MAX9985ETX+T

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RF mixers are active components that are used to combine two different frequency signals into a single signal of a different frequency. The MAX9985ETX+T is an RF mixer produced by Maxim Integrated, which offers high linearity and low noise performance in both receive and transmit applications. This article will discuss the application field and working principle of the MAX9985ETX+T.

The MAX9985ETX+T is an ultra-low-noise, high linearity RF mixer that is designed for use in radio frequency (RF) and microwave applications. It is suitable for use in a wide variety of applications, such as mobile base stations, radio transceivers, instrumentation systems, and satellite communications. The mixer features a low distortion, broadband design, high linearity, low noise figure, and is optimized for excellent noise performance. It can operate from -40°C to +85°C, and is available in both 8-pin MSOP and 8-pin VFQFN packages.

The MAX9985ETX+T is a RF mixer based on a diode double-balanced Gilbert cell architecture. It has an excellent conversion gain with very low distortion, making it ideal for high linearity applications. The Gilbert cell architecture also allows for high-output isolation, which reduces interference between the RF and IF paths. The mixer operates from -5V to +7V, making it suitable for low power applications. The device also features an integrated bias network, which allows for precise control of the bias voltage.

The working principle of the MAX9985ETX+T is based on the Gilbert Cell mixer, which consists of a single active element and four passive elements. The active element is a low noise differential amplifier, which is used to amplify the signal before it is mixed with the local oscillator signal. The passive elements are two pairs of identical capacitors, which are connected to the amplifier to form an oscillator circuit. The output of the amplifier is then mixed with the local oscillator signal, which produces the desired output signal at the IF frequency. The mixer also features a high-linearity input stage, which allows for high signal levels to be maintained without distortion.

In conclusion, the MAX9985ETX+T is a highly linear and low noise RF mixer that is suitable for a wide range of applications. It is based on a diode double-balanced Gilbert cell architecture and features an integrated bias network and a high-linearity input stage. The mixer provides excellent conversion gain with low distortion, making it ideal for high linearity applications. Additionally, it operates from -5V to +7V, making it suitable for low power applications.

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