Low temperature drift precision current generation circuit
A technology for generating circuits and low-temperature drift, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as increasing errors, achieve the effects of reducing temperature drift, easy mass production and adjustment, and reducing implementation costs
Active Publication Date: 2018-01-23
SG MICRO
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Problems solved by technology
Trimming is realized by changing the absolute value of the current source. Although this reduces the temperature drift of the output current Iout, it increases the error at normal temperature
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[0018] Below with the accompanying drawings ( Figure 1-Figure 3 ) to illustrate the present invention.
[0019] figure 1 It is a schematic diagram of the structure and principle of the low-temperature drift precision current generating circuit implemented in the present invention. figure 2 It is a schematic diagram of the structure and principle of the current control current source. image 3 It is a schematic diagram of the structure principle of the reference current source. Such as Figure 1 to Figure 3 As shown, the low-temperature drift precision current generation circuit includes a current-controlled current source CCCS with four ports, where the first port 1 and the third port 3 are both connected to the first power access line pwr1, and the second port 2 is connected to the reference current The source Iref is connected to the first trimming current source I1 to form a reference current node iref, the fourth port 4 is divided into two paths, one path is connecte...
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Provided is a low-temperature-drift precise current generating circuit. Errors at normal temperature can be not increased while temperature drift is reduced, mass production trimming on temperature compensation becomes easier, on-chip integrated resistor resources can be better utilized, and then the implementation cost of a low-temperature-drift precise current source can be reduced. The low-temperature-drift precise current generating circuit is characterized in that a current control current source with four ports is included, wherein the first port and the third port are both connected with a first power supply access line, the second port is connected with a reference current node formed by connecting a reference current source with a first trimming current source, the fourth port is divided into two ways, one way is connected with the first power supply access line through a second trimming current source, the other way is connected with the low-temperature-drift precise current output end, and the reference current node is connected with the first power supply access line through the first trimming current source and connected with a second power supply access line through the reference current source.
Description
technical field [0001] The invention relates to low-temperature drift current source technology in chip circuits, in particular to a low-temperature drift precision current generating circuit, which is beneficial to reduce the temperature drift without increasing the error at normal temperature, so that the temperature compensation can be mass-produced and adjusted. Easier and better use of on-chip integrated resistor resources, thereby reducing the implementation cost of low-temperature drift precision current sources. Background technique [0002] The low-temperature drift current source is a basic circuit component widely used in chip design. For example, it can be used as a reference source for a current-mode DAC, a design component for a relaxation oscillator, and an excitation source for a temperature sensor. The temperature stability of the current source determines the temperature stability of the above application circuit, so improving the temperature stability of t...
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IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 林毅竟刘菁
Owner SG MICRO