Burst signal detection circuit without resetting

A technology for detecting circuits and burst signals, applied in electrical components, electronic switches, electromagnetic receivers, etc., can solve problems such as difficulty in adapting to 25GPON systems, low working speed, complex structure, etc., achieve small footprint, prevent false triggering, The effect of simple circuit structure

Pending Publication Date: 2021-10-08
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the reset circuit needs to be designed separately, which has the defects of complex structure, la

Method used

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  • Burst signal detection circuit without resetting

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Embodiment Construction

[0023] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0024] Such as figure 1 As shown, the present invention extracts the high-frequency component of the signal, loads it on the common mode level, and charges the capacitor through a three-input transconductance amplifier to realize the burst detection function. The circuit includes: three NPN bipolar transistors Q1~Q3, three MOS tubes M0~M2, eight resistors R0~R7, four capacitors C 1 ~C4, a current source I1; on the one hand, the base of transistor Q1 is connected to the input voltage Vin1n in parallel through resistor R5 and capacitor C2; On the other hand, it is connected to the drain of MOS transistor M1 and the gates of MOS transistors M1 and M2, and the emitter is connected to the emitters of transistors Q2 and Q3 on the one hand, and the drain of MOS transistor M0 on the other hand; On the one hand, the base is connected to the input volt...

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Abstract

The invention discloses a reset-free burst signal detection circuit, and the circuit is characterized in that a burst detection function is realized by charging a load capacitor through a three-input transconductance amplifier after a burst signal high-frequency component is loaded on a common-mode level of the burst signal high-frequency component. The direct-current offset of the signal can be eliminated by loading the high-frequency component of the signal to the common-mode level of the signal; for a three-input transconductance amplifier, the transconductance amplifier outputs current to charge a load capacitor in the presence of an emergent alternating current signal, so the voltage of an output node is increased, and an emergent detection signal is generated. The burst detection circuit has the advantages that reset signals are not needed, the structure is simple, the working speed is high, and power consumption is low; the number of components is reduced, the occupied chip area is smaller, the circuit integration degree is improved, the cost is reduced, and burst signal detection is easily achieved.

Description

technical field [0001] The invention relates to a partial circuit of an optical receiver in a system such as an optical fiber communication optical access network, in particular to a burst signal detection circuit without reset. Background technique [0002] Fiber optic networks are rapidly becoming the infrastructure underpinning the entire information network, playing a key role in delivering any service to any endpoint (home, business, and cell site). Systems such as Ethernet passive optical network EPON and Gigabit passive optical network GPON have matured, and large-scale construction has begun. In the PON system, the optical receiver needs to provide the function of burst signal detection, and generate an output signal when the burst signal arrives. The traditional burst signal detection circuit often needs to provide an additional reset signal, and with the assistance of the reset signal, a burst detection signal is generated to the subsequent circuit. Therefore, th...

Claims

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Application Information

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IPC IPC(8): H03K17/16H04B10/60
CPCH03K17/16H04B10/60
Inventor 陈莹梅肖嘉锴
Owner SOUTHEAST UNIV
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