Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
2-Channel 300mW Class AB Power Amplifier
PT2308P
3. Input Coupling Capacitor Ci
In typical applications, this input coupling capacitor transfers signals between the input and
PT2308P, it allows block DC bias of the PT2308P flowing into input signal, and thus the user must
be aware of the voltage tolerance and the polarity of this Cap.
Referring to the diagram above, Ci and R1 forms a 1st order high-pass filter; the lower-cutoff
frequency is determined by the equation:
fc(highpass)=1/2πR1Ci
The diagram below shows the frequency response when: Ci=10µF/1µF/0.47µF/0.22µF/0.1µF
PT2308P V1.0
-5-
November, 2005