ADF4113BRU

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ADF4113BRU application field and working principle

ADF4113BRU is a wideband, low-cost, low-phase noise, wide tuning range frequency synthesizer designed for cellular infrastructure applications. It has been designed to generate precise signals from 1.2 GHz to 2.7 GHz. The device supports quickfrequency hoppingand two-way communication, making it ideal for powering transceivers and modem designs.

The frequency synthesizer supports multiple sleep modes, enabling prolonged battery life and further decreases overall system costs. The device offers separate VCO supplies with external buffer, enabling concurrent bi-directional communication over a single VCO. The frequency synthesizer contains integrated output mixer, loop filter, and reference detector.

The ADF4113BRU device is architected to provide the optimal balance between low power consumption and superior performance. The device includes a digital loop filter with programmable bandwidth, allowing it to be optimized for different applications. In addition, the programmable loop filter can also be used to reduce the loop delay through an internal loop filter design.

The ADF4113BRU provides an internal reference frequency of either 3.2 or 4.0MHz. The frequency synthesizer also supports divided frequencies from either a 3.2 or 4.0MHz internal reference frequency. It is optimized for applications where phase noise and spurious are critical, such as in cellular applications. The device supports multiple external reference frequencies, as well as a VCO resistor programmable.

Application Fields

• Cellular Infrastructure
• Bluetooth® Wireless
• GPS and Wi-Fi® Networks
• Telemetry
• Quadrature modulation

Working principle

The ADF4113BRU device is a frequency synthesizer that enables precise control of carrier frequencies in an efficient, low-power manner. The frequency synthesizer consists of a phase-locked loop (PLL), loop filter and dividers. The PLL is a feedback circuit that compares the input reference frequency to the output frequency from the loop filter, and adjusts the VCO until the two frequencies match.

The frequency synthesizer is designed to provide precise tuning ranges. The output frequency is determined by the external reference frequency and the VCO frequency. The VCO frequency is generated from the reference frequency by frequency multiplication in the PLL. The loop filter is used to control the spacing between output frequencies. The loop filter can be set to have a center frequency of the internal reference frequency, or it can be offset to allow wider frequency bands.

The dividers operate in the frequency synthesizer chain to divide the frequency of the internal reference or the VCO to achieve the desired frequency output. The dividers are typically implemented using voltage-controlled oscillators (VCOs). The dividers can also be used to achieve precise frequency hopping, with very low spurious and phase noise performance.

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