作者: Michael H. Perrott
DOI: 10.1016/B978-0-12-398326-8.00012-1
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摘要: Time-to-digital converter (TDC) circuits are a key component for achieving high-performance digital phase-locked loops (PLLs) which offer lower area and greater flexibility than their analog PLL counterparts. This chapter focuses on recently developed TDC architecture known as the gated ring oscillator (GRO) offers first-order shaping of its quantization noise delay stage mismatch. To provide context GRO discussion, background general implementation techniques is described along with performance issues related to frequency synthesizers. The concept then presented, followed by details measured results. Finally, recent variations such MASH structure achieves higher-order switched (SRO) improves robustness dead zones encountered TDC.