A bias current generating circuit
A technology for generating circuits and bias currents, applied in the direction of adjusting electrical variables, instruments, control/regulation systems, etc., can solve problems such as bias current changes, and achieve the effect of satisfying high precision
Active Publication Date: 2018-09-14
深圳市广联智通科技有限公司
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[0004] In order to solve the technical problem that the bias current generated by the bias current generating circuit in the existing bipolar process has a large change with the change of the power supply voltage, the present invention provides a bias current that produces a small current change with the power supply voltage generating circuit
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[0011] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.
[0012] In order to solve the technical problem that the bias current generated by the bias current generating circuit in the existing bipolar process has a large change with the change of the power supply voltage, the present invention provides a bias current that produces a small current change with the power supply voltage Generate the circuit. Such as figure 1 As shown, the circuit includes: first resistor R1, second...
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The invention provides a bias current generating circuit and belongs to the technical field of semiconductor integrated circuitry. The bias current generating circuit comprises first resistor R1, second resistor R2, third resistor R3, first PNP triodes P1, second PNP triodes P2, third PNP triodes P3, first NPN triodes N1, second NPN triodes N2, and third NPN triodes N3; the number of the first NPN triodes is N times the number of the second NPN triodes, and N is an integer greater than or equal to 2. As the first NPN triodes N1 are different from the second NPN triodes N2 in quantity, their bases and emitters also have different voltage differences; the voltage differences give rise to a current which is completely irrelevant to voltage of a power supply; the current is provided for other modules. To sum up, the current generated by the bias current generating circuit is completely irrelevant to the voltage of the power supply, and the requirement on high system precision can be met.
Description
technical field [0001] The invention belongs to the technical field of semiconductor integrated circuits, and in particular relates to a bias current generation circuit. Background technique [0002] Bias current is an important reference source in analog integrated circuits and is an indispensable part of the system. [0003] Currently, the bias current generating circuits in the bipolar process have great changes with the change of the power supply voltage. In many integrated circuit modules that require high precision, a bias current that varies as little as possible with the power supply voltage is required. Traditional bias current generation circuits can no longer meet the requirements of high-precision systems. Contents of the invention [0004] In order to solve the technical problem that the bias current generated by the bias current generating circuit in the existing bipolar process has a large change with the change of the power supply voltage, the present inv...
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IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 赵建宾其他发明人请求不公开姓名
Owner 深圳市广联智通科技有限公司