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Output level voltage regulation

A voltage and level technology, applied in the field of electrical interface circuits, can solve problems such as device damage and inability to interact

Inactive Publication Date: 2012-12-19
ATMEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the output level is not compatible with the input level, the unit may be damaged and not interoperable

Method used

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  • Output level voltage regulation
  • Output level voltage regulation
  • Output level voltage regulation

Examples

Experimental program
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Embodiment Construction

[0011] see figure 1 , the output pad 12 produces an output voltage that is applied to the output line 14 . A reference power supply such as tester 16 produces a stable and fixed reference voltage on line 18 . These voltages are compared by comparator 20, which is an analog error amplifier that generates an output by sensing errors above or below a reference threshold voltage. The resulting comparator output will be a logic high or low, depending on the polarity of the error.

[0012] see figure 2 , comparing the initial output voltage level 40 with the reference voltage level 60 . because figure 1 The value of the voltage 40 at the middle node 38 is initially lower than the reference voltage level, so the state of the comparator output remains at the low state 50 in this example.

[0013] back to figure 1 , the comparator 20 sends a signal to the state machine 22, which is a logic device. The logic device registers what it did in the previous cycle. If the error signa...

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PUM

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Abstract

A circuit adapting pin output levels to a reference level in which a digital comparator compares an output voltage from an output pin of a device to a reference voltage level. The comparator, relying on the polarity of the comparator output as well as the registered polarity of the comparator output on the previous clock cycle, signals a state machine, which sends a clocked signal to a sense circuit and voltage regulator. The sense circuit may modify a resistance in a switched resistor network, such that the output level is incrementally stepped at clocked intervals towards the reference voltage until the polarity of the error signal reverses. When the output voltage crosses the reference voltage threshold, the comparator flips states and continues to regulate output pin voltage to the reference voltage level.

Description

technical field [0001] The present invention relates to electrical interface circuits and, more particularly, to circuits for matching output voltages to desired voltages. Background technique [0002] Computer systems contain many electronic components that must interoperate. In order to minimize the cost of the various components, different components are made to operate at different voltages. If the output level is not compatible with the input level, the device may be damaged and not interoperable. [0003] In existing circuit designs, level shifter circuits will typically be used to interconnect devices, for example by interconnecting parts of a bus system. Each part will have a different supply voltage and a different logic level. In a typical example, each part will have a supply voltage, a pull-up resistor and device connected to the supply voltage, and a serial data bus line and a serial clock bus line connected to the device. An exemplary level shifter circuit ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/10
CPCG01R31/31703G05F3/24G01R31/31713
Inventor 加埃唐·布拉克马德亨利·博塔罗
Owner ATMEL CORP