185-XX,HG1851,IRF840,CD4518,HG1990,CD4517,HG1991,HG7179,LM1881,24C64,CD4511,LM2931-XX,HGL297,HGL298,HG93C66,HG1509,KA7500B,LF347,LM29302,HG1501,HG1621,HG75LBC184,HG75LBC182,CD4543,TL072C,TL084C,HG2803,HGL293,LF398,HG75LBC176,IRF740,3N80,CD4538,I.M78M05,CD4541,XC62GP-XX,24C32,20N50,MAX1487,4N60,MC1403,24C08,MAX202,TL074C,TL062C,TLC5615,HG1937,LM2575-XX,HG1932,24C02,24C01,24C04,HG7012,LM78L12,LM78L15,CD4562,HG809,LM29502,24C16,HG2571,HG2572,HG2573,HG3421,HG3420,11N90,12N60,ICL7660,93C06,HGC5219,LM2596-XX,HGC8F 887,TDA2030,75N75,HG8F676,HG8F675,LM4860,HG3423,HG1487,HG3422,LM3414,HG1583,LM1117,LM4862,LM4861,HG1580,LM4863,HGC8F 630,TL082C,CD4007,HG1208-XX,TDA2003,CD4013,CD4011,LM4990,LM4871,HG8F683,HG8F684,ULN2003,ULN2004,LM2574,LM2575,HGV8538,LM2576,HGV8535,HGV8536,HGV8534,HGV8531,MC34063,HGV8532,LM7905,LM809,CD4001,HG3526,HG3525,24C512,HG3524,LM35,LM7915,LM741,HGV8728,LM7912,HGV8968,HGV8726,HGV8966,CD4028,HG24C512,CD4027,HGV8965,CD4025,OP07,10N80,74HC540,74HC541,ICL7106,PCF8563,ICL7107,HG4824,HGV8052N,LM4890,HGC8F675,LM7805,LM7924,TD62083A,LM2596,CD4017,LM79LXX,HGC8F 684,CD4015,LM7809,LM7808,HGC8F 683,LM7806,CD4020,HGV2771N,CD4024,CD4023,CD4022,HG26C31,HG26C32,10N60,LM56,LM7815,HG56,ZNBG6000,LM7812,TD62084A,HG70XX,74HCU04,NE5532,CD4049,HGC8F 676,CD4053,CD4052,CD4051,93C66,CD4050,HG2623,HG2982,HG2985,HG2621,HG2622,UC3845,LM4558,HG24C64,74LVC1G04,UC3842,UC3843,UC3844,LM79MXX,7N60,TLC1543,IIGV8334,93C56,CD4040,IIGV8332,CD4046,74HC533,74HC534,LM4560

商品及供应商介绍 - 华冠半导体 - 2022/2/8 PDF 中文下载

芯谷科技（Silicore）模拟和数模混合IC选型指南（英文）

目录- Company Profile Audio and Video Circuit Power Management Circuit Communication Series Circuit LNB Circuit of Satellite Receiver Capacitive Touch Key Control Circuit Clock Controller Circuit Power Tool Speed Control Circuit Leakage Protector Circuit Operational Amplifier Circuit Driver Circuit Universal Microcontroller Circuit

型号- D8051,D8052,D32F103,D8053,D32F104,D8054,D32F105,MXD2002,D4809,MXD2001,79LXX,MXD2000,D4890,D7000,D70XX,D1381,D337,D8634CF,D2068,D2587,LMV358,D1084-XX,D8600,MC34063A,D4800,D2107,D6287,D4140,D6283,D6282,D2630,D2596,D3842,D2632,78SXX,D2631,D2076,D2504A,D7368,D3845,D3846,D1302,D3843,D3844,D54123B,D55125ADA,D02,D2171,D2576HV,D358,D232,D8829,TS01S,D8543,D8544,S321,D1237,D2568,ULN2003,D3414,D34018,D54123,ULN2803,D8563,D1117-XX,B34063,D2212,WL431,D1122,D2577,D4510,D2576,WL432,D3308,D7500,79XX,D3703,ULN2803L,D75232,D9741,GS069,D5020,D2596HV,D258,D2025,D5139,D4202,D5534,D5015,D5532,D4440,D8400,D8521,D7312,D8522,D8128,D8524,D2668,D2822,D7292,TS08N,D34118,D1509,S324,D706,LDO SERIES,D8541,D2822M,D8542,D4580,78MXX,TS223B,D7050,TS223C,D3485,D3121,78XX,D1085-XX,D1507,D3524,D336-5.0,D3525,D29150,S358,D29151,TS12,79MXX,D317,D2822ML,D2761,D1675,TS223,D4147,D4145,D3211,D1671,D8227,D6208,TS06,TS04,GS016,D431L,D4560,KS4558,78LXX,D724,D723,D722,D721,D324,D2652,D4556,D2651,D321,D2650,D6211,D8631,D2538,D8632,D8634,D1721,D336-2.5,D4558,D31101

