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AN2583 bảng dữ liệu(HTML) 11 Page - STMicroelectronics

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AN2583
Audio characteristics
11/18
2.2.4
Bridged amplifiers
A bridged amplifier uses two identical amplifiers driven 180° out of phase. The circuit shown
in Figure 12 uses two single supply amplifiers, AX. These would each be comparable to the
amplifier of Figure 7.
The input signal is connected unchanged to the left amplifier and inverted prior to going to
the right amplifier thus making the right one 180° out of phase with the left.
The outputs of the two amps, VL+ and VL–, are each biased at VDD/2. Thus, the quiescent
difference between them is 0 V. Therefore, no DC blocking capacitor is required at the load.
Figure 12.
Bridged amplifiers
Each output can swing between VDD and ground as shown in Figure 13.
Figure 13.
Outputs of bridged amplifier
VIN
RL
VDD
VL
+
–
VL+
VL–
Ax
VDD
Ax
ai13938
0
VDD / 2
VL–
VDD
VL+
0
VDD
VL
VL-PK
VDD
ai13939



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