M1020-11-155.5200T

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The M1020-11-155.5200T is a clock generator optimized for Optical Ethernet standards such as IEEE802.3z and 802.3ae, specifically 10 Gigabit Ethernet. It is capable of frequency synthesizing a multiple of 155.52 MHz in order to generate four different output frequencies, one at 155.52 MHz and three at multiples of 105.888 MHz, which are necessary to support various Ethernet applications. It also benefits from a lower-power consumption and higher frequency resolution.

Broad market applications for the M1020-11-155.5200T exist in the telecom and industrial communications, high-speed networking, computing, military, test and measurement, and broadcast equipment.

Introduction

The M1020-11-155.5200T is an all digital PLL clock synthesizer, i.e. with all of its functions implemented within the digital domain in order to provide an precisely timed output frequency. It exhibits a high frequency resolution, low power consumption, high flexibility and robust and reliable performance when in operation. This means that the device is suitable for a wide range of high-demand communication applications. Based on the demand of the market, Microsemi has also released a high-performance version which further reduces the power consumption and improves the total harmonic distortion.

Working Principle

The M1020-11-155.5200T uses a VCO, Digital Phase-Locked Loop (DPLL), and programmable frequency synthesizer to generate the output frequency. A DPLL combines a voltage-controlled oscillator (VCO) and phase detector for frequency synthesis. Once the system is locked an output clock with carefully adjusted phase and frequency will be produced.

The VCO generates the waves at an adjustable frequency, and in the M1020-11-155.5200T, it is set by a digital programmable divider at 155.52 MHz. This frequency is then multiplied by a scalar of 1, 2 or 4 depending on the application to produce the desired output. This allows the user to have access to a wide range of frequencies with little loss of performance.

The DPLL controls the phase and frequency of each output by a digital programmable divider and proprietary control logic, which include a 1 gigahertz digital frequency divider, a 3.5 gigahertz frequency divider, and 2 gigahertz accumulator. The control logic uses the output from all of these components to regulate the output frequency.

The DPLL uses a feedback mechanism to ensure accurate output frequency control. It contains a phase detector, which compares the input frequency with the oscillating voltage from the VCO and produces an error signal which is filtered and fed back to regulate the VCO. Thus when the DPLL is locked, the VCO is matched with the input frequency, and the output will be accurately synthesized.

Benefits

The M1020-11-155.5200T is a reliable and cost effective solution which can generate frequencies which are compatible with the IEEE802.3z and 802.3ae Ethernet standards. Its high frequency resolution and flexibility makes it suitable for applications where frequency accuracy is important. It has a low power consumption, which allows it to operate over a long lifetime, and its robust performance makes it one of the preferred clock generators used in many optical networking applications.

Additionally, the included programmable frequency synthesizer allows users to generate multiple frequencies which can be used in different applications. There is also an optional higher-performance version which further reduces the power consumption and improves the total harmonic distortion.

Conclusion

The M1020-11-155.5200T is a reliable and versatile clock generator which is suitable for optical Ethernet standards such as IEEE802.3z and 802.3ae. Its robust performance and cost effective nature makes it an ideal choice for applications where frequency accuracy and consistency is important. With its low power consumption, the M1020-11-155.5200T has become the preferred clock generator for many optical networking applications.

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