Agilent Technologies EasyEXPERT - Page 29

1 BJT
1.10 Ctc-Vc: Ctc-Vcb characteristics (A.01.20)
[Supported Analyzer]
B1500A
[Description]
Measures the Base-Collector capacitance (Ctc), and plots the Ctc-Vcb characteristics.
For a more accurate measurement, perform correction data measurement at the measurement frequency before
starting the capacitance measurement.
If the measurement frequency is not included in the list of default frequencies below, click the Advanced
Options... button and set the measurement frequency on the Frequency area of the Advanced Options for CMU
Calibration window.
Default frequencies:
1 k, 2 k, 5 k, 10 k, 20 k, 50 k, 100 k, 200 k, 500 k, 1 M, 1.2 M, 1.5 M, 2 M, 2.5 M, 2.7 M, 3 M, 3.2 M, 3.5 M,
3.7 M, 4 M, 4.2 M, 4.5 M, 5 MHz
[Device Under Test]
Bipolar transistor
Connect Base to the CMU Low, Collector to the CMU High, and the other terminals to the GNDU.
[Device Parameters]
Polarity: NPN (CMU forces the specified value) or PNP (CMU forces the negative specified value).
Le: Emitter length
We: Emitter width
Lb: Base length
Wb: Base width
Temp: Temperature
[Test Parameters]
IntegTime: Integration time
FREQ: Measurement frequency
OscLevel: Measurement signal level
Base: CMU connected between Base and Collector (CV sweep measurement)
VcbStart: DC bias start voltage
VcbStop: DC bias stop voltage
VcbStep: DC bias step voltage
[Extended Test Parameters]
HoldTime: Hold time
DelayTime: Delay time
[Measurement Parameters]
Parallel capacitance Cp
Conductance G
[User Function]
PI=3.141592653589
D=G/(2*PI*FREQ*Cp)
Rp=1/G
Cs=(1+D^2)*Cp
X=-1/(2*PI*FREQ*Cs)
Rs=D*abs(X)
Z=sqrt(Rs^2+X^2)
Agilent EasyEXPERT Application Library Reference, Edition 8
1-13