Sine and Cosine Waves of DDS Direct Digital Synthesizers

1. Function description This project realizes the DDS direct digital frequency synthesizer, utilizes the characteristic that the phase of sine wave increases linearly, produces sine wave and cosine wave. This project is mainly composed of 3 parts: phase accumulator, phase-amplitude conversion, digital-to-analog converter DAC (implemented outside FPGA). Among them, the upper 10 bits of the […]

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Analysis of Design Principle of Multi-waveform Signal Generator

In teaching experiments and teaching research, the signal generator is indispensable as an instrument to provide electrical signals for testing. At present, general-purpose signal generators can only output common waveform signals, which cannot meet some special needs. For example, in the teaching of electronic measurement, through the experiment of measuring the output characteristic curve of […]

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Definition of Phase Noise and Jitter Crystal Phase Noise Requirements for High Speed ​​Systems

Crystal oscillators are a large family. In addition to the simple package clock oscillator (SPXO), there are also voltage-controlled crystal oscillators (VCXOs), temperature-compensated crystal oscillators (TCXOs), oven-controlled crystal oscillators (OCXOs), and digitally compensated crystal oscillators. (MCXO or DTCXO), each with unique properties such as phase noise and jitter. What is phase noise and jitter? Simply […]

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How to choose LDO capacitance and noise in LDO and DC/DC

Electronic Enthusiasts Network reported (text / Li Ningyuan) The output voltage conditions of traditional linear regulators are very strict, and this is the birth of LDO-type voltage conversion chips. In LDO selection and design, it is often difficult. First we have to consider not only the type and range of the input voltage, such as […]

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Talking about the trade-off between SWaP and performance in SDR design

The radio frequency (RF) world changed completely with the advent of software-defined radio (SDR). These devices transform the dominant technological paradigm of the RF industry from fixed and bulky analog electronics to flexible and compact software-based signal processing, significantly increasing the range of commercial off-the-shelf (COTS) radio systems. As a result, SDRs now dominate the […]

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Testing and debugging have different problem analysis

Testing and debugging have different problems. In testing, the goal is to determine as quickly as possible, with a high but not absolute certainty, that the chip is working correctly. Chip design teams now generally recognize that doing so requires adding DFT (design-for-test) circuitry to the chip, and third-party tools and IP (intellectual property) companies […]

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An article to analyze the air conditioner amplifier and the car acceleration cut-off device

1. Air conditioner amplifier With the development of electronic technology, electronic components are highly integrated. The volume continues to shrink, and the functions continue to expand and become intelligent. In the process of development, the automotive air-conditioning controller has also realized from scratch, from simple to complex, from low-level to high-level, from single function to […]

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What is the amplification factor and gain of the circuit?

What is circuit amplification and what is gain? To clarify this issue, we must first start with the basic concepts. 1. Exponential and logarithmic relationship. The exponential function f(x)=ax means that there are x a’s to multiply. When there are 5 a’s to multiply, f(5)=a×a×a×a×a=a5, the (independent) variable is the exponent. And g(x)=xa, it is […]

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About the operation of a typical op amp circuit

Operational Amplifier Circuit Operational amplifiers are versatile and have become the amplifier of choice for many applications. The advantage of integration also allows op amps to be included in many application specific integrated circuits (ASICs) where, in combination with other circuit elements, chips can be designed to perform specific functions, for example, from dedicated tone […]

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