System and Integrated Circuit Design.

Digital Phase Lock Loop          ~ 2003

• All digital phase lock loop with ring oscillator
• Small Phase diference
• Phase locked after 1 clock cycle

OTA design                              ~2005

• Wideband and low noise design
• Low power dissipation
• Cascode OTA structure

Sound Synthesizer                  ~2003

• Synthesize sound by Physical mechanism model
• No voice sample required, small memory area
• Great timbre with smaller chip size