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Method and apparatus for a brown out detector

A detector and connection technology, applied in the direction of pulse technology, electronic switch, pulse processing, etc., can solve the problems of unsupported, undervoltage with low ramp rate, zero static power consumption of the detector circuit, etc.

Active Publication Date: 2016-06-22
TEXAS INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a zero power solution, the detector circuit also needs to dissipate zero quiescent power
Most SoCs (system-on-chip) also do not support undervoltage conditions with lower ramp rates

Method used

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  • Method and apparatus for a brown out detector
  • Method and apparatus for a brown out detector
  • Method and apparatus for a brown out detector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] figure 1 A schematic diagram of a power on reset (POR) circuit 100 is shown. The POR circuit 100 is coupled to an integrated circuit 102 . The POR circuit 100 includes a power monitor 104 , a latch 106 , a startup circuit 108 , a brown-out detector 110 and an OR gate (OR gate) 112 . The brown-out detector 110 receives a power supply voltage VDD114.

[0015] A latch 106 is coupled across a start-up circuit 108 . OR gate 112 is coupled to brown-out detector 110 and to latch 106 . The power monitor 104 receives the power voltage VDD 114 and the output of the OR gate 112 . The integrated circuit 102 is coupled to a power monitor 104 .

[0016] explain now figure 1 operation of POR circuit 100 is shown. POR circuit 100 is used to detect power supply voltage VDD114. Start-up circuit 108 ensures that POR circuit 100 is activated when supply voltage VDD 114 is detected. Start-up circuit 108 provides a logic high (or logic '1') signal to OR gate 112 when supply voltage ...

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PUM

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Abstract

The disclosure provides a detector that includes a pre-charge circuit (416). The pre-charge circuit (416) receives a supply voltage (414). A pre-charged comparator (414) is coupled to the pre-charge circuit (416) and receives the supply voltage (414). The pre-charged comparator (420) generates a transition signal at a transition node (430). A slope of the transition signal is greater than a slope of the supply voltage (414). A first diode connected transistor (402) receives the supply voltage. A first capacitor is coupled to the first diode connected transistor (402). An inverter (410) is coupled to the first diode connected transistor (402) and generates an enable signal (412) when the supply voltage (414) is below a threshold voltage.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Patent Application No. 62 / 090,696, filed December 11, 2014, which is hereby incorporated by reference in its entirety. technical field [0003] The present application relates generally to low voltage detection circuits, and more particularly to a low power detector for detecting ultra-low brownout ramps. Background technique [0004] Power-on-reset (POR) circuitry is an integral part of mixed-signal devices. With the continuous push towards low-power analog circuits, zero-power POR is widely used in mixed-signal circuits. Zero-power PORs are extremely popular in circuits targeting low power consumption. On power-up, a digital state machine on an integrated circuit can be in an undefined state. It is important that the logic of this digital state machine is in a known state during power-up. A POR circuit is used to reset the digital state machine at power-up to ens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/22
CPCH03K5/19H03K17/223H03K5/2472
Inventor A·苏布拉玛尼安S·J·纳拉扬
Owner TEXAS INSTR INC