RF Transistors Forum Discussions

Hello,

I'm not very experienced with RF frequencies. Need to design a single-transistor buffer. Input signal will be from an oscillator (NOT a 50 Ohm device - impedance not precisely known but assumed high), frequency will vary from a few MHz to ~1-2 GHz. Precise oscillator amplitude currently unknown but likely ~40mV to ~1V. Buffer output will route to a 50 Ohm measurement device. VCC likely small, either ~1.5V or ~3V. I was thinking of using the BFR340F. If anyone with experience can comment on this choice, or perhaps suggest something better, I would appreciate it. I am assuming that if I lay out a standard emitter-follower type circuit it will be a reasonable choice (input signal routes to base via capacitor to AC couple; voltage divider placeholder(s) to set DC voltage at base; optional resistor from VCC to collector; optional capacitor to ground from collector; resistor from emitter to ground, output through a capacitor from emitter).

Hi All,

I am trying to figure out the nonlinear model for the BAR90-02ELS diode. The H-Spice works fine for forward bias but not for reverse bias. Anyone has the parameters to make a Caverly model that works for the reverse bias as well. I am trying to simulate it in AWR and these are the parameters I would need. 

Thank you

Is (Reverse Saturation Current)
IKnee (Knee parameter for the current dependent tau)
N (Ideality factor)
RLIM (minimum series resistance)
REPI (Epi leakage resistance)
CJ (Reverse Capacitance)
CPKG (Package Capacitance)
Tau (Storage time)
W (I region width in micrometers)
B (ratio of electron to hole mobility)
LBOND (bond wire inductance)