A Bandgap Reference Circuit with Current Compensation
A reference circuit and current compensation technology, which is applied in the field of bandgap reference circuits and bandgap reference circuits with current compensation, can solve problems such as high process requirements and complex circuit structure, and achieve low process stability requirements, low temperature coefficient, The effect of saving design cost
Active Publication Date: 2015-07-29
中科芯时代科技有限公司
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Problems solved by technology
[0004] In order to solve the above problems, the present invention provides a bandgap reference circuit with current compensation, which overcomes the shortcomings of VBE linearization method, exponential temperature compensation, piecewise linear compensation, resistance ratio method, high process requirements, and complicated circuit structure.
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[0020] In order to deeply understand the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0021] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.
[0022] See attached image 3 , the bandgap reference circuit with current compensation provided by the present invention includes a bandgap reference core circuit 1, a compensation current generating circuit 2 and a starting circuit 3, wherein,
[0023] Bandgap reference core circuit 1: used to generate a reference voltage for first-order compensation;
[0024] Compensation current generating circuit 2: used to generate the compensation current of bandgap reference core circuit 1, the current value is larger in the low temperature sec...
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The invention discloses a band-gap reference circuit with current compensation. The band-gap reference circuit comprises a band-gap reference core circuit, a compensation current generating circuit and a starting circuit. According to the reference circuit, on the basis of traditional first-order temperature compensation band-gap references, a current complementary to a first-order temperature compensation voltage curve is generated by the compensation current generating circuit and is converted into a voltage through a resistor R7, and the voltage and a voltage generated by the band-gap reference core circuit are superimposed and summed to generate a high-accuracy output voltage. According to the reference circuit, special processes are not required, and high-order compensation can be achieved by adding a small number of MOS tubes and resistors. The reference circuit has the advantages of being visual, simple and easy to understand and achieve.
Description
technical field [0001] The invention relates to a bandgap reference circuit, which belongs to the field of analog integrated circuits, in particular to a bandgap reference circuit with current compensation. Background technique [0002] With the rapid development of integrated circuits, bandgap references are widely used in analog, digital and digital-analog hybrid systems due to their good temperature stability, and their performance will directly affect the overall performance of the system, especially in high-precision of ADCs and DACs. In recent years, the accuracy of data conversion has been continuously improved, but the accuracy of the traditional first-order temperature-compensated bandgap reference source can only reach more than 10ppm, which is difficult to meet the design requirements of high-precision circuits. In order to obtain a higher-precision reference voltage, it is necessary to Perform high-order temperature compensation on it. [0003] Many high-order ...
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IPC IPC(8): G05F1/567
Inventor 姜伟赵野付佳郝炳贤杜晓伟
Owner 中科芯时代科技有限公司