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Voltage tracking circuit

A technology for tracking circuits and voltages, applied to electrical components, adjusting electrical variables, instruments, etc., can solve problems such as errors and unacceptable tracking, and achieve the effect of avoiding current changes

Active Publication Date: 2014-11-05
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 the voltage tracking circuit 2 according to an embodiment of the present invention. Reference figure 2 As shown, the voltage tracking circuit 2 is used to connect a 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 and the voltage limiter 3 connected in the form of a diode may have the same threshold voltage V t . The device 24 connected in the form of a diode is arranged 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 receive a fixed voltage V1 and provide a voltage to the voltage generator 23 so that the voltage generator 23 can generate a voltage V accordingly gate , Where the voltage V gate Approximately equal to voltage V 1 And the sum of the threshold vo...

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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] When the gate to source voltages are too high, a semiconductor device with a thin oxide layer may have reliability problems. Therefore, pass transistors are usually used as voltage limiters to protect these semiconductor devices. However, if the gate voltage is not high enough, this voltage limiter will also have timing and performance concerns. In order to reduce the influence of these hidden worries, a threshold voltage tracking voltage generator will be used, even if the voltage limiter is affected by PVT (process, voltage, and temperature) variations. The voltage limiter can have a fixed maximum voltage. [0003] figure 1 Is a traditional threshold voltage (V t ) Tracking voltage generator 1. V t The tracking voltage generator 1 has an operational amplifier 11. The positive input terminal of the operational amplifier 11 is connected to a reference voltage source V ref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCH02M1/08G05F1/563
Inventor 褚炜路刘斌
Owner NAN YA TECH