Technical Article_SDI Over Fiber Extenders

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Pulse Frequency Modulation

Pulse Frequency Modulation (PFM) is a conversion method commonly used in DC-DC converters to enhance efficiency under light-load conditions. In product datasheets provided by TI, PFM is also referred to as "power-saving" mode. When operating in power-saving mode, the converter switches to PFM at low-load current levels, while reverting to Pulse Width Modulation (PWM) mode during heavier load conditions. This dual-mode operation allows the converter to maintain exceptionally high efficiency across a wide range of output currents.

2019/02

Simulated Transmission System

Analog transmission involves sending information through a transmission medium in the form of an analog signal.

2019/02

Digital Transmission System

A digital transmission system refers to a method where the transmission capacity of the transmitter is controlled by signals fed into it via a propagation path from the receiver. The receiver generates control signals that optimize the system’s transmission capacity based on monitored information such as transmission quality or the receive C/N ratio, and then outputs these control signals to both the transmitter and the decision-making circuitry.

2019/02

Analog Signal Digitization

An analog signal refers to information represented by continuously varying physical quantities—such as time, amplitude, frequency, or phase. Analog signals are ubiquitous in nature, appearing in everyday phenomena like daily temperature fluctuations, the speed of a car while driving, and the voltage magnitude at a specific node in an electrical circuit.

2019/02

Fiber Optic Transmission Loss

After light signals are transmitted through optical fibers, their optical power decreases due to factors such as absorption and scattering. Fiber optic loss is a critical performance metric for fiber transmission, directly influencing the maximum transmission distance of fiber-optic communication systems.

2017/10

Four Methods for Impedance Matching

When there is impedance discontinuity along the transmission path, reflections occur. The purpose of impedance matching is to ensure continuous impedance throughout the transmission line by using terminating components, thereby eliminating reflections generated in the transmission chain.

2017/05

The working principle of phase-locked loops and their significance in signal processing

A phase-locked loop (PLL) refers to a circuit designed to lock onto a specific phase. Anyone familiar with the principles of automatic control knows that this is a classic feedback control system, where an external reference signal is used to precisely regulate both the frequency and phase of an internal oscillating signal. This ensures that the output signal frequency automatically tracks the input signal frequency—making it particularly useful in closed-loop tracking applications.

2017/03

What is 3G-SDI? How does it differ from HD-SDI?

First, we need to understand what SDI is. Known as the Serial Digital Interface in English, it’s actually a type of interface—specifically, a digital serial interface.

2017/03