By Ravender Goyal
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Extra info for High-Frequency Analog Integrated Circuit Design
This design uses the Darlington equivalences, which are subject to conditions of validity (Appendix 4). – Integration of the reactive part of impedance into the reactance of the last filter element. The load topology (series or parallel) imposes that of the last element of the filter and the physical feasibility criterion involves validity conditions for integration (Appendix 4). g n g n +1 ≥ QB where Q is the quality factor for load impedance whose expression depends on the topology. In Appendix 4, we show that the different validity conditions associated with the topology of the load and the reference impedance value R0 limit the choice to four possibilities: – Load impedance is a series circuit: Rnorm = RL gn+1 Q = – R0 < RL g n+1 : the g1 element is in series.
By overlapping the stability circles at transistor outputs in the same frequency band, we find that the impedances are located in areas of potential instability. It is therefore necessary to stabilize the transistor outside the operating band, especially at low frequencies. 23. Stability and polarization The most frequently used method is to introduce further power dissipation outside the operating band by inserting a resistor either in the polarization circuit, or in series with the grid or drain of the transistor.
It is therefore necessary to stabilize the transistor outside the operating band, especially at low frequencies. 23. Stability and polarization The most frequently used method is to introduce further power dissipation outside the operating band by inserting a resistor either in the polarization circuit, or in series with the grid or drain of the transistor. The effect of this resistance is adjusted in relation to the frequency using a decoupling capacitor for which the value is adjusted to obtain a good gain-stability compromise.