The circuit in Problem 4.2) amplifier an input ac voltage signal which has an ou

Question

The circuit in Problem 4.2) amplifier an input ac voltage signal which has an output resistance of R_ = 10 k Ohm. The load of the amplifier R_L = 20 k Ohm With the same power supply and DC biasing current of 0.4 mA provided, the circuit can be redrawn as shown below, with R_ = R_/R_ and R_ obtained in Problem 42. The MOSFET also has other specs as follows C_ = 20 pF. C_ = 4 pF The coupling capacitors C_G = C_D = 20 mu F and bypass capacitor C_s = 2.0 mu F are used to assure the DC biasing Conditions. Use the previous results from Problem 4.2) and the newly given parameters do the following calculate the mid-band of gain Determine the EXACT bandwidth of the circuit in Hz. Use the time-constant method in low frequency calculation, and Miller's theorem in high frequency respectively If a signal of 10 Hz is needed to be amplified with a gain close to the mid-band gain. comment on the approach to tune the frequency if a signal with frequency of 300 kHz should be blocked from the amplifier, comment on the implementation approach.

Explanation / Answer

For calculating exact bandwidth

The Miller theorem refers to the process of creating equivalent circuits. It asserts that a floating impedance element, supplied by two voltage sources connected in series, may be split into two grounded elements with corresponding impedances.

i1(s) = v1(s) Z1(s) + v1(s) v2(s) Zfb(s) .

i1(s) = v1(s) Z 0 1 (s) .

and by using this formula we can find answer

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