BJT Characterization Laboratory Dr. Lynn Fuller
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1 ROCHESTER INSTITUTE OF TECHNOLOGY MICROELECTRONIC ENGINEERING BJT Characterization Laboratory Dr. Lynn Fuller 82 Lomb Memorial Drive Rochester, NY Tel (585) Fax (585) Dr. Fuller s Webpage: MicroE Webpage: Lab_BJT_Intro.ppt Page 1
2 OUTLINE 2N3904 BE Junction BC Junction IC-VCE Family of Curves Beta at low, medium, high currents SPICE Models Temperature Effects Page 2
3 2N3904 Label 2N3904 Flat Page 3
4 TEST EQUIPMENT HP4145 Semiconductor Paramater Analyzer Switch Matrix IEEE 488 Computer ICS (metrics) Osprey (video capture) Microsoft Office Ultracision Semi-Automatic Wafer Prober Test Fixture and Manual Probe Station Page 4
5 TEST STATION Light Source Switch Matrix PC Interface CCD Camera Microscope HP4145 tester Semi-Auto Probe Station Page 5
6 OPERATION OF HP4145 AND SWITCH MATRIX Turn on the HP4145, Switch Matrix, and PC Select ICS icon on the desktop (close and message window) Click on GPIB icon on the top of the screen select NI-32Thunk Click on Instrument icon and select HP4145 Click on device icon and select PN Diode or BJT Click on SMU1 then click on terminal (n-side of diode) set SMU1 to zero volts ground Click on SMU2 then click on terminal (p-side of diode) set SMU2 to sweep from -10 to 10 Volts, measure I and V Click on done Click on measure button Wait for data to graph then add cursors, lines, titles, source conditions Page 6
7 2N3904 DATA SHEET Note: see page of this document for more information on BJT SPICE parameters Page 7
8 THEORETICAL BE JUNCTION, BC JUNCTION, CE I I I V V V Base I + V - Emitter Base V + - I Collector + V - I Collector Emitter Page 8
9 BE AND BC DIODE CHARACTERISTICS Identify BE junction, measure ISE and VBE. Identify BC junction and measure IS. Identify Base, Emitter, Collector leads and label on sketch. 2N3904 Page 9
10 BETA MEASURED FROM FAMILY OF CURVES Beta = ~90mA and Vce=5 Beta = ~0.02mA and Vce=5 Early Voltage is measured to be 116 for IC ~ 15 ma Beta = ~40mA and Vce=5 Beta = ~15mA and Vce=5 Beta = ~5mA and Vce=5 Page 10
11 BETA VS IC 2N BETA ma 0.1ma Ic 1ma 10ma 100ma Measured SPICE SIMULATED Page 11
12 SPICE SIMULATED SPICE Simulatin of Beta vs Ic SPICE Model BETA Rochester Institute 100uA of Technology 1mA 10mA 100mA Ic Page 12
13 From the datasheet above BJT Characterization Laboratory 2N3904 SPICE MODEL Why does the SPICE model have Bf of 416 when the maximum Bf=300 Answer: It is a model parameter and when combined with other model parameters give correct results. See next page. Page 13
14 BJT SPICE PARAMETERS EFFECT ON BETA When BF=419 is used by itself it gives incorrect results BETA 200 QRITNPN NPN BF 416 Ic Adding IKF to the model helps reduce BF at high IC Adding IS, ISE and NE makes the model give correct results for all IC BETA BETA Ic Ic QRITNPN NPN BF 416 IKF QRITNPN NPN BF 416 IKF IS E-15 ISE E-15 NE Page 14
15 IC=VCD FAMILY OF CURVES IC SPICE MODEL QRITNPN NPN IS E-15 BF 416 IKF ISE E-15 NE RB 10 RC 1 VA 109 SPICE SIMULATION Vce Page 15
16 2N3904 FORWARD ACTIVE What is Beta? What is VA? Page 16
17 TEMPERATURE EFFECT ON FAMILY OF CURVES Page 17
18 2N3904 INVERSE MODE What is Beta? Page 18
19 2N3904 VBE STEPS What is gm? Page 19
20 PNP FORWARD ACTIVE Page 20
21 REFERENCES 1. MOSFET Modeling with SPICE, Daniel Foty, 1997, Prentice Hall, ISBN Operation and Modeling of the MOS Transistor, 2nd Edition, Yannis Tsividis, 1999, McGraw-Hill, ISBN UTMOST III Modeling Manual-Vol.1. Ch. 5. From Silvaco International. 4. ATHENA USERS Manual, From Silvaco International. 5. ATLAS USERS Manual, From Silvaco International. 6. Device Electronics for Integrated Circuits, Richard Muller and Theodore Kamins, with Mansun Chan, 3 rd Edition, John Wiley, 2003, ISBN ICCAP Manual, Hewlet Packard 8. PSpice Users Guide. Page 21
22 LAB WORK Obtain I-V plot for BE junction Obtain I-V plot for BC junction Obtain I-V plot for C-E Obtain Ic-Vce family of curves for 2n3904 (for different Ib s) Extract VA Early Voltage Extract Beta at 5 different IC values (0.1mA to 100mA) Obtain Ic-Vce family of curves at elevated temperature Obtain Ic-Vce family of curves for inverse operation Extract Beta Inverse Obtain Ic-Vce curves for different Vbe Repeat some or all of above for 2n3906 Page 22
23 HOMEWORK BJT INTRO Use SPICE to obtain the following: 1. Ic-Vce family of curves for 2N Extract VA Early Voltage 3. Extract Beta at 5 different IC values (0.1mA to 100mA) 4. Obtain Ic-Vce family of curves at elevated temperature 5. Obtain Ic-Vce family of curves for inverse operation 6. Extract Beta Inverse 7. Obtain Ic-Vce curves for different Vbe Page 23
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