Linked Life Data

18699629

Source:http://linkedlifedata.com/resource/pubmed/id/18699629

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
7
pubmed:dateCreated
2008-8-13
pubmed:abstractText
A simple, low-cost conductance bridge circuit, which provides high-resolution measurements of dI/dV and d 2I/dV2 for a voltage-biased load, is presented. A resolution in dI/dV for a 90-Omega tunnel junction of several parts in 10(5) has been measured using a 35-microV-rms modulation level and a 1-s postdetection time constant (Bn=0.25 Hz). The output impedance of the voltage source and the error in the conductance measurement are discussed. The output impedance of the circuit with an AD119 operational amplifier is 0.02 Omega. A detailed discussion of Johnson-Nyquist, tunnel junction, and amplifier noise is presented.
pubmed:language
eng
pubmed:journal
pubmed:status
PubMed-not-MEDLINE
pubmed:month
Jul
pubmed:issn
0034-6748
pubmed:author
pubmed:issnType
Print
pubmed:volume
50
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
903-8
pubmed:year
1979
pubmed:articleTitle
High-resolution dc-voltage-biased ac conductance bridge for tunnel junction measurements.
pubmed:affiliation
Physics Dept., University of Virginia, Charlottesville, Virginia 22901, USA.
pubmed:publicationType
Journal Article