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本文比较详细地阐述了高速锁相环频率合成器在目黑MSW-7125A型AM/FM全波段扫频仪的数字可变频标中的应用。该扫频仪的电原理图见第24页。扫频仪采用了数字式频率合成器形成频标之后,频标的稳定性好,误差小,且可随意改变,克服了过去采用LC或晶体滤波器所产生的频标的缺点,且该仪器具有存储标点的功能。所以,它
This article describes in more detail the application of high-speed PLL frequency synthesizer in digital black-and-white frequency conversion standard of Meguro MSW-7125A AM / FM full-band frequency sweeper. The electrical schematic of the scanner is shown on page 24. After the frequency sweeper adopts the digital frequency synthesizer to form the frequency standard, the stability of the frequency standard is good, the error is small, and can be changed arbitrarily, overcoming the shortcomings of using the frequency standard produced by the LC or the crystal filter in the past, and the instrument has a storage Punctuation function. So, it