High-precision correcting circuit for band-gap reference voltage source
A reference voltage source, reference source technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problems of unchangeable output reference, high cost, affecting the accuracy of the reference source, etc., to achieve flexible calibration, high precision, small area effect
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[0013] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments, so as to obtain a better understanding.
[0014] figure 1 As shown, it is a commonly used bandgap reference voltage source core circuit, which is used to generate a reference voltage V BG , theoretical analysis can draw the reference voltage V when the temperature coefficient is zero BG ≈1.25V, but due to the influence of process angle, offset, temperature and other factors, the reference voltage value will produce errors. In order to eliminate the errors generated by the reference voltage, it is necessary to design a correction circuit to correct the reference voltage to near the ideal value. Through reasonable design and monte carlo simulation of this circuit, the simulation can show that the output reference voltage is between 1.1V-1.3V. The present invention needs to generate a reference voltage of 1.2V, so it is necessary...
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