Fig 4.2 The network of Fig. 4.] following removal of the dc supply and
insertion of the short-circuit equivalent for the capacitors
Fig 4.3 Circuit of Fig. 4.1 redrawn for small-signal ac analysis
In summary, the ac equivalent of a network is obtained b

are never exactly sinusoidal. However, the closer the value Eel is to exactly 1,
the more nearly sinusoidal is the waveform.
716 PHASESHIFT OSCHLATOR
An example of an oscillator circuit that follows the basic development of a
feedback circuit is the phase

CHAPTER 5 SMALL SIGNAL ANALYSIS OF FETS
5.1 INTRODUCTION
Field-effect transistor amplifiers provide an excellent voltage gain with the
added feature of a high input impedance. They are also considered low-power
consumption congurations with good frequency

CEI-
To determine fLE, the network seen by CE must be determined as shown in
Fig. 6.6. Once the level of Re is established, the cut-off frequency due to CE can
be determined. f
Fig. 6.6 Determining the effect of CE on the low-frequency response
fLE = l/ZT

Fig. 7.3 Voltage-Series feedback connection
VOLTAGE-SHUNT FEEDBACK
A more detailed voltage-shunt feedback connection is shown in Fig. 7.4. The
input impedance can be determined to be
Fig. 7.4 Voltage-Shunt feedback connection
Zif = Vi/Is = V1/ (Ii+lf) =

The resulting level of drain current ID is now controlled by Shockleys equation:
ID =IDss(1-VGs/Vp)2
Since VGS is a fixed quantity for this configuration, its magnitude and sign can
simply be substituted into Shockley s equation and the resulting level of