Frequency synthesizers are an important part of modern electronic systems and are used in communications, radar, navigation, electronic countermeasures and test equipment. The main performance indicators of the frequency synthesizer include the following aspects.
(1) Output frequency range
The frequency range refers to the range of variation between the lowest frequency of the frequency synthesizer output and the highest frequency of the output, including the meaning of the center frequency and bandwidth.
(2) Frequency stability
The frequency stability refers to the value of the frequency synthesizer output frequency deviating from the calibration value within a specified time interval, and is divided into three kinds of stability degrees: long-term, short-term, and instantaneous.
(3) Frequency interval
The frequency interval is the minimum interval between two output frequencies, also called the frequency resolution. Frequency synthesizers for different purposes have different requirements for frequency spacing, from as small as a few hertz to as large as megahertz.
(4) Frequency conversion time
The frequency conversion time is the time at which the output frequency is converted from one frequency to another.
(5) Spectrum purity
The spectral purity is measured by spurious components and phase noise. The spurs are also called spurious signals. They are divided into harmonic components and non-harmonic components, which are mainly generated by nonlinear distortion in the frequency synthesis process. Phase noise is the measurement of the output signal.
(6) Modulation performance
Modulation performance refers to whether the output of the frequency synthesizer has functions such as amplitude modulation (AM), frequency modulation (FM), and phase modulation (PM).
With the continuous development of electronic technology, the requirements for the performance of frequency synthesizers are getting higher and higher. Since the 1980s, countries have been developing and developing their own DDS products. Nowadays, the most popular DDS products are Analog Devices, which mainly include AD7008, AD9830-9835, AD9850-9854 and other dozens of chips, forming 0~120MHz. A wide range of output frequency ranges. In addition, Qualcomm also has Q2334, Q2368 and other products. The clock frequency of these DDS chips ranges from 30MHz to 125MHz. The chip has general functions and integrated D/A converters and quadrature modulators. With the development of digital signal processing devices, DDS can be implemented in a software-based manner on programmable devices such as FPGAs and DSPs.
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