A 2 MHz 3-port analog isolation and fanout module

Beadle, E R

Title: A 2 MHz 3-port analog isolation and fanout module

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Abstract

In many accelerator based data acquisition systems, signal isolation is a necessary feature so ground loops are avoided. Here, a 3-port isolated circuit providing 1:3 fanout, buffering and amplification over a multi-megahertz bandwidth is presented. The circuit accepts a single input and drives 3 independently isolated output channels, up to {plus_minus} 10 V into 50 ohms. The input and output isolation is supplied via a dual optocoupler, and the power isolation is achieved with DC/DC converters. In each channel, a voltage feedback amplifier is used in combination with the optocoupler to form a transimpedance configuration with the gain-bandwidth product (GBP) set by a pair of resistors. The feedback amplifier linearizes the optocoupler transfer characteristics using a servo technique and also controls the circuit drift, nonlinearity, and bandwidth. The circuit has demonstrated long-term drift of <{plus_minus} .1% of full scale, and resolution to better than 9 bits. The circuit provides frequency response to true DC with an analog bandwidth variable over a range of <100 kHz to >4 MHz, and a SNR of >55 db in a 1 MHz bandwidth with < 1% THD for a 10 V amplitude sinusoidal input. With few modifications, this design is capable of providing input/outputmore »« less

Authors:

Beadle, E R ^[1]

Brookhaven National Lab., Upton, NY (United States). AGS Dept.

Publication Date:: Mon May 01 00:00:00 EDT 1995

Research Org.:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Org.:: USDOE, Washington, DC (United States)

OSTI Identifier:: 52860

Report Number(s):: BNL-61115; CONF-950512-8
ON: DE95010348; TRN: 95:011878

DOE Contract Number:: AC02-76CH00016

Resource Type:: Conference

Resource Relation:: Conference: 16. Institute of Electrical and Electronic Engineers (IEEE) particle accelerator conference, Dallas, TX (United States), 1-5 May 1995; Other Information: PBD: [1995]

Country of Publication:: United States

Language:: English

Subject:: 43 PARTICLE ACCELERATORS; ACCELERATORS; DATA ACQUISITION SYSTEMS; DESIGN; DATA TRANSMISSION SYSTEMS; ANALOG SYSTEMS; PERFORMANCE; ELECTRONIC CIRCUITS

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                    Beadle, E R. A 2 MHz 3-port analog isolation and fanout module.  United States: N. p., 1995. 
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                    Beadle, E R. A 2 MHz 3-port analog isolation and fanout module.  United States.

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                    Beadle, E R. 1995.  
        "A 2 MHz 3-port analog isolation and fanout module".  United States.

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@article{osti_52860,

  title        = {A 2 MHz 3-port analog isolation and fanout module},

  author       = {Beadle, E R},

  abstractNote = {In many accelerator based data acquisition systems, signal isolation is a necessary feature so ground loops are avoided. Here, a 3-port isolated circuit providing 1:3 fanout, buffering and amplification over a multi-megahertz bandwidth is presented. The circuit accepts a single input and drives 3 independently isolated output channels, up to {plus_minus} 10 V into 50 ohms. The input and output isolation is supplied via a dual optocoupler, and the power isolation is achieved with DC/DC converters. In each channel, a voltage feedback amplifier is used in combination with the optocoupler to form a transimpedance configuration with the gain-bandwidth product (GBP) set by a pair of resistors. The feedback amplifier linearizes the optocoupler transfer characteristics using a servo technique and also controls the circuit drift, nonlinearity, and bandwidth. The circuit has demonstrated long-term drift of <{plus_minus} .1% of full scale, and resolution to better than 9 bits. The circuit provides frequency response to true DC with an analog bandwidth variable over a range of <100 kHz to >4 MHz, and a SNR of >55 db in a 1 MHz bandwidth with < 1% THD for a 10 V amplitude sinusoidal input. With few modifications, this design is capable of providing input/output gain and bandwidth in the range of 10--50 MHz.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/52860},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Mon May 01 00:00:00 EDT 1995},

  month        = {Mon May 01 00:00:00 EDT 1995}

}

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