Output voltage adjustable band gap reference voltage circuit
A reference voltage and reference voltage output technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve problems such as inability to adjust the output value, and achieve the effect of ensuring the lowest drift
Inactive Publication Date: 2008-01-16
CHIPHOMER TECH SHANGHAI
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[0026] The disadvantage of the above-mentioned traditional bandgap reference circuit is that the output voltage of the reference is a certain value, and its output value cannot be adjusted according to different applications.
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[0047] The composition and working principle of the bandgap reference voltage circuit of the present invention will be described in more detail below in conjunction with the accompanying drawings and specific embodiments.
[0048] As shown in FIG. 3 is a schematic diagram of an embodiment of the present invention. Compared with the existing bandgap reference voltage circuit shown in FIG. 1 , this embodiment adds a voltage regulation configuration unit composed of R4 308 and R5 309 .
[0049] Specifically, as shown in FIG. 3 , the bandgap reference voltage circuit includes a reference voltage configuration unit as shown in FIG. 1 and a newly added voltage adjustment configuration unit. Wherein the reference voltage configuration unit includes a power supply Vcc for providing power supply for the circuit; a MOS transistor unit 301, the MOS transistor unit 301 includes an input terminal, an output terminal, and a control terminal, wherein the input terminal is connected to the pow...
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The invention discloses a belt gap reference voltage circuit which comprises a reference voltage configuration unit and a voltage regulating configuration unit; wherein the voltage regulating configuration unit comprises an input end, an output end and a first and a second regulating resistances which are cascaded with each other; wherein the output end is positioned between the first regulating resistance and the second regulating resistance; base electrodes of the first transistor unit and the second transistor unit are connected with each other; one end of the first regulating resistance and the second regulating resistance both of which are in tandem is connected with the reference voltage through the input end, and the other end of the first regulating resistance and the second regulating resistance both of which are in tandem is connected with the ground. The belt gap reference voltage circuit in the invention can regulate the proportion of the resistance so that different reference voltages are output; therefore, the reference voltage is guaranteed to lowest drift with temperature.
Description
technical field [0001] The present invention relates to analog electronic integrated circuits, in particular to a bandgap reference voltage circuit. Background technique [0002] A reference voltage source or a voltage reference (Voltage Reference) usually refers to a highly stable voltage source used as a voltage reference in a circuit. With the increasing scale of integrated circuits, especially the development of system integration technology (SOC), it has also become an indispensable basic circuit module in large-scale, VLSI and almost all digital and analog systems. Precise and stable voltage references are required in many integrated circuits and circuit units, such as digital-to-analog converters (DACs), analog-to-digital converters (ADCs), linear regulators, and switching regulators. In a digital-to-analog converter, the DAC selects and generates an analog output from a DC reference voltage based on the digital input signal presented at its input; in an analog-to-di...
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Inventor 余维学程剑涛王传芳
Owner CHIPHOMER TECH SHANGHAI