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Operating point such that a reasonably large and undistorted output voltage swing can be achieved and the quiescent point does not change significantly when one considers the normal production spread of device characteristics. (a) Common-source Amplifier One method of biasing a common-source amplifier is to use the self-bias circuit of Fig. 9. The resistor R 0 connects the gate to the common rail and serves mainly to isolate the input signal from the common rail. No voltage is dropped across R 0 because the gate current is essentially zero.

14 shows this parameter in decibels against the logarithm of frequency where hre is the low-frequency value of current gain. IT is shown as the point when the curve crosses the 0 dB axis. Also shown is the frequency fa, where the frequency up to this point is referred to as the bandwidth. 14 Current gain vs. frequency 24 fT log f value. Since fT ~ hrefa, then another interpretation of IT is as the gain-bandwidth product where we are considering the short-circuit current gain. 8 Calculation of Output Impedance The Thevenin representation of a circuit, as shown in Fig.

The channel induced is a function of the positive gate-to-source voltage. If a positive charge is placed on the gate then a negative charge consisting of electrons must appear in the p-type silicon, producing an inversion layer which forms a conductGate Drain Source (a) 53 Jorain Gate _j ~ Substrate Source (b) Cs (c) ing channel between drain and source. The size of this channel is a function of the gate charge. In a p-channel device, p-regions are diffused into ann-type silicon substrate. The characteristics and the definition of the terms 'depletion and enhancement modes' are given in the text.

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