Power System Analysis and Design (MindTap Course List)
Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN: 9781305632134
Author: J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher: Cengage Learning
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Question
File Preview n 1: The Optimized Receiver (25 Points) A designer is building a receiver with a band select filter (Insertion Loss = 3 dB), followed by an LNA, and then a Mixer. • • • • System Constraint: The total cascaded Noise Figure (NFTOT) must be exactly 5.0 dB to meet sensitivity requirements. Mixer Specs: Conversion Gain (Gc) = 4 dB; Noise Figure (NFMIX) = 6 dB. LNA Specs: Noise Figure (NFLNA) = 1.5 dB. Physical Constraint: The LNA is connected to the mixer via a cable with a loss of 0.5 dB/meter. The components are separated by 2 meters. A) (15 Points) Calculate the minimum linear gain required for the LNA to satisfy the 5.0 dB system Noise Figure limit. You must incorporate the cable loss as an additional attenuating stage between the LNA and Mixer.
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Transcribed Image Text:File Preview n 1: The Optimized Receiver (25 Points) A designer is building a receiver with a band select filter (Insertion Loss = 3 dB), followed by an LNA, and then a Mixer. • • • • System Constraint: The total cascaded Noise Figure (NFTOT) must be exactly 5.0 dB to meet sensitivity requirements. Mixer Specs: Conversion Gain (Gc) = 4 dB; Noise Figure (NFMIX) = 6 dB. LNA Specs: Noise Figure (NFLNA) = 1.5 dB. Physical Constraint: The LNA is connected to the mixer via a cable with a loss of 0.5 dB/meter. The components are separated by 2 meters. A) (15 Points) Calculate the minimum linear gain required for the LNA to satisfy the 5.0 dB system Noise Figure limit. You must incorporate the cable loss as an additional attenuating stage between the LNA and Mixer.
B) (10 Points) The system uses low-side injection with an IF of 100 MHz and an LO of 900 MHz. If the desired RF signal is received at -55 dBm and the Mixer provides an Image Rejection Ratio (IRR) of 25 dB, what is the maximum allowable power (in dBm) of an image signal at the RF input if the image and desired signal must be equal in power at the IF output?
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Transcribed Image Text:B) (10 Points) The system uses low-side injection with an IF of 100 MHz and an LO of 900 MHz. If the desired RF signal is received at -55 dBm and the Mixer provides an Image Rejection Ratio (IRR) of 25 dB, what is the maximum allowable power (in dBm) of an image signal at the RF input if the image and desired signal must be equal in power at the IF output?
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