transistor h prameters - Page 1
Forum section: electronics / beginners

author: yalect
author_rank: Regular Contributor
timestamp: January 05, 2021, 09:41:31 pm
content: Hello,I would like to ask you about transistor h prameters like hFEand others I thinkh11 orh21 can I find them andcan I mesure them by simple circuit?for example transistors :bc547,bc558,bc337thank you

author: ogden
author_rank: Super Contributor
timestamp: January 05, 2021, 10:01:10 pm
content: hFE can be measured using simple circuit. h11 and h21 not that much. Further reading: internet search.

author: MathWizard
author_rank: Super Contributor
timestamp: January 05, 2021, 10:35:02 pm
content: So far when I formally used H-Para's, without any capacitace in the models, I was dropping the dependant voltage source term on the input side, since it was so small. I'll be going over that stuff on much more detail soon, but when does that h12V2 term for BJTs start to matter any amount ?

author: yalect
author_rank: Regular Contributor
timestamp: January 25, 2021, 10:03:15 pm
content: Sorry, I didn't understand what do you mean by:when does that h12V2 term for BJTs start to matter any amount ?."h12V2."as you know we can define transistor likeresistor for input side or between the input and Emitterandsmall Current generator for outside or collector and some times or there is asmall resistorbetween the collector and Gnd .- those resistors (input resistor and output resistor), Can I measure their values with simple circuit let's say transistors :bc547, bc558, bc337if it's possible?- maybe a picture or video to palantion?.Thank you

author: Jwillis
author_rank: Super Contributor
timestamp: January 26, 2021, 06:45:21 pm
content: Hfe Hybrid parameter , forward current gain, common emitter A measure of the DC gain of a junction transistorhieinput impedance (Ω)hrereverse voltage ratio (dimensionless)hfeforward current transfer ratio (dimensionless)hoeoutput admittance (Siemen)h11 Input resistance Output Shorted Transistor configuration is as Common Emitter hie=Veb/IbCommon Base hib=Veb/IeCommon Collector hic=Vbc/Ibh12 Reverse voltage Gain Input open Transistor configuration is as Common Emitter hre=Vbe/VceCommon Base hrb=Veb/VcbCommon Collector hrc=Vbc/Vech21 Forward Current Gain Output Shorted Transistor configuration is as Common Emitter hfe=Ic/IbCommon Base hfb=Ic/IeCommon Collector hfc=Ie/Ibh22 Output Conductance Input Open Transistor configuration is as Common Emitter hoe=Ic/VceCommon Base hob=Ic/VcbCommon Collector hoc=Ie/VecEdit forgot some math and typo's

author: rfeecs
author_rank: Frequent Contributor
timestamp: January 27, 2021, 05:12:01 am
content: Realize that H parameters, like Z, Y, and S parameters are small signal two port parameters.You can measure H parameters with a network analyzer by measuring S-parameters and converting to H-parameters.You can measure low frequency DC H parameters with a semiconductor parameter analyzer or using some SMUs, by forcing current or voltage and measuring current or voltage. Since they are small signal parameters (small variation about an operating point), you would look at the slope of the variation at the operating point of interest.You could do a simple measurement in the same way with power supplies and meters.