摘要：
电路能力测试：运算放大器音频电路CircuitKnowledgeTest-5:AudioOperationAmplifierWhatwillbethemajorfunctionforthisoperationamplifiercircuit?2.Whatwillbetheamplifiergainforthiswholecircuit?(withoutfrequencyresponseconsideration)ExplainthefunctionofCD30,RD18,RD20components?ExplainthefunctionofCD26,CD28,RD17components?ExplainthefunctionofCD27,RD19,RD16components?试题解答CircuitKnowledgeTest-5:AudioOpera
电路能力测试：运算放大器音频电路
Circuit Knowledge Test-5: Audio Operation Amplifier
- What will be the major function for this operation amplifier circuit?
2. What will be the amplifier gain for this whole circuit?(without frequency response consideration)
- Explain the function of CD30, RD18, RD20 components?
- Explain the function of CD26, CD28, RD17 components?
- Explain the function of CD27, RD19, RD16 components?
试题解答
Circuit Knowledge Test-5: Audio Operation Amplifier
ANS-1:
Band pass filter for DVD output.
ANS-2:
Amplifier Gain: Av = RD16/RD17 = 1
ANS-3:
RD18 and RD20 set up the center bias for maximum undistorted output of ICA3.
CD30: the ripple filter for ICA3.
ANS-4:
CD26 and RD17 set up the low frequency cut-off point for band pass filter.
CD28 and RD17 set up the high frequency cut-off point for band pass filter.
CD26 also acts as dc-isolation capacitor.
ANS-5:
CD27 and RD19 act as a second low pass filter and set for cut-off point 40 KHz or more to improve S/N. To set at 40 KHz means there will be 3 db cut-off for 20 KHz. (while RD19 in series with RD17)
RD16 sets up the gain for band pass filter. (Av = RD16/RD17)
