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Positive temperature current generating circuit

A technology for generating circuits and currents, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., to achieve the effect of improving the power supply rejection ratio, saving system power consumption, and saving circuit area

Active Publication Date: 2021-12-03
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the core design principles of circuits with temperature characteristics are relatively simple,

Method used

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Example Embodiment

[0011] Below in conjunction with accompanying drawing, the technical scheme of the present invention is described in detail:

[0012] The schematic diagram of the traditional PTAT current source generation circuit is as follows figure 1 As shown, the principle of PTAT current generation is:

[0013]

[0014] The problems existing in this circuit are discussed below. The first is the problem of the degeneracy point. Since the circuit has a degeneracy point, when the enable control signal EN1 is valid, the circuit has no current path from the power rail VCC to the ground, and the circuit cannot start automatically. Additional startup circuitry needs to be added. Increased circuit complexity and system power consumption. Secondly, the transistor QN3 and the transistor QN4 are on both sides of the branch respectively. The currents passing through the two transistors are not completely equal, and the power supply noise and interference signals can be reflected to the current I...

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Abstract

The invention belongs to the technical field of power management, and particularly relates to a positive temperature current generating circuit. The positive temperature current generating circuit realizes self-starting in a state that the enable control signal is effective, gets rid of a degenerate state, avoids the use of an additional starting circuit, and saves the power consumption of a system and the area of the circuit. In addition, the designed positive temperature current generating circuit isolates the noise influence of the power supply voltage, and the power supply rejection ratio of the circuit and the accuracy of temperature detection are improved.

Description

technical field [0001] The invention belongs to the technical field of power supply management, and in particular relates to a positive temperature current generating circuit. Background technique [0002] Temperature is a factor that needs to be considered in chip design. At different temperatures, device characteristics are different, resulting in different working states of the chip system. The limit is that at low temperature or high temperature, the working state of the chip may be abnormal. If the relevant temperature detection and over-temperature protection circuit cannot be added in the design, the chip may be damaged. [0003] Now an important part of chip design is to design high-precision temperature detection circuit and over-temperature protection circuit. The design core of the high-precision temperature detection circuit is to generate more accurate positive temperature coefficient (PTAT) voltage, current and negative temperature coefficient (CTAT) voltage a...

Claims

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Application Information

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IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 周泽坤李世磊龚州王卓张波
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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