Bluetooth audio circuit board manufacturers believe that mobile phone circuit board design to improve audio performance should:

1. Carefully consider ground-level planning.

The ideal floor plan should divide different types of circuits into different areas.

2. Use differential signaling whenever possible.

Bluetooth audio circuit board manufacturers recommend that audio devices with differential inputs are capable of suppressing noise. Generally, the ground wire cannot be added in the middle of the differential signal. Because the most important point of the application principle of differential signals is to use the benefits brought by the mutual coupling between differential signals, such as magnetic flux cancellation, anti-noise ability, etc. If you add a ground wire in the middle, it will destroy the coupling effect.

3. Isolate ground currents to avoid digital currents adding noise to analog circuits.

Bluetooth audio circuit board manufacturers have found that basically, it is right to isolate the analog/digital ground. It should be noted that the signal traces should not cross the divided places as much as possible, and the return current paths of the power supply and the signal should not change too much. The requirement that the digital-analog signal traces cannot cross is because the return current path of the slightly faster digital signal will flow back to the source of the digital signal along the ground near the bottom of the trace as much as possible. If the digital-analog signal traces cross, the return current will be The resulting noise then appears in the analog circuit area.

Bluetooth audio circuit board manufacturers believe that analog circuits use star grounds. Audio power amplifiers typically draw large amounts of current, which can adversely affect their own ground or other ground references.