一种基于JFET差分输入对的电压基准源设计

Design of a voltage reference based on JFET differential input pair

摘要: 采用4 μm 40 V BJT商用工艺设计了一种基于JFET差分输入对的2.5 V电压基准源.内部结构包括JFET差分输入对、恒流源、PTAT电流源、运放、电阻分压器、短路保护.仿真结果表明本设计能够满足5 V~30 V宽电压范围、车规级温度范围应用，并具有低噪声、低温漂、低温度非线性等卓越性能.

Abstract: Fabricated by 4 μm 40 V BJT commercial technology, a designed voltage reference based on JFET differential input pair outputs 2.5V steadily, which is comprised of JFET differential input pair, constant current source, PTAT current source, op-amp, resistor divider, short-circuited protection. Simulation results show that the design lends itself well to a wide range of voltage application (5 V~30 V) and vehicle-level temperature application. Besides, low noise, low temperature drift, low temperature nonlinearity could also be expected.