Environmental Engineering Reference
In-Depth Information
6.6.2 Frequency Compensation of the Shunt-Series Amplifier
The schematic shown in Fig. 6.34 is the high-frequency small-signal
circuit of the series-shunt amplifier already depicted in Fig. 6.12. Note that
load capacitance includes the output capacitance, of transistor T2.
For the shunt-series amplifier, the circuit path for evaluating the return
ratio comprises the gain stage (provided by transistor T1) closed in unitary
loop by transistor T2 (which is in common Z configuration and works as a
voltage buffer) and the feedback resistors. It is worth noting that the load
impedance is outside the loop, and, hence, does not play any role in the
compensation process.
