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Apparatus and methods for adaptive trip point detection

A trip and detector technology, applied in pulse technology, instant pulse conveying devices, electronic switches, etc., can solve problems such as POR circuit failure

Active Publication Date: 2010-12-08
SANDISK TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Likewise, if the threshold voltage V TP and V TN Both are high (for example, V TN =V TP = 1.7 volts, and therefore V REF = 3.4 volts), then X HI may never change state, and therefore the POR circuit will fail

Method used

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  • Apparatus and methods for adaptive trip point detection
  • Apparatus and methods for adaptive trip point detection
  • Apparatus and methods for adaptive trip point detection

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[0079] Table 7

[0080] now refer to Figure 13 with 14 , the operation of the trip point detector circuit 12d is illustrated for fast process or high temperature conditions that may result in a low threshold voltage. In this example, V TN =V TP = 0.6 volts, V TNH = 0.8 volts, x FAST is low and FAST is high. Thus, transistor 18 is effectively switched out of the circuit and transistor 18F is effectively switched in. At t=0, V 33 =0 volts, transistor 16 is off, V x = 0 volts, transistor 18F is off, and X HI equal to V 33 = 0 volts. When 01 ′, V 33 increases, but remains at V TP the following. Therefore, transistor 16 remains off, Vx=0, and X HI =V 33 . at t=T 1 ′, V 33 With threshold voltage V TP beyond V x , and transistor 16 thus begins conducting. When T 1 '5 , Vx remains below V 33 a V TP . Since V X less than V TNH , so transistor 18F remains off, and X HI =V 33 . at t=T 5 when V 33 =V TP +V TNH , V x =V TNH , and transistor 18F...

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Abstract

Apparatus and methods are described for providing an adaptive trip point detector circuit that receives an input signal at an input signal node and generates an output signal at an output signal node, the output signal changing from a first value to a second value when the input signal exceeds a trip point reference value. In particular, the trip point reference value is adjusted to compensate for variations in process or temperature, without requiring an externally-supplied reference signal.

Description

technical field Background technique [0001] Most electronic circuits (eg, integrated circuits) receive power from an external power supply. For example, an electronic system may include a power supply (e.g., V 33 ). At system startup, V 33 It can start at an initial value (eg, 0 volts) and then increase to its full scale value (eg, 3.3 volts). However, many integrated circuits contain chip configuration circuits or other circuits that require a minimum supply voltage (eg, 1.5 volts) for normal operation. If a power supply signal smaller than the stated minimum is applied to such configuration circuits, the chip may not operate properly. Therefore, many integrated circuits use a power-on-reset (“POR”) circuit to sense the voltage level of the power supply signal and generate an indication of the V 33 Control signal when the minimum supply voltage is exceeded. [0002] To accomplish this task, a POR circuit typically compares the supply signal with a reference signal hav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K17/22
CPCH03K17/145H03K17/223H03K5/153H03K17/00H03K17/22
Inventor 泰勒·索普马克·约翰逊布伦特·豪克内斯
Owner SANDISK TECH LLC