专业英语翻译长汉语,要准确,不能像在线翻译那样,那样太不合格。
最晚今天晚上9点半答复,因为明天就要用。
pass filter but have little effect on Vo due to the reject characteristics of
the high-pass filter. A frequency f2 may pass through the high-pass fil
ter unmolested but be prohibited from reaching the high-pass filter by
the low-pass characteristics. A frequency fo near the center of the pass
band will pass through both filters with very little degeneration.
The network of Example 23.7 will generate the characteristics of
Fig. 23.29. However, for a circuit such as the one shown in Fig. 23.30,
there is a loading between stages at each frequency that will affect the
level of Vo. Through proper design, the level of Vo may be very near the
level of Vi in the pass-band, but it will never equal it exactly. In addition,
as the critical frequencies of each filter get closer and closer together
to increase the quality factor of the response curve, the peak values
within the pass-band will continue to drop. For cases where Vomax≠Vimax the bandwidth is defined at 0.707 of the resulting Vomax.
EXAMPLE 23.7 For the pass-band filter of Fig. 23.30:
a. Determine the critical frequencies for the low- and high-pass filters.
b. Using only the critical frequencies, sketch the response characteristics.
c. Determine the actual value of Vo at the high-pass critical frequency
calculated in part (a), and compare it to the level that will define the
upper frequency for the pass-band.
Solutions:
a. High-pass filter:
Low-pass filter:
b. In the mid-region of the pass-band at about 500 kHz, an analysis of
the network will reveal that Vo ≌0.9Vi as shown in Fig. 23.31. The
bandwidth is therefore defined at a level of 0.707(0.9Vi) = 0.636Vi
as also shown in Fig. 23.31.
c. At f = 994.72 kHz,
Since the bandwidth is defined at 0.636Vi the upper cutoff frequency
will be higher than 994.72 kHz as shown in Fig. 23.31.
————————————————————————————
The pass-band response can also be obtained using the series and
parallel resonant circuits discussed in Chapter 20. In each case, however,
Vo will not be equal to Vi in the pass-band, but a frequency range
in which Vo will be equal to or greater than 0.707Vmax can be defined.
For the series resonant circuit of Fig. 23.33, XL = XC at resonance,
and
As a first approximation that is acceptable for most practical applications,
it can be assumed that the resonant frequency bisects the bandwidth.
——————————————————————————————
EXAMPLE 23.8
a. Determine the frequency response for the voltage Vo for the series
circuit of Fig. 23.35.
b. Plot the normalized response Av = Vo /Vi.
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