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无线调频发射器 无线调频发射器的设计
amplitude values of the sine wave form, the MSB of the modulate phase word input is registered twice in modphase_msb1_ff and modphase_msb2_ff, compensating for the two cycle latency of the phaseadd and qwavesin_ff registers. The delayed MSB bit is used to invert the ROM table output when one. The altered ROM table output and the invert of the delayed modulated phase word MSB are finally registered in by the dac_ff register and then assigned to the DACOUT output port.
Sine ROM Table (romtab.v)
This module is the sine wave form ROM table. This table converts the phase word input to a sine amplitude output. To conserve area, only ? of the symmetrical sine wave form is stored in the ROM. The sine values stored in this table are the 0 to p/2 unsigned values quantized to 8 bits. Thus, the ROM table requires a 6 bit phase address input and outputs a 7 bit amplitude output. The sinlup module processes the phase and amplitude values to produce a complete sine period.
Dan Morelli has over 9 years of design and management experience. His areas of expertise include spread spectrum communications (involving GPS, TDRSS, and 802.11), PC chip set and system architecture, cell library development (for ECL devices) and ASIC development. He has been published and has multiple patents awarded and pending. Dan currently works for Accelent Systems Inc., an electronic design consulting company, where he is a founder and the VP of Engineering.
附录4:中文译文
数字频率合成器
在探讨许多复杂的相位连续的调制技术中,对模拟电路中输出波形的控制已经越来越困难。在这些设计中,使用非线性数字式设计除去电路板需要的调整额外输出
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