LMH6505: Variable Gain Amplifier

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The document provides an overview of the LMH6505 variable gain amplifier, including its key features, internal block diagram, and applications. It discusses the amplifier's low power operation, broad voltage controlled gain range, frequency response adjustment, and single supply configuration. Recommendations are provided for circuit board layout and component selection to optimize performance. Applications like automatic gain control are also described.

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LMH6505: Variable Gain Amplifier ,[object Object]

Introduction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Features ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Setting the Maximum Gain R G : determines the input voltage range R F : determines overall bandwidth

Single Supply Operation ,[object Object],[object Object],[object Object],[object Object]

Gain Accuracy & Gain Matching ,[object Object]

Recommendations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Additional Resource ,[object Object],[object Object],[object Object],[object Object],[object Object],Newark Farnell

A loop antenna is a radio antenna consisting of a loop or coil of wire, tubing, or other electrical conductor with its ends connected to a balanced transmission line (or possibly a balun). There are two distinct antenna designs: the small loop (or magnetic loop) with a size much smaller than a wavelength, and the much larger resonant loop antenna with a circumference close to the intended wavelength of operation. Small loops have low radiation resistance and thus poor efficiency and are mainly used as receiving antennas at low frequencies. To increase the magnetic field in the loop and thus the efficiency, the coil of wire is often wound around a ferrite rod magnetic core; this is called a ferrite loop antenna. The ferrite loop is the antenna used in many AM broadcast receivers, with the exception of external loops used with AV Amplifier-Receivers and car radios; the antenna is often contained inside the radio's case. These antennas are also used for radio direction finding. In amateur radio, loop antennas are often used for low profile operating where larger antennas would be inconvenient, unsightly. (c) WIkipedia

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The term amplifier refers to any device that increases the amplitude of a signal, usually measured in voltage or current. This versatile device is used in a variety of different electronic applications. Especially in audio technology, a wide range of amplifiers can be produced based on product specifications (i.e. power, voltage, current). Currently, there are many types of audio amplifiers available for consumers. Sound signal amplification is used for instruments, such as the guitar or the bass. They are also used commonly in home theater systems and with stereo speakers. The basic design behind all of these amplifiers is derived from the simplest concepts of circuit design. For our project, we set out to design an audio amplifier. The inputs of our circuit were stereo signals from a portable music player. Although we used a low-power speaker, we needed to achieve approximately three times gain over the entire circuit. In addition, the amplifier had to be produced at a low cost with available materials. Before building the actual amplifier, we realized that we had to design, simulate, and test the circuit. Each step was necessary to understand the concepts involved in amplification

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