MAX2207EBS+T

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RF Detectors

MAX2207EBS+T is an RF Detector that can be used in various RF applications. It is a low-power, four-quadrant detector that is simple to employ due to its wide dynamic range, low noise and high linearity.

Applications

MAX2207EBS+T offers the flexibility to address different applications. It is used in high-linearity, multi-tone detection solutions in various cellular base station transmitters, cellular modems, and Wi-Fi transceivers. It can be employed to detect wanted signals up to +20dBm in level and unwanted third-order intermodulation (IM3) products at -60dBm. It is also suitable for use in wider bandwidth applications such as 5G massive MIMO transceivers , where it can be configured on the receive chain to identify unwanted signals in densely populated wireless environments.

MAX2207EBS+T is also well-suited for more conventional low-complexity applications such as frequency-hopping radios, quad-band cellular phones, and Wi-Fi transceivers. It exhibits no drain current in Power-down mode, making it the ideal solution for battery-powered applications.

Working Principle

At the heart of MAX2207EBS+T lies a multi-tone detector. This detector is based on a four-quadrant multiplier which takes two signals as its inputs: an input signal and a local oscillator. The output is then a function of the power of the input signal, the power of the local oscillator, and the amplitude of the input signal. The product term of the input signal and the local oscillator is referred to as the Envelope Detector (ED) term, which is detected at the output.

The signal that is present at the output of the four-quadrant multiplier is the sum of the ED term and the DC term. The DC term is the average output that corresponds to the average of the DC levels of the input signal and local oscillator. The desirable signal in this case is the ED term, while the DC term is eliminated by the addition of a third path, referred to as a DC cancellation path. This path basically cancels out the DC term by subtracting the DC term at the output with respect to the reference node, which is the local oscillator.

The output signal finally passes through a Reconfigurable Low pass Filter (RLPF) and a voltage controlled amplifier (VCA) before being presented to the ADCs. The RLPF eliminates unwanted elements of the output signal such as the high frequency harmonics. The VCA controls the output voltage of the signal in order to reduce the possibility of activating the overrange of the ADC. The overrange of the ADC should not be activated under any circumstances; hence, it is important for this to be controlled to prevent any errors in conversion.

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