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Extra info for Cisco - Introduction to VPNs and Tunneling Technology 305
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If the performance requirements are such that they can be fulfilled by using only an input or output network, the computed gain is exact. Although in most applications both input and output matching circuits are used, we want to illustrate the single matching case also because it will help us later to better understand the uses of constant-gain circles [7]. 6 Amplifier with single matching network at the output. In this case the exact transducer gain is a function of s21, s22, and the load connected to the two-port, ΓL.
The easy answer is easy—virtually all RF/MW transistors are potentially unstable at some frequencies, and sellers do not want to advertise potential problems to those not wanting oscillation. They may warn you about grounding and coupling concerns, but do not expect their datasheets to list the stability-factor, which is analytically defined in the next section. 11. 10). “No match” shows the basic 50-Ω gain, and “2Match” stands for adding In2 and Out2 simultaneously to both sides. RF circuit stability considerations 21 dB gain vs.
We cannot avoid having some minimum ground inductance, but by grounding the two stages separately, the signal current of the second stage is not fed back directly to the first stage. 5Ω inductive reactance, which is enough to create harmful positive feedback at that frequency. 17 compares the gains and input reflection coefficients of the two different grounding methods, showing the kind of problems that may be caused by improper grounding. 2 Stability analysis with arbitrary source and load terminations Next, let us examine if there are other conditions that may lead to unwanted RF oscillation.