Hello Junheng,
I apologize for forgetting to cover your query about the bypass capacitors in my previous post. In general I like to use a parallel combination of a 100pF and 0.1uF capacitors on any analog supply rail. For digital supply rails I just use a single 0.1uF capacitor. The parallel combination is useful because it helps to overcome the performance of real capacitors that exhibit self-resonance properties that may allow for very high-frequency components to sneak into the analog supplies. This is still possible using the parallel combination but it widens the stop-band on sensitive analog supplies. It may be considered over-kill to use this parallel combination and should not be considered necessary, but 0.1uF should be included on all supplies at least.