A low power consumption full MOS tube bandgap reference circuit and a converter based on it
A reference circuit and MOS tube technology, applied in the direction of instruments, adjusting electrical variables, control/regulation systems, etc., can solve the problems of complex circuits and high power consumption of circuits, and achieve simplified circuit structure, low power consumption, and low power consumption Effect
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Embodiment 1
[0039] A low-power full MOS tube bandgap reference circuit, including a mirrored NMOS tube, a mirrored PMOS tube that lowers the branch current to make the mirrored NMOS tube work in the sub-threshold region, a second NMOS tube NM2 that converts the current into a voltage, and converts the voltage The fifth NMOS transistor NM5 converted into current and the MOS transistor group that provides bias for the second NMOS transistor NM2 and the fifth NMOS transistor NM5 to work in the linear region;
[0040] The mirrored PMOS transistor, the mirrored NMOS transistor and the fifth NMOS transistor NM5 are connected to generate a current that has nothing to do with the power supply. The current flows into the second NMOS transistor NM2 through the mirrored PMOS transistor and is converted into a voltage. The second NMOS transistor NM2 is connected to the third NMOS transistor in the mirrored NMOS transistor. The NMOS transistor NM3 is connected to realize the superposition of the positi...
Embodiment 2
[0093] Based on Embodiment 1, the specific circuit schematic diagram is connected as follows:
[0094] The mirrored PMOS transistor includes a third PMOS transistor PM3 and a fourth PMOS transistor PM4, the third PMOS transistor PM3 and the fourth PMOS transistor PM4 adopt an inverse ratio transistor, the mirrored NMOS transistor includes a third NMOS transistor NM3 and a fourth NMOS transistor NM4, and the mirrored PMOS transistor The circuit connections of the tube, the mirrored NMOS tube, the second NMOS tube NM2, and the fifth NMOS tube NM5 are as follows:
[0095] The source of the third PMOS transistor PM3 is connected to VDD, its gate is connected to the gate of the fourth PMOS transistor PM4, its drain is connected to the drain of the second NMOS transistor NM2, and the reference voltage V ref ; The source of the second NMOS transistor NM2 is connected to the gate and drain of the third NMOS transistor NM3, and the source of the third NMOS transistor NM3 is connected t...
Embodiment 3
[0102] Based on Embodiment 2, the bandgap reference circuit of the present application can be applied to converters, the details are as follows:
[0103] An analog-to-digital converter, comprising a full MOS tube bandgap reference circuit, the full MOS tube bandgap reference circuit includes a mirrored NMOS tube, a mirrored PMOS tube that lowers the branch current to make the mirrored NMOS tube work in a sub-threshold region, and converts the current The second NMOS transistor NM2 converted into voltage, the fifth NMOS transistor NM5 converted from voltage into current, and the MOS transistor group that provides bias for the second NMOS transistor NM2 and the fifth NMOS transistor NM5 to work in the linear region;
[0104] The mirrored PMOS transistor, the mirrored NMOS transistor and the fifth NMOS transistor NM5 are connected to generate a current that has nothing to do with the power supply. The current flows into the second NMOS transistor NM2 through the mirrored PMOS tran...
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