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RF Mixers

RF mixers are an essential part of radio communications systems, responsible for converting signals from one frequency to another. The AD831AP-REEL7 is a state of the art, low cost analog RF mixer from Analog Devices, Inc. This RF mixer is designed with a wide range of uses in mind, from communications receivers and transmitters to low noise amplifiers for industrial applications.

Application Field

The AD831AP-REEL7 is especially suitable for communications applications where low cost and small size are essential. It can be used in both transmitters and receivers for two-way radio, cellular base station, Wi-Fi and Bluetooth applications. It is suitable for use in medium-to-high power transmitters (up to 25 watts) for HF, VHF, UHF, and microwave applications. It is also well suited for use in microwave receivers where a high IIP3 (third-order intercept point) is needed.

The AD831AP-REEL7 is a good choice for low-noise amplifier (LNA) applications requiring wide dynamic range. It features low noise figure, high selectivity, and excellent linearity over a wide input range, making it ideal for use in LNAs for direct conversion receivers, radio astronomy receivers, and sensitive wireless data systems.

Working Principle

The AD831AP-REEL7 is a diode-ring mixer. It works by mixing two signals of different frequencies together by switching them between two ports. The resulting signal contains components at both the sum and differences of the two frequencies, allowing it to be used for frequency translation. The mixer also provides isolation between the two ports, allowing signals to be passed from one to the other without interference.

The mixer consists of a diode ring, four diodes connected in a ring configuration, a pair of LO (Local Oscillator) drive ports, and an RF (Radio Frequency) port. The LO port is connected to the LO source, which provides the signal to be mixed. This LO signal is then switched between two LO ports, which creates a signal with components at both the sum and difference of the two frequencies. The RF signal is then combined with the LO signal, resulting in a signal with components at both the sum and differences of the two frequencies.

The two signals are then combined to produce the output signal which can be used for frequency translation. The mixer also provides isolation between the two ports, thereby preventing interference between the two. This allows signals to be passed from one port to the other with minimal interference.

The AD831AP-REEL7 is a low cost, high performance solution for RF mixing applications. It offers excellent linearity and high selectivity, making it ideal for use in communications applications where low cost and small size are essential. It is well suited for use in medium-to-high power transmitters, as well as low-noise amplifier applications requiring wide dynamic range.

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