Diode Temperature Dependence

Diode Temperature - Temperature Dependence Start with diode I-V relation I I s e qVd nkT 1 I s eVd nVT Note Vd nVT ln I Is kT VT q I s T 3e Eg kT

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
© Robert York, 2006-2007 Back to TOC Temperature Dependence // 1 dd T qV nkT V nV ss II e I e    ln dT s I Vn V I For constant- current biasing: TCV 3 g T E VV V n TT T k T     I b V d Start with diode I-V relation: I V d T 1 T 2 / 3 g E kT s IT e Note: 5 19 bandgap enegy 1.13eV (Si) Boltzman constant 8.62 10 eV/ K 1.6 10 C g E k q  I b 3 g E k T  T kT V q 290K 10mA 1pA 1 d s T I I n TCV 2mV/ C    21 2mV VT T 
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
© Robert York, 2006-2007 Back to TOC Temperature Dependence 0 5 10 15 20 25 30 35 40 0.20 0.30 0.40 0.50 0.60 0.70 0.80 Diode Voltage V, Volts Current I, mA Model at T=290K Model at T=300K Model at T=310K Data at 300K Note: for discrete diodes the ideality factor is closer to n=2 Significantly increased temperature coefficient Ex: 1N4005 measured data 300K 10mA 5.5nA 1.82 d s T I I n TCV 5mV/ C  The change in voltage or current in diodes and transistors must be dealt with in the design of circuits Can be exploited too: a temperature sensor!
Background image of page 2
© Robert York, 2006-2007 Back to TOC Temperature Dependence I d V d T 1 T 2 V b   21 6mA I
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/17/2010 for the course ECE 2B taught by Professor York during the Winter '07 term at UCSB.

Page1 / 4

Diode Temperature - Temperature Dependence Start with diode I-V relation I I s e qVd nkT 1 I s eVd nVT Note Vd nVT ln I Is kT VT q I s T 3e Eg kT

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online