A current reference circuit with multiple output temperature coefficients
A temperature coefficient and current reference technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problems of large power consumption and complex structure, and achieve the effects of reducing power consumption, saving current branches, and saving area
Active Publication Date: 2022-03-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0004] Aiming at the various performance requirements, complex structure and high power consumption of the above current reference source, the present invention proposes a current reference circuit that outputs multiple temperature coefficients
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[0025] Below in conjunction with accompanying drawing and specific embodiment, describe technical solution of the present invention in detail:
[0026] The invention proposes a current reference circuit that outputs multiple temperature coefficients, including a start-up circuit, a PTAT current generating circuit, a negative feedback loop, a CTAT current generating circuit, and multiple temperature coefficient current generating circuits.
[0027] like Figure 5 As shown, the start-up circuit includes a third NPN transistor Q 3 , the fourth resistor R 4 , the seventh N-type MOS tube M 7 , the third NPN transistor Q 3 The base of the second NPN transistor Q 2 base of the third NPN transistor Q 3 The emitter is grounded, the third NPN transistor Q 3 The collector is connected to the fourth resistor R 4 One end of the fourth resistor R 4 The other end of the power supply voltage; the seventh N-type MOS tube M 7 The gate and the drain are connected together, connected to ...
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The invention discloses a current reference circuit outputting multiple temperature coefficients, which belongs to the technical field of analog integrated circuits. It includes a positive temperature coefficient (PTAT: proportional to absolute temperature) current generating circuit, a negative feedback loop, a negative temperature coefficient (CTAT: complementary to absolute temperature) current generating circuit, multiple temperature coefficient current generating circuits, and a start-up circuit. Using the linear superposition of PTAT current and CTAT current, by adjusting the proportional coefficient, a current reference source with various temperature coefficients can be obtained, which can meet the needs of various circuits. The negative feedback loop in the PTAT current generating circuit is directly used in the current mirror structure of the triode, which effectively reduces the number of transistors used in the circuit and is suitable for low power supply voltage; the negative feedback loop in the PTAT current generating circuit is also directly used On the CTAT current generation branch, instead of two independent structures, the current branch in the circuit is effectively reduced, the area is saved, and the power consumption is saved.
Description
technical field [0001] The invention belongs to the technical field of analog integrated circuits, and in particular relates to a current reference circuit which outputs multiple temperature coefficients. Background technique [0002] Reference source circuits play an important role in the design of analog integrated circuits and are widely used in various chips, such as digital-to-analog converters, power management chips, sensor chips, and detection chips. The reference source circuit is a very important structure in many circuits, and the performance of the circuit system is directly affected by the accuracy and stability of the current reference source. In addition to the commonly used zero temperature coefficient voltage reference source, the current reference is also very important in analog integrated circuit design. Since current is not lost on long metal wires, but voltage is, current references are preferred in analog circuits with more complex layouts. [0003] ...
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IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 张有润赵乙蔷程雨凡康仕杰章登福李逸康甄少伟张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA