SA616BS,115 RF/IF and RFID

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RF mixers are one of the essential components that are used in radio reception and broadcast systems. They are used to convert a radio frequency (RF) signal into a lower frequency (IF) signal which can be processed. Found in virtually all radio receivers, RF mixers are also used in modulators, frequency synthesizers, and even cell phone base stations. The SA616BS,115 is a good example of an RF mixer and this article will cover its application fields and working principle.

Application Fields

The SA616BS,115 is a general purpose down conversion mixer which can be used for applications such as HF receivers, transceivers as well as for a wide range of gain and level controlled applications. It combines high sensitivity, low noise figure, high input impedance, and wide bandwidth from 0.5 to 1000MHz for optimum performance in both CW and SSB applications. With its low distortion figures, it is also suitable for applications that require excellent linearity such as harmonics reduction, mixing, frequency conversion, and mixers for digital modulation.

Working Principle

The SA616BS,115 employs a non-linear, mutual-conductance active element to convert the RF signal to an IF signal. This active element is also referred to as a mixer. When the RF signal reaches the mixer, it is converted into an IF signal by a process called heterodyning, whereby the RF signal and the local oscillator (LO) interact and produce a new signal with a difference frequency, equal to the sum of the two input frequencies. This is generally represented as f=|fRF-fLO|. In addition to producing the IF signal, the mixer also provides image rejection and unwanted mixing products which are generally referred to as spurs and harmonics.

When two frequencies are combined, the even and odd order mixing products are produced. The difference frequency between the RF and LO is the wanted or desired signal, and the sum frequency between the RF and LO is the image signal which is generally much weaker than the desired signal. The unwanted or undesirable spurs and harmonics are the multiples of the difference and image frequencies. In order to minimize nonlinear components or unwanted mixing products, most mixers include additional filter circuitry to reject out of band frequencies.

Conclusion

In conclusion, the SA616BS,115 is an RF mixer which is used in a wide range of applications including radio reception and broadcast systems. Its unique combination of high performance characteristics make it a great choice for both CW and SSB applications. Its non-linear, mutual conductance active element is used to convert the RF signal to an IF signal, and it also produces the image and unwanted mixing products. Additional filter circuitry is included to reject out of band frequencies, resulting in a high performance mixer.

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