3-F-046: Filters and IF Amplifiers
3-46F1:
What is the primary purpose of the final IF amplifier stage in a receiver?
Gain.
Dynamic response.
Noise figure performance.
Bypass undesired signals.
3-46F2:
What factors should be considered when selecting an intermediate frequency?
Image rejection and selectivity.
Cross-modulation distortion and interference.
Interference to other services.
Noise figure and distortion.
3-46F3:
What is the primary purpose of the first IF amplifier stage in a receiver?
Selectivity.
Noise figure performance.
Tune out cross-modulation distortion.
Dynamic response.
3-46F4:
What parameter must be selected when designing an audio filter using an op-amp?
Bandpass characteristics.
Desired current gain.
Temperature coefficient.
Output-offset overshoot.
3-46F5:
What are the distinguishing features of a Chebyshev filter?
It allows ripple in the passband.
It has a maximally flat response over its passband.
It only requires inductors.
A filter whose product of the series- and shunt-element impedances is a constant for all frequencies.
3-46F6:
When would it be more desirable to use an m-derived filter over a constant-k filter?
When you need more attenuation at a certain frequency that is too close to the cut-off frequency for a constant-k filter.
When the response must be maximally flat at one frequency.
When the number of components must be minimized.
When high power levels must be filtered.
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