A reference voltage driving circuit
A technology for driving circuits and reference voltages, applied in the direction of adjusting electrical variables, analog-to-digital converters, instruments, etc., can solve the problems of reducing set-up speed, high circuit power consumption, increasing chip pads and package pins, etc., to reduce power consumption. power consumption, good PSRR, and the effect of improving circuit performance
Active Publication Date: 2016-07-20
TSINGHUA UNIV
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Problems solved by technology
[0008] The present invention provides a reference voltage driving circuit to solve the problem that the existing solution adopts the off-chip capacitance method, which needs to add extra chip pads and packaging pins, introduces parasitic inductance to reduce the establishment speed, and when using large-size PMOS tubes The PSRR of the circuit is low, and the problem of excessive power consumption of the circuit will be caused when the reference voltage establishment speed is guaranteed
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[0018] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0019] The driving circuit of the reference voltage in this embodiment is realized by driving an open-loop branch with a closed-loop negative feedback loop. The closed-loop negative feedback loop provides an accurate initial reference voltage value, and the open-loop branch provides an output drive current to generate a reference voltage. see figure 2 , is a circuit diagram of a reference voltage driving circuit provided by an embodiment of the present invention, the driving circuit includes a closed-loop negative feedback loop and an open-loop branch, and the open-loop branch includes an NMOS transistor M31 and an NMOS transistor M32;
[0020] The drain of the NMOS transistor M31 is connected to the power supply VDD, the gate of the...
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The invention discloses a drive circuit of reference voltage. The drive circuit can achieve a good PSRR, increase the building speed of the reference voltage and reduce power consumption of the circuit. The drive circuit of the reference voltage comprises a closed-loop negative feedback loop and an open loop branch, wherein the open loop branch comprises an NMOS tube (M31) and an NMOS tube (M32), the drain electrode of the NMOS tube (M31) is connected with a power supply VDD, a first bias voltage provided by the closed-loop negative feedback loop is input into the grid electrode of the NMOS tube (M31), the source electrode of the NMOS tube (M31) outputs reference voltage Vrp, the drain electrode of the NMOS tube (M32) is connected with the source electrode of the NMOS tube (M31), a second bias voltage provided by the closed-loop negative feedback loop is input into the grid electrode of the NMOS tube (M32), the source electrode of the NMOS tube (M32) is grounded through an isolation electric device, and the source electrode of the NMOS tube (M32) outputs reference voltage Vrn.
Description
technical field [0001] The invention relates to the technical field of circuit development, in particular to a reference voltage driving circuit. Background technique [0002] ADC (Analog-to-Digital Converter, analog-to-digital conversion) technology converts analog signals into digital signals. Essentially, the function of the ADC is to output a digital code based on the comparison of the input analog signal and the input reference voltage. The error and noise of the reference voltage will be converted into the error of the output code, and the performance of the reference voltage directly affects the performance and accuracy of the ADC. For a 12-bit precision ADC device, the power supply voltage is 1.8V. If the reference voltage range is equal to the power supply voltage, the error and noise of the input reference voltage must be controlled within ±0.4mV. [0003] In practical scenarios, there are many factors that affect the performance of a voltage reference. For exam...
Claims
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IPC IPC(8): G05F1/56H03M1/12
Inventor 李福乐李玮韬杨昌宜王志华
Owner TSINGHUA UNIV