1. Mixed Signal Chip Design Lab Cubic Function Generator Design Boram Lee, Jaehyun Lim Department of Computer Science and Engineering The Pennsylvania State University CSE598A/EE597G Spring 2006

2. Mixed Signal Chip Design Lab Cubic Function Generator  Application frequency compensation in TCXO Frequency / Voltage T Uncompensated crystal frequency Compensated frequency of TCXO Compensating voltage

3. Mixed Signal Chip Design Lab Cubic Function Generator  Design I cubic term voltage conversion circuit (Low Temperature) cubic term voltage conversion circuit (High Temperature) linear term voltage conversion circuit ∑ Cubic Wave Temperature sensor Cubic Functional Voltage Generator

4. Mixed Signal Chip Design Lab Cubic Function Generator  Design I out T T VgVg T VgVg T

5. Mixed Signal Chip Design Lab Cubic Function Generator  Design I out TT T T

6. Mixed Signal Chip Design Lab Cubic Function Generator  Design I

7. Mixed Signal Chip Design Lab Cubic Function Generator  Design II linear inputsquare cube linear cubic wave

8. Mixed Signal Chip Design Lab Cubic Function Generator  Design II – voltage multiplier

9. Mixed Signal Chip Design Lab Cubic Function Generator  Design II – multiplier simulation result

10. Mixed Signal Chip Design Lab Cubic Function Generator  Design II – cubic function generator

11. Mixed Signal Chip Design Lab Cubic Function Generator  Design II – cubic function generator layout voltage multipliers voltage adder and amplifier

12. Mixed Signal Chip Design Lab Cubic Function Generator  Design II – cubic function generator simulation results constant linear coefficient, various 3rd order coefficients

13. Mixed Signal Chip Design Lab Cubic Function Generator  Design II – cubic function generator simulation results various linear coefficient, constant 3rd order coefficients

14. Mixed Signal Chip Design Lab Cubic Function Generator  Design II – temperature stability -20 to 100°C temperature sweep 0.4 0.8 1.2 1.6 2.4 2.0 1.31.51.71.91.41.61.82.0 100 °C -20 °C

15. Mixed Signal Chip Design Lab Cubic Function Generator  Design II – temperature stability after input adjustment 1.0 1.5 2.0 1.51.71.91.41.61.82.0

16. Mixed Signal Chip Design Lab Cubic Function Generator  Design II – design summary technology: TSMC 0.35 μm supply: 3.3 volt single supply core size: 97.3 μm X 111.6 μm input range: 1.3 ~ 2.0 V power: 22 mW

17. Mixed Signal Chip Design Lab Cubic Function Generator  Future Plan and Suggestion Full TCXO implementation and fabrication – temperature sensor – VCXO – programmable resistor bank