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| 型號： | AN-1192 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | broad portfolio of monolithic power integrated circuits covering power levels |
| 中文描述： | 豐富的產(chǎn)品組合覆蓋功率級別單片功率集成電路 |
| 文件頁數(shù)： | 10/21頁 |
| 文件大?。?/td> | 548K |
| 代理商： | AN-1192 |
7.0 BPA200–200W Bridged/Parallel
Circuit
(Continued)
off as would normally occur with a DC blocking capacitor.
The servo circuits allow the low frequency power to remain
constant down to DC without high output offset voltage.
7.1.3 Noise Floor Tests
The following plots exemplify the low-noise aspects of the
BPA200.
Figure 10
was obtained using an 8k FFT relative to
1dBV with a measurement bandwidth of 22kHz.
Figure 11
is
the same measurement as
Figure 10
, but shown in a loga-
rithmic scale.
An FFT analyzer is extremely handy in determining the noise
culprit when debugging a new circuit and its layout, as well
as evaluating the coupling effects of the 60Hz component
and its harmonics. As shown in
Figure 12
, the noise level is
quite low and the influence of the power supply is relatively
small. The highest 60Hz components reach 105dBV, while
the noise floor sits around 120dBV.
Even with the limited number of graphs shown, the quality of
this amplifier from a measurement perspective is quite good.
However, with all audio equipment, nothing is really better
than doing a listening test. It is recommended that listening
test be done to confirm the audio quality of the different
configurations presented.
BPA200 Power Bandwidth
P
o
= 200W, R
L
= 8
, BW
>
500kHz, 9/16/97
20015106
FIGURE 9. Power Bandwidth
BPA200 Spot Noise Floor (dBV)
R
L
= 8
, BW
<
22kHz, 9/16/97
20015107
FIGURE 10. Linear-Scale Noise Floor
BPA200 Noise Floor (dBV)
R
L
= 8
, BW
<
22 kHz, 9/16/97
20015109
FIGURE 11. Log-Scale Noise Floor
BPA200 Noise Floor (dBV)
R
L
= 8
, BW
<
22 kHz, 9/16/97
20015110
FIGURE 12. Log-Scale 60 Hz Noise Floor
A
www.national.com
10
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