DS1851变容二极管的温度补偿

摘要： DS1851是一个双8位数字 - 模拟转换器（DAC ），其中还包含双独立40字节的查找表（LUT）和内部数字温度传感器。其原始应用程序的激光器（VCSEL）驱动程序中使用的偏置电路的温度补偿。此应用程序的简要介绍了如何使用该A / D转换器提供温度补偿的同一类型的变容二极管， RF电路中常用的可变电容器。

Application Note 1964
DS1851: Varactor Temperature
Compensation
www.maxim-ic.com

Varactor Characteristics
Varactors are diodes that exhibit large changes in capacitance when the reverse bias is varied. The capacitance of
a varactor decreases as the reverse bias is increased. A capacitance change ratio of greater than 5 is not
uncommon. See Figure 1 for a typical varactor voltage-capacitance characteristic.

Figure 1. Typical Varactor Voltage-Capacitance Characteristic


18.0

16.0