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Electronic system with APC

An automatic power control and electronic system technology, applied in the direction of control/regulation system, regulation of electrical variables, instruments, etc., can solve problems such as APC circuit mismatch

Inactive Publication Date: 2008-05-07
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the influence of manufacturing process factors, the APC circuit will have the problem of mismatching

Method used

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  • Electronic system with APC
  • Electronic system with APC
  • Electronic system with APC

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Embodiment Construction

[0029] In order to make the above-mentioned and other purposes, features, and advantages of the present invention more clearly understood, the preferred embodiments are specifically listed below, together with the accompanying drawings, and are described in detail as follows:

[0030] FIG. 1 shows a schematic diagram of an electronic system for driving a laser diode in a normal mode. As shown, the electronic system 100 has a reference signal source 102 , an APC unit 104 , a laser diode driver 106 , a power detector 108 and a variable gain amplifier (VGA) 110 . In this embodiment, the reference signal source 102 generates a reference voltage Vref. The APC unit 104 receives the reference voltage Vref and the voltage Vmdi, and generates an output signal Sout. The laser diode driver 106 drives the laser diode 120 according to the output signal Sout. The power detector 108 detects the power of the light emitted by the laser diode 120 and generates a detection signal Sd. The vari...

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Abstract

The present invention relates to an electronic system with automatic power control, which comprises an automatic power control (APC) unit, an adjustment unit, and a calibration unit. The automatic power control (APC) unit receives a first input signal and a second input signal and generates an output signal. An adjustment unit coupled to the first input terminal of the APC unit generates a voltage offset according to an adjustment signal. The calibration unit provides the adjustment signal with a series of values. The calibration unit monitors the output signal until the output signal changes states.

Description

technical field [0001] The present invention relates to an electronic system, in particular to an electronic system for compensating the mismatch problem of an automatic power control (APC) circuit, in particular to an electronic system with automatic power control system. Background technique [0002] Fig. 8 is a characteristic curve diagram of a laser diode. As shown in the figure, when the input current received by the laser diode is less than a threshold current I th , the laser diode is used as a light-emitting diode (Light-EmittingDiode; LED). Therefore, the light intensity emitted by it is very weak. When the input current received by the laser diode is greater than the threshold current I th When , the light emitted by the laser diode will increase sharply as the input current increases. [0003] The threshold current I of the laser diode th will increase with increasing temperature. Therefore, it is necessary to use an Automatic Power Control (APC) circuit to...

Claims

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Application Information

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IPC IPC(8): G05F1/66
Inventor 赵国豪黄柏茜
Owner MEDIATEK INC
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