Resistance absolute value calibration circuit applied to floating high voltage
A technology for calibrating circuits and absolute values, which is applied in the direction of adjusting electrical variables, instruments, control/regulation systems, etc., can solve the problems of large circuit footprint and influence on integrated circuit circuit design, and achieve high-precision calibration of resistance deviation and optimized voltage control Interval, highly linear effects
Active Publication Date: 2020-04-10
3PEAK INC
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Problems solved by technology
The main problem of objectively analyzing the existing calibration circuit of this type is that the circuit occupies too much area, and even seriously affects the circuit design of the dominant function of the integrated circuit
At the same time, the switch of the adjustable resistor array needs to face high voltage that may exceed 100V, and the calibration circuit may face the risk of withstand voltage reliability
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[0016] The specific implementation of the present invention will be described in further detail below in conjunction with the accompanying drawings of the embodiments, so as to make the technical solution of the present invention easier to understand and grasp, so as to define the protection scope of the present invention more clearly.
[0017] The designer of the present invention aims at the design of the absolute value calibration circuit of the resistance applied to the floating high voltage in the prior art, there are many shortcomings that need to occupy a large amount of chip area in order to meet the high-precision adjustment, and at the same time the cost is high, and the circuit structure is synthesized. Analysis, combined with their own experience and creative labor, committed to seeking a breakthrough in the all-round optimization of the circuit performance, innovatively proposed a resistance absolute value calibration circuit applied to floating high voltage, optimi...
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The invention discloses a resistance absolute value calibration circuit applied to floating high voltage. The resistance absolute value calibration circuit comprises an Rc adjustable resistor which isconnected in parallel with a non-adjustable resistor R1 and is connected between floating high-voltage electrodes INA and INB. The Rc adjustable resistor is composed of a coarse adjustment resistor array and a fine adjustment resistor array; the coarse adjustment resistor array is formed by connecting N first-class resistors in parallel, the fine adjustment resistor array is formed by connectingM second-class resistors in parallel, each parallel branch is provided with a switch for switching in and switching off the resistor of the branch, N is a natural number larger than 6, and M is a natural number larger than 3. By applying the resistance calibration design, the circuit adopts a mode of combining rough adjustment and fine adjustment, high-linearity and high-precision calibration resistance deviation is realized, and the area ratio of a resistance array is greatly reduced; and meanwhile, the voltage control interval of the switch in resistance calibration is optimized, so that thecalibration circuit is continuously located in a safe working area, and the reliability of the device is met.
Description
technical field [0001] The invention relates to an optimized circuit design for resistance calibration, in particular to a resistance absolute value calibration circuit applied to floating high voltage. Background technique [0002] In integrated circuit design, high-precision calibration and optimization of resistors is an essential aspect that needs attention. The accuracy requirements for resistance calibration are increasing day by day, and the difficulty of corresponding circuit design is also increasing day by day. And when applied to floating high voltage, such as figure 1 As shown in the left half, the two floating high-voltage electrodes INA and INB are the two ends of the resistor R1, and the voltage difference between them is very large, even as high as 100V or more. The resistor R1 is a non-adjustable resistor, but its value has a deviation of plus or minus 20%. The main function of the Rc adjustable resistor is to calibrate the resistance deviation of the non...
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IPC IPC(8): G05F1/56
CPCG05F1/561
Inventor 吴建刚刘青凤
Owner 3PEAK INC