STK301-090 查看數據表（PDF） - SANYO -> Panasonic
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STK301-090 Datasheet PDF : 9 Pages
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STK301-090
Boost
When the volume control is set to the boost position, the
resonant circuit is connected in the output buffer amplifier
negative feedback loop. In this case, if R >> Ri, RNF, then:
AV
=
-R----N---F-----+----Z---
Z
Resonance Peak Sharpness (Q)
The resonance peak sharpness is determined by the maxi-
mum resonance peak value (GV max at ω0) and the −3dB
value (GV max/ 2 ) over the frequency interval ω2 − ω1.
The value for Q is given by the following equation.
Q = CC-----12----××-----RR----21--
and the output voltage is given by:
eo
=
AV × ei
=
-R----N---F-----+----Z---
Z
×
e
i
The gain of the resonant circuit is at maximum when Z is
at minimum, boosting the gain at that resonant frequency.
A larger Q indicates that the frequency bandwidth of the
resonant circuit is narrower and hence the crossover
between adjacent bands becomes more distinct. Under full
boost conditions, the wave-like shape of the frequency
response ripple increases whereas the peak of the resultant
frequency is lowered.
Cut
When the volume control is set to the cut position, the res-
onant circuit is connected in the output buffer amplifier
input. In this case, if again ignoring R, then:
ei′
=
-------Z--------
Ri + Z
×
e
i,
AV
=
1
As the STK301-090 has only a limited number of fre-
quency bands, the ripple increases under all bands maxi-
mum boost conditions. The value of Q is set to 3.5 under
all bands maximum boost for a pass-band ripple of 4dB.
and the output voltage is given by:
eo
=
AV × ei′
=
-------Z--------
Ri + Z
×
e
i
The gain of the resonant circuit is at minimum when Z is
at minimum, cutting the gain at that resonant frequency.
No. 4589—7/9
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