典型BCD工艺不支持高精度、低温度系数的电阻,在将电压源转换为恒流源时温度特性较差。利用差分温度检测电路,提出一种新颖的温度补偿方法,可在高温段和低温段产生补偿电流,与基本恒流源电流叠加,可有效降低温度系数。基于HHNEC 0.35μm BCD工艺,对电路进行仿真,结果表明,补偿后的32μA恒流源在-40℃～85℃温度范围内、各工艺角下的电流温度系数均小于8×10-6/℃。 Typical BCD processes do not support high accuracy, low temperature coefficient resistors, and poor temperature characteristics when converting a voltage source to a constant current source. By using the differential temperature detection circuit, a novel temperature compensation method is proposed, which can generate compensation current in high temperature and low temperature, which can be superposed with the basic constant current source current to reduce the temperature coefficient effectively. Based on the HHNEC 0.35μm BCD process, the simulation results show that the current temperature coefficient of each compensated 32μA constant current source is less than 8 × 10-6 / ℃ .