选型指南 - 芯谷科技 - 2023/4/10 PDF 英文下载

合科泰PNP三极管TIP32A具有高耐压高温工作能力，可用于音频放大器电机驱动等领域

三极管能放大电流，PN结起到关键作用。其工作原理与截止、放大、饱和三种工作状态有关，在模拟电路和数字电路中，三极管均有重大应用。本文，合科泰电子给大家推荐一款中大功率放大器件三极管TIP32A，它在计算机电源、通讯、家用电器、功率放大器、音频放大器等领域得到了非常广泛的应用。

产品发布时间 : 2024-06-25

ROHM（罗姆）音频/视频IC选型指南（英文）

描述- ROHM offers wide ranges of interface Audio ICs and Video ICs, such as Image Correction ICs, Audio Converters, Audio Amplifiers, Audio Processors, Video Amplifiers. It is the masterpiece of ROHM audio IC which pursues both the numerical values and sound quality performance required in an audio device to the utmost limits and created through the ardency of ROHM engineers.

型号- BA3123F,BD5632NUX,BH3548F,BD34704KS2,BH76363FV,BH76806FVM,ML86112,BD37069FV-M,BD37034FV-M,BH76812FVM,BD5467GUL,BD37511FS,BD88215GUL,BD5413EFV,ML86V7668A,BD78316EFJ-M,BD34301EKV,BD88400FJ,BD78318EFJ-M,ML86245,BD5461GUL,BD37542FS,ML86243,ML86640,ML86244,BD28623MUV,BH76112HFV,ML86241,BH7649KS2,ML86242,BD78320EFJ-M,ML86V76580,ML86240,BD37523FS,BD27400GUL,BD88210GUL,BD5424EFS,BD3465FV,BD8876FV,BD5638NUX,BH76360FV,BD78322EFJ-M,BD88415GUL,BD37503FV,BD7830NUV,BD37533FV,BD37514FS,ML86V7675,ML86V8401,BD5469GUL,BD3843FS,BD3461FS,BH76332FVM,BD3465FS,ML86101A,BU26154MUV,BD3870FS,BD34701KS2,BH76906GU,BD37541FS,BH76206HFV,BD88410GUL,ML86660,ML86781,BD37515FS,BD34700FV,BD37534FV,BD5466GUL,BD37522FS,BD78306EFJ-M,BH7673G,BH3544F,BD3464FV,BH76361FV,ML86799,BD34352EKV,ML86797,ML86795,BD5460GUL,ML86796,BU94605AKV,BD37513FS,BD37532FV,ML86V8102,BD78310EFJ-M,ML86V8101,BD88220GUL,BD3460FS,BD3403FV,BU6521KV,BD3464FS,BD37068FV-M,BD78308EFJ-M,BD88400GUL,BH76816FVM,BH76330FVM,BD78324EFJ-M,ML86V7655,BD78312EFJ-M,ML86209,BH76333FVM,ML86207,BD3474KS2,BU94702AKV,BD3871FS,BD37033FV-M,ML86203,BD78326EFJ-M,BD88200GUL,ML86289,ML86287,ML86321,BD37544FS,BD7836EFV,BD34602FS-M,ML86160,BU26156RFS,BD3814FV,BD37521FS,BD5468GUL,BD28412MUV,BD3491FS,BU1523KV,BH76109HFV,BD8878FV,BD5634NUX,BA3121F,BD3883FS,BH76362FV,BH76916GU,ML86177,BH76912GU,ML86175,ML86173,ML86174,ML86172,BD5465GUL,BD37531FV,ML86290,BD37512FS,ML86V8201,ML86291,BD3841FS,BU7150NUV,BH76106HFV,BD88420GUL,BH3547F,BD34705KS2,BD37067FV-M,ML86V8202C,BD37543FS,BD5423AEFS,BH76809FVM,BD37524FS,BD3812F,BD78314EFJ-M,BM28723AMUV,BD5426EFS,BD37201NUX,BD3490FV,BH76331FVM

选型指南 - ROHM - 2023 Edition - 2022/12/28 PDF 英文下载

当使用运算放大器构成音频电路时，实现低噪声化的关键是什么？

首先，必须降低信号源电阻，减少热噪声的影响。这时，不仅要降低前级电路的输出电阻，还要降低与输入端子相连的所有电阻值。为此，必须降低反馈电路的电阻值。另外降低各部分的输入阻抗，也可有效防止外来噪音的影响。在常温下，1kΩ电阻产生的热噪声大约为4nV/√Hz，如果此大小电阻串联到输入端，NJM5532级别的运算放大器的功效就会减少一半。一般而言，低噪声双极晶体管输入运算放大器的偏置电流较大，可能产生与基极电流平方根成正比的电流噪音。因为输入换算噪声电流和信号源电阻的乘积将加算到输入换算噪声电压上，所以当如无法减小信号源电阻时，则可采用输入偏置电流较小的J-FET输入运算放大器(NJM072B、NJM2082)。这样做有时会比选用输入换算噪音电压较小的双极晶体管输入运算放大器效果更好。另外，PCB板上的GND多为一点接地，注意不要使产生噪音的电流回路和信号回路具有共同的输入阻抗。此外，要降低电源电路的噪声，布线方面还有许多注意事项。由于这些内容超出了说明范围，无法详细解说，建议参考有关专业书籍。

技术问答发布时间 : 2024-05-31