Self-adaptation threshold value circuit of comparator

An adaptive threshold and comparator technology, applied in the field of threshold circuits, can solve the problems of reducing receiver noise immunity, increasing comparator false trigger output, etc.

Inactive Publication Date: 2014-03-05
SUZHOU BATELAB MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At minimum signal levels, such adjustments may increase the false trigger o

Method used

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  • Self-adaptation threshold value circuit of comparator
  • Self-adaptation threshold value circuit of comparator
  • Self-adaptation threshold value circuit of comparator

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Embodiment Construction

[0036] Figure 1A A simplified schematic 100 of a conventional DC servo loop amplifier and comparator 190 is shown. exist Figure 1AIn , preamplifier 160 has its negative input coupled to node 104 , its positive input coupled to node 109 , and its output coupled to node 106 . Photodiode 102 is coupled between ground and node 104 and provides an input to preamplifier 160 in the form of a current I that varies according to the amount of light impinging on the photodiode. In the absence of illumination, photodiode 102 sinks current from node 104 . As the light intensity increases, the current I also increases.

[0037] Feedback resistor 150 sets the gain of preamplifier 160 and is coupled between node 104 and node 106 . Diode 152 and the base-emitter circuit of transistor 108 (the collector of transistor 108 is coupled to the positive supply terminal (V+)) are respectively coupled to resistor 150 in an inverse relationship to limit the voltage across resistor 150 . Diode 152...

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Abstract

Provided is a self-adaptation threshold value circuit of a comparator. The threshold voltage of the circuit is suitable for the input signal property. In one instance, a steady state threshold voltage stored in a peak detection capacitor is generated through the base-emitter voltage ratio of two emitter followers. When an input signal is changed, the threshold voltage is changed along with the change of the input signal. A current source controlled by the voltage detects the amplitude of the input signal, and the amplitude of the threshold voltage is adjusted by the way of controlling the voltage drop on a resistor. A feedback signal indicates that the state of the comparator output end which is coupled to the self-adaptation threshold value circuit is used for providing lags. In another instance, the threshold voltage is determined by the voltage drop on a first resistor, a current controlled by the voltage detects the amplitude of the input signal, and the amplitude of the threshold voltage is adjusted by the way of controlling the voltage drop on a second resistor.

Description

Technical field: [0001] The present invention relates to threshold circuits for comparators. More particularly, the present invention relates to a novel adaptive threshold circuit for generating a threshold voltage to a comparator which compares an input signal with the threshold voltage so that the generated threshold voltage adapts to the characteristics of the input signal. Even more particularly, the present invention relates to adaptive threshold circuits capable of adapting the threshold voltage at the output of a photodiode preamplifier. [0002] In digital communication systems, photodiode receivers are used to detect light pulses transmitted by light emitting diodes (LEDs). Photodiodes typically provide an input current to a preamplifier that converts the input current to a voltage and adds modest gain. A comparator reconstructs the received pulse by comparing the output voltage of the preamplifier with a threshold voltage. Such photodiode receivers typically opera...

Claims

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Application Information

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IPC IPC(8): H03K5/22
Inventor 不公告发明人
Owner SUZHOU BATELAB MICROELECTRONICS
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