Which of the following is not present in the conversion stages of super heterodyne receiver?(a) Local oscillator(b) Additional filter(c) Step attenuator(d) AmplifierI got this question during an interview.My doubt stems from RF and IF Processing Tradeoffs in chapter Technology Tradeoffs in Software Defined Radio of Cognitive Radio

Which of the following is not present in the conversion stages of supe

1.	Which of the following is not present in the conversion stages of super heterodyne receiver?(a) Local oscillator(b) Additional filter(c) Step attenuator(d) AmplifierI got this question during an interview.My doubt stems from RF and IF Processing Tradeoffs in chapter Technology Tradeoffs in Software Defined Radio of Cognitive Radio
Answer» The correct CHOICE is (c) Step ATTENUATOR The EXPLANATION is: Each conversion stage of super heterodyne receiver has one LO, additional filters and amplifiers. Step attenuator is present after the pre-selector filters. It confines the total power at the input of first conversion stage WITHIN its linear range.

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