CSE 598 AEE 597 G Spring 2006 Cubic

CSE 598 A/EE 597 G Spring 2006 Cubic Function Generator Design Boram Lee, Jaehyun Lim Department of Computer Science and Engineering The Pennsylvania State University Mixed Signal Chip Design Lab

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

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

Cubic Function Generator § Design I out Vg T T Vg out T Mixed Signal Chip Design Lab

Cubic Function Generator § Design I out out T <low temperature> T <high temperature> T <linear term> out <pseudo cubic wave> T Mixed Signal Chip Design Lab

Cubic Function Generator § Design I Mixed Signal Chip Design Lab

Cubic Function Generator § Design II linear input square cubic wave cube Mixed Signal Chip Design Lab

Cubic Function Generator § Design II – voltage multiplier Mixed Signal Chip Design Lab

Cubic Function Generator § Design II – multiplier simulation result Mixed Signal Chip Design Lab

Cubic Function Generator § Design II – cubic function generator Mixed Signal Chip Design Lab

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

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

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

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 Mixed Signal Chip Design Lab

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 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 m. W Mixed Signal Chip Design Lab

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