By Cornel Turcu (Ed.)
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A. & Martin, K. (1997) Analog Integrated Circuit Design, John Wiley & Sons, ISBN 0471144487. Sedra, A. S. & Smith, K. C. , Oxford University Press, ISBN 0195323033. Lee, T. H. (2004). The Design of CMOS Radio-Frequency Integrated Circuits – 2nd Edition, Cambridge University Press, ISBN 0521835399. Coleman, C. (20040 An Introduction to Radio Frequency Engineering, Cambridge University Press, ISBN 0521834813. Gilmore, R. & Besser, L. (2003) Practical RF Circuit Design for Modern Wireless Systems – Vol.
3 Miller effect in cascode topology The Miller effect implies that the effective capacitance is increased by negative voltage gain between input and output. However, since the input impedance of the cascode device M2 is capacitive, the voltage gain is high in low frequency and low in high frequency, which implies the effective Miller capacitance will be high in low frequency and low in high frequency. Therefore, it explains that the Miller effect creates not only a single capacitor, but also an inductor in parallel with the Miller capacitor.
This means that the asymptotic decrease of gain is the same as in the previous circuit, –20 dB/dec. Thus the inductor allows modifying the gain locally, in the vicinity of the frequency ω1, and the designer should use this possibility to his/her advantage. Consider the amplitude of the frequency response for this circuit, given as Av ( j ) gm R L / R 2 1 2 1 2LC RC 2 (5) To facilitate subsequent derivations, it is introduced a factor m, defined as the ratio of the RC and τ = L/R time constants, m RC R2 R2 2 L / R L /C (6) Here L / C is the wave resistance of the load.