A Reference Voltage Source Circuit Structure Suitable for Image Sensors
A reference voltage source, image sensor technology, applied in instruments, regulating electrical variables, control/regulating systems, etc., can solve problems such as large size, change, thermal noise, etc., to reduce small signal impedance, eliminate the influence of temperature coefficient, The effect of eliminating the bias circuit
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[0054] The technical problem to be solved by the present invention is mainly to propose a reference voltage source circuit applied to a CIS chip under the double-well CMOS process, the purpose is to further improve the noise and PSRR characteristics of the internal reference voltage of the chip system, and reduce or eliminate as much as possible the noise in the imaging system. In the system, due to the noise introduced by the reference voltage current.
[0055] The invention is improved based on the structure of the conventional first-order bandgap reference voltage source. The general working principle of the conventional structure is to subtract the voltage difference between the positive and negative terminals of a resistor R1 from the voltage of the two PN junctions, thereby generating a PTAT current proportional to the temperature; and then mirroring the current to another output branch, where On the branch, the PTAT current flows through a resistor R2 to generate a PTAT...
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