Scatter parameters (S-parameters) of transistors are necessary for HF circuit simulation. Using computational tools (like Microwave Office, or its freeware analog RFsim99, which used to be here, but is now to find elsewhere) one can predict the gain of a circuit, its stability, its input and output impedances. Further, one can design the input and output matching and filtering networks in order to obtain maximum gain in the desired frequency range and to reduce the reflection losses. An alternative way to define transistor data for simulation would be to use a set of parameters for Gummel-Poon model and its derivatives (SPICE parameter set).
A Paper on dimensioning and simulation of microwave power amplifiers using S-parameters (in German) of transistors was presented in Dorsten in 2008
Unfortunately, S-parameters of most common-use transistors with Ft below 1000 MHz are not specified in their datasheets. These parameters may scatter depending on the manufacturer, and even on the production date. Nevertheless, collecting S-parameters is worth doing, because even slightly deviating from the reality parameters provide a good basis for assessment of transistor properties and provide a starting point for circuit design. It is important to remember that S-parameters depend on the working point and are specified for small signals, much below -1dB compression point. The last may be important if you design a power amplifier. For measurement of S-parameters, the best way is to use a network analyser. However, this expensive equipment is seldom present at ham's shack. A cost-effective (but somewhat complicated to use) alternative was designed and will be published, the reference you shall find here soon.
This page contains files with scatter parameters of transistors which I evaluated so far and that which were contributed by others. If you can contribute to the list, your contribution is welcome. However, your data will appear at this page only if you provide the complete information including, besides of the measured S-parameters in .s2p format, following:
1) working point(s) of the transistor during the measurement (i. e.
collector current and collector-emitter voltage)
2) manufacturer or origin of the transistor, preferentially including
the production date, any codes found on the package and distributor
3) measurement method used (type of the network analyser and its mode,
literature reference, or description of the measurement circuit,
whatever applicable)
4) your ham call or name for eventual queries of hams who use
your data
Parameters of obsolete, old-type, discontinued, or foreign transistors are as welcome, as that of contemporary transistors. The only limitation is that their S-parameters should not be readily available for wide public at present time, for example, from a published datasheet. Wide-spread common types are preferred.
Unfortunately, neither I am going to check the contributed
measurements, nor I can guarantee that the information here is correct,
so please
use it at your own risk. As for my own measurements, I perform them
just
as well and as many of them, as I believe reasonable... Finalliy, it is
not more than my hobby.
| Part No. | Manufacturer | Data | Method | Contributor |
| BF199 | CDIL Philips |
10V 7mA 10V 7mA |
Microstrip couplers, attenuators, meas. line,
microvoltmeter SMV-8 Calculated from SPICE model of Philips |
DF4AE / UT5UAK DF4AE / UT5UAK |
| BF414 | Analog Systems | to appear once | ||
| BF506 | Telefunken | to appear once | ||
| BF959 | Motorola | 10V 20mA | Microstrip attenuators, meas. line, summator, microvoltmeter SMV-8 | DF4AE / UT5UAK |
| BFG591 |
Philips |
various |
- |
data of the manufacturer |
| KT606a КТ606А |
USSR (1W, 70 cm, 28V) |
20V 100mA | Microstrip attenuators, meas. line, summator, microvoltmeter SMV-8 | DF4AE / UT5UAK |
| KT610b КТ610Б |
USSR (1W, 70 cm, 12V) |
10V 150mA | Microstrip attenuators, meas. line, summator, microvoltmeter SMV-8 | DF4AE / UT5UAK |
| KT907a КТ907А |
USSR (5W, 70 cm, 28V) |
20V 500mA |
Microstrip attenuators, meas. line, summator, microvoltmeter SMV-8 | DF4AE / UT5UAK |
| 2T909b 2Т909Б |
USSR (10W, 70 cm, 28V) |
20V 500mA |
Microstrip attenuators, meas. line, summator, microvoltmeter SMV-8 | DF4AE / UT5UAK |
| KT911a КТ911А |
USSR (1,5W, 23 cm, 28V) |
22V 50mA |
Microstrip attenuators, meas. line, FET
mixer, microvoltmeter SMV-8 |
DF4AE / UT5UAK |
| KT911b КТ911Б |
USSR (2W, 70 cm, 28V) |
22V 54mA |
Microstrip attenuators, meas. line, FET
mixer, microvoltmeter SMV-8 |
DF4AE / UT5UAK |
| KT913a КТ913А |
USSR | 20V 250mA | to appear soon | DF4AE / UT5UAK |
| KT919b КТ919Б |
USSR (1,6W, 23 cm, 28V) |
23V 19mA 23V 150mA |
Microstrip attenuators, meas. line, FET mixer, microvoltmeter SMV-8 | DF4AE / UT5UAK |
| 2N3553 | US (military?) | to appear soon | ||
| 2SC1162 | 15V 500mA |
to appear once |
Last update: 21.01.2008