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Cubic Function Generator Design

CSE598A/EE597G Spring 2006. Cubic Function Generator Design. Boram Lee, Jaehyun Lim Department of Computer Science and Engineering The Pennsylvania State University. Uncompensated crystal frequency. Frequency / Voltage. T. Compensated frequency of TCXO. Compensating voltage.

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Cubic Function Generator Design

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

  2. Uncompensated crystal frequency Frequency / Voltage T Compensated frequency of TCXO Compensating voltage Cubic Function Generator • Application • frequency compensation in TCXO

  3. Cubic Function Generator • Design I Cubic Functional Voltage Generator cubic term voltage conversion circuit (Low Temperature) cubic term voltage conversion circuit (High Temperature) Cubic Wave Temperature sensor ∑ linear term voltage conversion circuit

  4. out out Vg T T Vg out T out T Cubic Function Generator • Design I

  5. Cubic Function Generator • Design I out out out T T T <low temperature> <high temperature> <linear term> out <pseudo cubic wave> T

  6. Cubic Function Generator • Design I

  7. Cubic Function Generator • Design II linear linear input square cubic wave cube

  8. Cubic Function Generator • Design II – voltage multiplier

  9. Cubic Function Generator • Design II – multiplier simulation result

  10. Cubic Function Generator • Design II – cubic function generator

  11. Cubic Function Generator • Design II – cubic function generator layout voltage adder and amplifier voltage multipliers

  12. Cubic Function Generator • Design II – cubic function generator simulation results constant linear coefficient , various 3rd order coefficients

  13. Cubic Function Generator • Design II – cubic function generator simulation results various linear coefficient , constant 3rd order coefficients

  14. Cubic Function Generator • Design II – temperature stability 2.4 100 °C 1.6 1.2 0.8 0.4 -20 °C 2.0 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 -20 to 100°C temperature sweep

  15. Cubic Function Generator • Design II – temperature stability 2.0 1.5 1.0 1.4 1.5 1.6 1.7 1.8 1.9 2.0 after input adjustment

  16. 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. Cubic Function Generator • Future Plan and Suggestion • Full TCXO implementation and fabrication • temperature sensor • VCXO • programmable resistor bank

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