A reference current source with low temperature coefficient and low power supply voltage coefficient, which is characterized in that the reference current source comprises a start-up circuit and a constant current generation circuit, which generates a low voltage starting circuit, the constant current generation circuit, the starting circuit includes: (1) a PMOS tube (M: 3), is used to generate the current mirror, the source electrode is connected with an external power supply at the same time, gate and NMOS (M: s) and the drain of the constant current generation circuit is connected to the output end of the drain pipe and NMOS (M: 5) and the drain the gate is connected; (2) two NMOS (M: 4 and M: 5), for a current mirror, to produce two current, two NMOS (M: 4 and M: \ 5) the grounded source, connected to the gate, and connect to the NMOS tube (M: 5) the drain pipe, NMOS (M: 4) connected to the drain end of the resistor is Rs; (3) a NMOS tube (M: s). Used to start a constant current generation circuit, the gate at the same time and end resistance Rs and NMOS (M: 4) the drain is connected to the grounded source; (4) resistance Rs, for control of NMOS (M: s) the turn-on and turn off the end with the outside the power supply is connected; the constant current generating circuit includes: (5) two PMOS (M: 1 and M: 2), for a current mirror, to produce two current (I: 1, I: 2); two PMOS tube is connected with the external power source, the grid interconnection, and connected to the operational amplifier (O: 1) the output end of the capacitor; (6) (C: 0), used to prevent the parasitic oscillation circuit, one end of the capacitor is PMOS tube (M: 1) the drain is connected, and the other end of the gate amplifier with two PMOS tube (O: 1) is connected to the output terminal of the bipolar transistor (7); PNP (Q: 1 and Q: 2), for generating two emitter junction voltage (V: BE1, V: BE2), the PNP Q down 1 bipolar transistor collector and base circuit, the emitter and the PMOS tube (M: 1) the drain, At the same time with the operational amplifier (O: 1) is the reverse side, PNP bipolar transistor Q down 2 emitter by resistance (R: 0) and PMOS (M: 2) the drain is connected with operational amplifier (O: 1) is the same to the end; (8) operational amplifier (O: 1), for differential amplification of V1 and V2, where V1 is the PNP bipolar transistor (Q: 1) the emitter voltage drop, V2 PNP bipolar transistor (Q: 2) and resistance (emitter junction voltage drop R: 0) the voltage drop and; (9) resistance (R: 1, R: 2), for the resistance compensation circuit, resistor (R: 1) the other end is grounded. The operational amplifier (O: 1) the reverse side resistance (R: 2) at one end of the ground, the other end is connected with the operational amplifier (O: 1) the same to the end.
【技术实现步骤摘要】
本专利技术涉及一种低温度系数和低电源电压系数的参考电流源,属电源
技术介绍
电流参考电路是模拟集成电路中的重要部件。因为,对电流来说,在长金属线上没有损失,而电压则有损失,所以在有长金属线的复杂模拟电路中,电流参考源更受欢迎。另外,电流模方法设计的模拟电路比电压模的电路的工作频率要高。因此,在现代电子电路和系统中,参考电流源有广泛的用途。由于现代电子系统的应用范围很广,环境更苛刻,因此要求参考电流源在很宽的温度范围(-25℃~125℃)和很宽的电源电压范围电路都能可靠地工作。在已有技术中一般采用能隙电路来实现恒压源(参考电压源),如K.N.Leung,P.K.T.Mok.A sub-1-V15-ppm/℃ CMOS bandgap voltage reference without requiring low threshold voltagedevice.IEEE Journal of Solid-State Circuits.2002,37(4)526~530。
技术实现思路
本专利技术的目的是提出一种低温度系数和低电源电压系数的参考电流源,采用能隙电路来实现恒流源。本专利技术提出的低温度系数和低电源电压系数的参考电流源,包括一个启动电路和一个恒电流产生电路,其中启动电路产生一个低电压,使恒电流产生电路工作;其中的启动电路包括(1)一个PMOS管(M3),用于产生镜像电流,其源极与外接电源相接,栅极同时与NMOS管(Ms)的漏极和恒电流产生电路的输出端相连,漏极与NMOS管(M5)的漏极和栅极相连;(2)两个NMOS管(M4和M5),用于构成 ...
【技术保护点】
【技术特征摘要】
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