I am seeking to use this BFU520A transistor:
https://www.nxp.com/docs/en/data-sheet/BFU520A.pdf
or one like it to create a 40 MHz transimpedance amplifier of topology described by Phil Hobbs in Figure 9, page 4, of this article:
https://electrooptical.net/static/oldsite/www/frontends/frontends.pdf
I consider the BFU520A because of its very high Ft which means there would still be a lot of gain to do the bootstrapping at 40 MHz.
I seek to optimize the resistor values for the resistors in Figure 9. The data for that transistor does not go down to 40 MHz and below which is where I need it. To optimize my concern is how to determine what Beta, and Base Spreading Resistance, to use from 0 to 40 MHz, as a function of collector current, from the data available. Any suggestions are appreciated.
NXP provides models of BFU520A. You can use them to simulate the circuit or extract required parameters for your job.
SPICE model:
https://www.nxp.com/downloads/en/spice-model/BFU5XX_family_SPICE_GP_v2.zip
MEXTRAM model for Keysight ADS:
https://www.nxp.com/downloads/en/design-support/Installation_manual_for_NXP_BFU5XX_family_ADS_design...
https://www.nxp.com/downloads/en/design-support/BFU5XX_family_ADS_design_kit_v2.zip
Have a great day,
Pavel
TIC
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