Determination of the show-stopper values of feedback elements¶
Exercise¶
The figure below shows a concept of a negative feedback voltage amplifier with resistive feedback. The amplifier is driven from a voltage source with a source resistance \(R_s=600\Omega\). The voltage gain of this amplifier should be 20dB, while its noise figure should be better than 2dB.
Give the maximum value of the feedback resistors.
Fig. 11 Concept of a negative feedback voltage amplifier.¶
Hint¶
The maximum value of the feedback resistors is determined by their noise contribution. This contribution should not result in a noise figure larger than 2 dB.