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Logarithmic scale analog to digital converter for wide dynamic range avalanche photodiode current companding

一种转换器电路、电流的技术，应用在监视使用雪崩光电二极管产生的电流领域

Active Publication Date: 2020-05-19
ANALOG DEVICES INT UNLTD CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current generated by the APD may have a dynamic range of 10,000 to 1
Such a large dynamic range can make it challenging to design circuits to track the APD current

Method used

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  • Logarithmic scale analog to digital converter for wide dynamic range avalanche photodiode current companding
  • Logarithmic scale analog to digital converter for wide dynamic range avalanche photodiode current companding
  • Logarithmic scale analog to digital converter for wide dynamic range avalanche photodiode current companding

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Embodiment Construction

[0014] As previously explained in this paper, APDs can be used to convert optical signals into electrical signals, but the dynamic range of the APD current presents challenges in circuit design for monitoring APD performance. One way to address the large dynamic range is to convert the APD's current into a logarithmic-scale voltage signal. This logarithmic current-to-voltage (I2V) conversion compresses or expands the wide dynamic range of the current for quantization. For APD current monitoring, logarithmic I2V conversion is more attractive than linear I2V conversion. For example, with logarithmic I2V, an 8-bit quantizer can achieve a relative accuracy of 3.663% over a four-decade input range, while for linear I2V conversion, an 18-bit quantizer is required to have the same accuracy.

[0015] Due to its exponential I-V characteristics, NPN type bipolar transistors ("NPN transistors") can be used as I2V converters. For example, a transconductance amplifier based on the logari...

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Abstract

An electronic circuit comprises an analog-to-digital converter (ADC) circuit. The ADC circuit includes a pre-amplifying transistor and a quantizer circuit. The pre-amplifying transistor includes a base, an emitter and a collector. The pre-amplifying transistor is configured to receive an input voltage at the base that varies logarithmically; and produce an output voltage at the collector accordingto a comparison of a reference voltage and a difference between the input voltage and a voltage at the emitter. The quantizer circuit is operatively coupled to the pre-amplifying transistor and is configured to generate a digital value for the input voltage using the output voltage produced by the pre-amplifying transistor.

Description

[0001] Cross References to Related Applications [0002] This disclosure claims the benefit and benefit of U.S. Application No. 16 / 186,238, filed November 9, 2018, entitled "Logarithmic Scale Analog-to-Digital Converter for Wide Dynamic Range Avalanche Photodiode Current Companding" and Priority, the entire contents of which are hereby incorporated by reference. technical field [0003] This document relates to integrated circuits and in particular to monitoring currents generated using avalanche photodiodes (APDs). Background technique [0004] Avalanche photodiodes (APDs) are used to convert optical signals into electrical signals, for example for optical receivers. APD current can be used as an indication of the strength of the light signal. Therefore, real-time measurement of the APD current is required to monitor the performance of the APD. However, the dynamic range of the current produced by the APD may be 10,000 to 1. Such a large dynamic range can make it challe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/34
CPCH03M1/34G01J1/44G01J2001/4466H03M1/46H03M1/1235H03M1/124
Inventor 埃里克·斯蒂芬·扬伍球忠齐昕
Owner ANALOG DEVICES INT UNLTD CO
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