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• W2314142381 abstract "Traditional implementations of common system building blocks must eventually give way to new techniques and materials as the state of the art progresses. Devices and solutions, undreamed of a few years previously, continually become available. These new developments must be integrated into deliverable systems to maintain competitiveness in tightening markets. Automatic level control (ALC) of received signals is an important system function which finds many applications in wideband ground terminals. Strategic placement of ALC loops within the ground terminal optimizes system performance by controlling signal to noise ratios for high dynamic range input signals. In addition, power normalization also facilitates downstream processing such as demodulator carrier and clock recovery loops along with data detection. In an effort to continuously improve performance of every block of the wideband receive ground terminal, while reducing size and cost of each function, effort was targeted to new ways of implementing the ALC. Traditional implementation was based on stand alone components, interconnected with semirigid cables. This approach has been successfully taken for designs from L-Bandup to K-Band. Targeting new business pursuits at K-Band allowed for development of a MIC based ALC circuit. This new MIC ALC has been successfully designed, simulated, fabricated, assembled, and tested as a stand alone function. Front End Functionality The primary functions of a typical front end are: • Automatic level control (ALC): A wide variance of signal input power, commonly 20 dB or more, is normalized to the order of 1 dB, prior to being sent to subsequent circuitry. • Passband filtering: Typically a tightly defined bandpass filter with good amplitude and phase ripple specifications. • Gain slope equalization. • RF test point for sampling of the input signal before downconversion or demodulation. The traditional implementation of a front end for ground station applications is a metal bracket with stand alone amplifiers, couplers, and attenuators connected by semi-rigid cabling. This has been a very successful approach from L-Band up to K-Band. A simplified block diagram is shown in figure 1. The power detector provides a DC voltage proportional to the input signal power which is compared to an adjustable threshold value. This information is used to control a variable attenuator and pull the signal power in to the desired constant value." @default.
• W2314142381 created "2016-06-24" @default.
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• W2314142381 date "1996-02-25" @default.
• W2314142381 modified "2023-09-23" @default.
• W2314142381 title "Wideband (more than 3 GHz) MIC leveling loop reduces size and cost" @default.
• W2314142381 doi "https://doi.org/10.2514/6.1996-1122" @default.
• W2314142381 hasPublicationYear "1996" @default.
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