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Digitally controlled analog modulation circuit

An analog modulation and digital control technology, applied in circuits, electrical components, laser parts, etc., can solve the problems of inability to obtain analog modulation signal output, common terminal glitch interference, etc., to achieve the effect of eliminating glitch interference and reasonable design

Active Publication Date: 2015-11-18
杭州东城科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing analog switch devices in the prior art are usually provided with a very short internal time delay t. During this time, all ports of the analog switch are in the disconnected state. State, when the signal is switched, there will be burr interference on the common end of the analog switch, resulting in the problem that the pure analog modulation signal output cannot be obtained. Provide a method that can overcome the glitch interference on the common end of the analog switch and obtain pure analog Analog modulation circuit for digital control of modulated signal output

Method used

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  • Digitally controlled analog modulation circuit
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  • Digitally controlled analog modulation circuit

Examples

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Embodiment 1

[0021] A digitally controlled analog modulation circuit (see attached figure 1 ), including working power supply 1, bias power supply 2, modulation signal source 3, SPDT analog switch ASW1, SPDT analog switch ASW2 and laser constant current drive circuit 5, normally closed contacts of SPDT analog switch ASW1 and The normally open contacts of the SPDT analog switch ASW2 are electrically connected to the output end of the working power supply, the normally closed contacts of the SPDT analog switch ASW2 and the normally open contacts of the SPDT analog switch ASW1 are connected to the bias power supply The output ends are electrically connected, the common end of the single-pole double-throw analog switch ASW1 and the common end of the single-pole double-throw analog switch ASW2 are electrically connected to the input end of the laser constant current drive circuit 5, and the input end of the delay dual output circuit 4 is connected to the modulation signal The output end of the ...

Embodiment 2

[0024] This embodiment is basically the same as Embodiment 1, and the difference is that the delay double output circuit 4 in this embodiment is made up of an inverter, two AND gates and a NAND gate (see the appended figure 2 ), the input terminals of the AND gate and the NAND gate in this embodiment are all short-circuited and connected in series to form an inverting logic circuit, the input end of the inverting logic circuit is electrically connected with the output end of the inverter, and the output of the inverting logic circuit terminal is electrically connected to the control terminal of the SPDT analog switch ASW2, the input terminal of the inverter is electrically connected to the output terminal of the modulation signal source 3, and the output terminal of the inverter is also electrically connected to the control terminal of the SPDT analog switch ASW1 .

Embodiment 3

[0026] This embodiment is basically the same as Embodiment 1, and the difference is that the delay double output circuit 4 in this embodiment is composed of three NAND gates and an inverter (see the attached image 3 ), the input ends of the NAND gates in this embodiment are all short-circuited and connected in series to form an inverting logic circuit, the input end of the inverting logic circuit is electrically connected to the output end of the inverter, and the output end of the inverting logic circuit is connected to the The control end of the double-throw analog switch ASW2 is electrically connected, the input end of the inverter is electrically connected to the output end of the modulation signal source 3 , and the output end of the inverter is also electrically connected to the control end of the SPDT analog switch ASW1.

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Abstract

The invention relates to a modulation circuit, in particular to a digital controlled analog modulation circuit. The digital controlled analog modulation circuit aims to solve the problem of existing burr interference in the prior art, and is provided with the technical schemes that a working power supply, an offset power supply, a modulation signal source, a single-pole double throw analog switch ASW1, a single-pole double throw analog switch ASW2 and a laser device drive the circuit through constant current, the digital controlled analog modulation circuit further comprises a delay double-output circuit, an input end of the delay double-output circuit is electrically connected with an output end of the modulation signal source, a direct output end of the delay double-output circuit is electrically connected with a control end of the single-pole double throw analog switch ASW1, a delay output end of the delay double-output circuit is electrically connected with the control end of the single-pole double throw analog switch ASW2, an output electrical level of the direct output end of the delay double-output circuit equals to a reversed output electrical level of the modulation signal source, and the output electrical level of the delay output end of the delay double-output circuit is the same as that of the modulation signal source. The digital controlled analog modulation circuit has a reasonable design, and therefore the burr interference is eliminated.

Description

technical field [0001] The invention relates to a modulation circuit, in particular to a digitally controlled analog modulation circuit. Background technique [0002] The semiconductor laser is a current control device, and the luminous power is controlled by the forward current flowing through the laser. In order to obtain a stable laser power output, a constant current source circuit is usually used to drive the laser; in order to realize the analog output signal of optical power Digital modulation requires a digitally controlled analog modulation circuit. Typically, an analog modulation circuit uses a single-pole double-throw analog switch to quickly switch between two analog signals. However, in order to avoid short-circuiting the two signals during the switching process, there is usually a very short inherent delay t when manufacturing analog switching devices. During this time, all ports of the analog switch are in the disconnected state. In the disconnected state of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S5/042H03K5/01
Inventor 郑烈锋
Owner 杭州东城科技有限公司