Accurate PLL Characterization Using Virtuoso Spectre RF Noise ...
Accurate PLL Characterization Using Virtuoso Spectre RF Noise ... Accurate PLL Characterization Using Virtuoso Spectre RF Noise ...
4 Challenges of PLL Simulation • f ref PLL are “stiff” – – Ref Div September 17, 2007 f ref PFD CP LPF VCO circuits Divide by N Contain two widely-spaced time constants N * fref For wireless systems, the VCO often oscillates orders of magnitude faster than the reference frequency Out
5 Challenges of PLL Simulation • • f ref Ref Div Behavioral model based simulation approaches accelerate simulation speed, allowing designers to trade-off block characteristics and PLL performance. Cadence has developed a new non-linear model that allows designers to accurately simulate the dynamic behavior of the VCO, such as injection locking and power-supply interference. September 17, 2007 f ref PFD CP LPF VCO Divide by N N * fref Out
- Page 1 and 2: INVENTIVE Using Spectre RF Noise-Aw
- Page 3: 3 • • • Introduction Phase lo
- Page 7 and 8: 7 V R Spectre RF Noise-Aware PLL Si
- Page 9 and 10: 9 PLL Model Extraction Flow • •
- Page 11 and 12: 11 September 17, 2007 PLL testbench
- Page 13 and 14: 13 Non-Linear VCO Modeling • •
- Page 15 and 16: 15 Effect of Noise and Perturbation
- Page 17 and 18: 17 SpectreRF’s PPV-based VCO Mode
- Page 19 and 20: 19 • • • Strengths of Spectre
- Page 21 and 22: 21 Using Spectre RF Noise-Aware PLL
- Page 23 and 24: 23 September 17, 2007 PPV versus tr
- Page 25 and 26: 25 PLL Noise-Aware Flow Experimenta
- Page 27 and 28: 27 Conclusions • • • • Cade
- Page 29 and 30: 29 References • • • • • [
4<br />
Challenges of <strong>PLL</strong> Simulation<br />
•<br />
f ref<br />
<strong>PLL</strong> are “stiff”<br />
–<br />
–<br />
Ref<br />
Div<br />
September 17, 2007<br />
f ref<br />
PFD CP LPF VCO<br />
circuits<br />
Divide by N<br />
Contain two widely-spaced time constants<br />
N * fref<br />
For wireless systems, the VCO often oscillates orders of<br />
magnitude faster than the reference frequency<br />
Out
Change language