Current reference circuit capable of outputting multiple temperature coefficients
A technology of temperature coefficient and current reference, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., can solve the problems of complex structure and high power consumption, and save current branches, power consumption, and number of tubes. Effect
Active Publication Date: 2021-06-29
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology
[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] Such as 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 ...
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The invention discloses a current reference circuit capable of outputting multiple temperature coefficients and belongs to the technical field of analog integrated circuits. The circuit comprises a positive temperature coefficient (PTAT) current generating circuit, a negative feedback loop, a negative temperature coefficient (CTAT) current generating circuit, a multi-temperature coefficient current generating circuit and a starting circuit, and is characterized in that the multi-temperature coefficient current generating circuit comprises a positive temperature coefficient (PTAT) current generating circuit, a negative feedback loop, a negative temperature coefficient (CTAT) current generating circuit, a multi-temperature coefficient current generating circuit and a starting circuit. By means of linear superposition of PTAT current and CTAT current, the current reference source with various temperature coefficients can be obtained by adjusting the proportionality coefficient, and requirements of various different circuits can be met. A negative feedback loop in the PTAT current generating circuit is directly used for a current mirror structure of a triode, the number of transistors used in the circuit is effectively reduced, and the PTAT current generating circuit is suitable for low power supply voltage power supply; in addition, a negative feedback loop in the PTAT current generation circuit is also directly applied to the CTAT current generation branch instead of two independent structures, so the number of current branches in the circuit is effectively reduced, the area is saved, and power consumption is reduced.
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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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 ELECTRONIC SCI & TECH OF CHINA