An 11-bit and 39 ps resolution time-to-digital converter for ADPLL in digital television

作者：Liu, Wei; Li, Wei; Ren, P.; Lin, C. L.; Zhang, Shengdong^*; Wang, Yangyuan

来源：International Journal of Electronics, 2010, 97(4): 381-388.

DOI：10.1080/00207210903325237

• all-digital phase-locked loop (ADPLL)
• digital television (TV)
• free-running ring oscillator (FRO)
• frequency synthesiser
• time-to-digital converter (TDC)

We propose and demonstrate an 11-bit time-to-digital converter (TDC) for all-digital phase-locked loops (ADPLLs) in digital television. The proposed TDC converts the width of the input pulse into digital output with the tap space of the outputs of a free-running ring oscillator (FRO) being the conversion resolution. The FRO is in a structure of coiled cell array and the TDC core is symmetrical in the input structure. This leads to equally spaced taps in the reference clocks and thereby a high TDC conversion linearity. The TDC is fabricated in 0.13 mm CMOS process and the chip area is 0.025 mm(2). The measurement results show that the TDC has a conversion resolution of 39 ps at 1.2 V power supply and a 4.5 ns dead time in the 11-bits output case. Both the differential non-linearity (DNL) and integral non-linearity (INL) are below 0.5 LSB. The power consumption of the whole circuit is 4.2 mW.

• 出版日期2010
• 单位北京大学深圳研究生院; 北京大学