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voltage tracking circuit

A technology for tracking circuits and voltages, applied in the direction of adjusting electrical variables, electrical signal transmission systems, signal transmission systems, etc., can solve problems such as errors and unacceptable tracking, and achieve the effect of avoiding current changes

Active Publication Date: 2015-12-09
NAN YA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current I flowing through the transistor Mtrack (or from drain to source) fb will not follow the current I flowing through the transistor MPG ds changes with changes, so the current I fb Variations (due to PVT variation) may cause the voltage V gs and voltage V t significantly different from each other, leading to the problem of unacceptable tracking error

Method used

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Embodiment Construction

[0072] figure 2 It is a schematic diagram of a voltage tracking circuit 2 according to an embodiment of the present invention. refer to figure 2 As shown, the voltage tracking circuit 2 is used to connect a voltage limiter (voltage limiter) 3 . The voltage tracking circuit 2 may include an operational amplifier 22 , a voltage generator 23 and a diode-connected device 24 . The device 24 connected in diode form and the voltage limiter 3 can have the same threshold voltage (threshold voltage) V t . The diode-connected device 24 is disposed on a feedback loop 220 of the operational amplifier 22 , wherein the feedback loop 220 extends from the voltage generator 23 to an input terminal of the operational amplifier 22 . The operational amplifier 22 can accept a fixed voltage V1 and provide a voltage to the voltage generator 23, so that the voltage generator 23 can correspondingly generate a voltage V gate , where the voltage V gate can be approximately equal to the voltage V ...

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Abstract

A voltage tracking circuit, which comprises a voltage generating device, a first operational amplifier, a first voltage generator, and a diode-connected device. The voltage generating device provides a fixed voltage. The first operational amplifier has a first input terminal that can receive the fixed voltage, a second input terminal that is coupled with a protected device model, and an output terminal. The first voltage generator connects to the output terminal of the first operational amplifier and to a voltage limiter that is coupled with devices under protection. The diode-connected device is in a feedback loop that connects the second input terminal of the first operational amplifier to the first voltage generator.

Description

technical field [0001] The invention relates to a voltage tracking circuit. Background technique [0002] Semiconductor devices with thin oxide layers have reliability problems when gate-to-source voltages are too high. Therefore, pass transistors are generally used as voltage limiters to protect these semiconductor devices. However, this voltage limiter also has timing and performance concerns if the gate voltage is not high enough. In order to reduce the influence of these hidden worries, a threshold voltage tracking voltage generator (threshold voltage tracking voltage generator) will be used to limit the voltage even if the voltage limiter is affected by PVT (process (process), voltage (voltage) and temperature (temperature)) variation. tor can have a fixed maximum voltage. [0003] figure 1 is a traditional threshold voltage (V t ) traces voltage generator 1. V t The tracking voltage generator 1 has an operational amplifier 11 . The positive input terminal of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
CPCG05F1/563Y10T307/406
Inventor 褚炜路刘斌
Owner NAN YA TECH