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SPICE models of the JFET and MOSFET (introduced in 4) provide the terminal characteristic of the devices; thus, an ampli er can be properly biased and a time-varying input signal directly applied to the completely modeled ampli er circuit. Such a simulation is the analytical equivalent of laboratory ampli er circuit operation. Any desired signal can be measured directly in the time domain to form signal ratios that yield current and voltage gains. Any signal distortion that may result from device nonlinearity is readily apparent from inspection of the signal time plots.
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Example 7.4. For the JFET ampli er of Fig. 7-5, VDD 15 V; R1 100 k; R2 600 k; RD 5 k; RS 2:5 k; RL 3 k; and CC1 CC2 CS 100 F. The n-channel JFET has the parameter values of Example 4-1. If vS 0:25 sin 2 104 t V and ri is negligible, use SPICE methods to determine the voltage gain of the ampli er circuit.
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SMALL-SIGNAL MIDFREQUENCY FET AND TRIODE AMPLIFIERS
[CHAP. 7
+ VDD
RD R2 3 1 ii ri CC 2
6 iL
4 R1
LL _
Fig. 7-5
The following netlist code describes the circuit:
Ex7_4.CIR vs 1 0 SIN(0V 0.25V 10kHz) VDD 5 0 DC 15V CC1 1 2 100uf CC2 3 6 100uF CS 4 0 100uF R1 2 0 100kohm R2 5 2 600kohm RD 5 3 5kohm RS 4 0 2.5kohm RL 6 0 3kohm J 3 2 4 NJFET .MODEL NJFET NJF(Vto=-4V Beta=0.005ApVsq + Rd=1ohm Rs=1ohm CGS=2pF CGD=2pF) .TRAN 1us 0.1ms .PROBE .END
Execute hEx7_4.CIRi and use the Probe and FFT features of PSpice to plot the input voltage vi and output voltage vL waveforms and their Fourier spectra as displayed by Fig. 7-6. The voltage gain is found as the ratio of the marked spectra fundamental components of Fig. 7-6. Av vL 0:748 2:99 vS 0:250
The negative sign indicates the 1808 phase di erence between vi and vL as noted by inspection of the instantaneous waveforms.
The capabilities of SPICE are also suited to FET ampli er analysis using the small-signal equivalent circuit of the types shown by Figs. 7-1 through 7-4. Use of the voltage-controlled voltage source (VCVS) and the voltage-controlled current source (VCCS) of Section 1.3 nds obvious application in the small-signal equivalent circuit analysis.
Example 7.5. Rework Example 7.1 using SPICE methods. vi 0:25 sin 2 104 t V. For purposes of computation, let
CHAP. 7]
SMALL-SIGNAL MIDFREQUENCY FET AND TRIODE AMPLIFIERS
Fig. 7-6
Fig. 7-7
The following netlist code describes the circuit:
Ex7_5.CIR vi 1 0 SIN(0V 0.25V 10kHz) RG 1 0 100kohm E 0 2 (1,0) 60 rds 2 3 30kohm RD 3 0 3kohm .TRAN 1us 0.1ms .PROBE .END
Execute hEx7_5.CIRi and use the Probe feature of PSpice to plot the instantaneous waveforms of vi and vo as shown in Fig. 7-7. The gain is found as the ratio of the marked peak values with the 1808 phase shift accounted for by the negative sign. Av vo 1:363 5:45 0:250 vi
GRAPHICAL AND EQUIVALENT CIRCUIT ANALYSIS OF TRIODE AMPLIFIERS
The application of a time-varying signal vS to the triode ampli er circuit of Fig. 4-14 results in a grid voltage with a time-varying component, vG VGQ vg It is usual practice to ensure that vG 0 by proper selection of the combination of bias and signal. Then iG 0, and the operating point must move along the dc load line from the Q point in accordance with the variation of vg , giving instantaneous values of vP and iP that simultaneously satisfy (4.8) and (4.11).
Example 7.6. The triode ampli er of Fig. 4-14 has VGG ; VPP ; RG ; and RL , as given in Example 4.7. If the plate characteristics of the triode are given by Fig. 7-8 and vS 2 sin !t V, graphically nd vP and iP .
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