50301. A low-pass filter has a cutoff frequency of 1.23 kHz. Determine the bandwidth of the filter.
50302. Refer to this figure. Increasing the values of the filter section resistors in this circuit will cause the fc to
50303. One important application of a state-variable ________ filter with a summing amplifier is to minimize the 60 Hz "hum" in audio systems.
50304. Refer to the given figure. This is a ________ filter, and it has a cutoff frequency of ________.
50305. Refer to the given figure. RA = 2.2 k and RB = 1.2 k. This filter is probably a
50306. Refer to this figure. This filter has a roll-off rate of
50307. Identify the frequency response curve for a band-reject filter.
50308. A third-order filter will have a roll-off rate of
50309. A ________ filter passes all frequencies within a band between a lower and an upper critical frequency and rejects all others outside this band.
50310. A band-pass filter can be created by cascading a high-pass filter and a low-pass filter.
50311. The bandwidth of a band-pass filter is the sum of the two cutoff frequencies.
50312. A Sallen-Key filter is a second-order filter.
50313. Filters with Bessel characteristics are used for filtering pulse waveforms.
50314. The bandwidth of a practical high-pass filter is infinite.
50315. In filters, a single RC network is called a pole.
50316. A band-pass filter passes all frequencies within a band between a lower and an upper cutoff frequency.
50317. An active filter uses capacitors and inductors in the feedback network.
50318. A second-order filter has a roll-off of –20 dB/decade.
50319. Butterworth filters have the characteristic of a very flat response in the passband and a roll-off of –20 dB/decade.
50320. A ________ filter rejects all frequencies within a specified band and passes all those outside this band.
50321. Identify the frequency response curve for a band-pass filter.
50322. Filters with the ________ characteristic are useful when a rapid roll-off is required because it provides a roll-off rate greater than –20/dB/decade/pole.
50323. A ________ filter significantly attenuates all frequencies below fc and passes all frequencies above fc.
50324.
The gain of the multiple-feedback band-pass filter above is equal to which of the following? Assume C = C1 = C2.
50325. Each RC circuit causes the gain to drop at a rate of ________ dB/decade.
50326. The phase shift through the input of an RC circuit approaches ________° as the frequency approaches zero.
50327. A certain amplifier has a bandwidth of 22.5 kHz with a lower cutoff frequency of 600 Hz. What is the value of fcu?
50328. Internal transistor junction capacitances affect the high-frequency response of amplifiers by
50329. What is the method that can be used to determine the values of fcl and fcu of an amplifier?
50330. An amplifier has an input signal voltage of 0.054 mV. The output voltage is 12.5 V. The voltage gain in dB is
50331. The lower critical frequency is also known as the
50332. Refer to this figure. The capacitor C3 affects
50333. An RC network has a roll-off of 20 dB per decade. What is the total attenuation between the output voltage in the midrange of the passband as compared to the output voltage at a frequency of 10 times fc?
50334. It is often convenient in amplifiers to assign a certain value of gain as the ________ dB reference.
50335. For low-frequency response, all RC circuits in an amplifier may not have the same critical frequency. Which RC response will determine the critical frequency of the amplifier?
50336. A ten-times change in frequency is called a(n)
50337. An amplifier has an output voltage of 7.6 V p-p at the midpoint of the frequency range. What is the output at fc?
50338. The frequency response of an amplifier can be determined using the step response method, and measuring the output rise/fall times between
50339. Refer to this figure. The capacitor Cbe affects
50340. Refer to this figure. You measure an output voltage at the lower cutoff frequency of 3.42 V p-p. The output voltage at the upper cutoff frequency will be
50341. Refer to this figure. The upper cutoff frequency of this amplifier is 22 kHz. The output at that frequency is 6.71 V p-p. What is the output voltage at 220 kHz?
50342. Refer to this figure. The capacitor C1 affects
50343. In a multistage amplifier, the overall frequency response is determined by the
50344. What term means that the midrange voltage gain is assigned a value of 1 (or 0 dB)?
50345. An RC network has values of R = 1.2 k and C = 0.22 F. Find fc.
50346. Halving the power corresponds to a ________ dB ________.
50347. Refer to this figure. If RL decreases in value, the output voltage will
50348. A two-times change in frequency is called a(n)
50349. Refer to this figure. You are attempting to determine the lower cutoff frequency of this amplifier in the lab. As you change the input frequency and measure the output signal, you must remember to
50350. A decade of frequency change is a change by a factor of 10.