Low-temperature-coefficient full-MOS type current source circuit with technological compensation
A low temperature coefficient, compensation circuit technology, applied in the field of current sources, can solve the problems of output current variation, unsatisfactory output current value temperature characteristics, resistance temperature characteristics difficult to accurately compensate for negative temperature characteristics, etc., to achieve small process deviation, temperature coefficient and so on. Low, lower temperature coefficient effect
Active Publication Date: 2018-08-03
HUNAN UNIV
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Problems solved by technology
However, in the integrated circuit manufacturing process, the resistance value of the resistor changes greatly due to process fluctuations, which will cause a large change in the actual output current. At the same time, it is difficult for the temperature characteristics of the resistor to accurately compensate for the negative temperature characteristics introduced by transistors other than resistors. Causes unsatisfactory temperature characteristics of the output current value
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[0035] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms without being limited by the embodiments set forth herein.
[0036] Such as Figure 2 to Figure 5 As shown, a full MOS current source circuit with secondary compensation includes a start-up circuit 1 , a process compensation bias circuit 2 , a reference current generating circuit 3 , and a secondary compensation circuit 4 .
[0037] Wherein, the input port 5 of the starting circuit is connected with the first output port 11 of the reference current generating circuit, the output port 6 of the starting circuit is connected with the second input port 10 of the reference current generating circuit, and the first output port 7 of the bias circuit is connected with the reference ...
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The invention provides a low-temperature-coefficient full-MOS type current source circuit with technological compensation. The circuit comprises a startup circuit, a technological compensation biasingcircuit, a reference current generating circuit and a two-stage compensation circuit. Through the technological compensation biasing circuit, the influences of technological deviation on a sub-threshold reference current generating circuit are reduced; meanwhile, through the two-stage compensation circuit, a low temperature coefficient is obtained. The full-MOS type current source circuit has theadvantages of being low in technological deviation, low in temperature coefficient, simple in structure, free of resistance, free of dual-polarity type transistors and the like; the full-MOS type current source circuit is suitable for a reference current source circuit.
Description
technical field [0001] The invention relates to the field of current sources, in particular to an all-MOS type current source circuit with process compensation. Background technique [0002] A current source is a fundamental construct in many circuits, both to provide a constant bias current to a circuit and to act as an active load to an amplifier. figure 1 As shown, it is a traditional current source circuit structure, the resistor R0 determines the current value of the current source, and provides a certain temperature compensation at the same time. Commonly used resistor types include diffused resistors, polysilicon resistors, etc. However, in the integrated circuit manufacturing process, the resistance value of the resistor changes greatly due to process fluctuations, which will cause a large change in the actual output current. At the same time, it is difficult for the temperature characteristics of the resistor to accurately compensate for the negative temperature ch...
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Login to View More IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 陈卓俊张仁梓卢谆陈迪平胡袁源
Owner HUNAN UNIV