一个简单的DDS

采用DDS方法在FPGA上实现频率发生器，最大频率设置在9999Hz，输出正弦波。 DDS是一种从相位概念出发直接合成所需要的波形的新的全数字频率合成技术。同传统的频率合成技术相比，DDS技术具有极高的频率分辨率、极快的变频速度，变频相位连续、相位噪声低，易于功能扩展和全数字化便于集成，容易实现对输出信号的多种调制等优点，满足了现代电子系统的许多要求，因此得到了迅速的发展。

sgt
output_files
incremental_db
db
adder32b.bsf
adder32b.vhd
adder32b.vhd.bak
cnt10.bsf
cnt10.vhd
cnt10.vhd.bak
cos.mif
cos_rom.bsf
cos_rom.cmp
cos_rom.qip
cos_rom.vhd
cos_rom_wave0.jpg
cos_rom_waveforms.html
display.bdf
display.bsf
lpm_add_sub0.bsf
lpm_add_sub0.cmp
lpm_add_sub0.qip
lpm_add_sub0.vhd
lpm_add_sub0_wave0.jpg
lpm_add_sub0_waveforms.html
lpm_add_sub1.bsf
lpm_add_sub1.cmp
lpm_add_sub1.qip
lpm_add_sub1.vhd
lpm_add_sub2.bsf
lpm_add_sub2.cmp
lpm_add_sub2.qip
lpm_add_sub2.vhd
lpm_constant0.bsf
lpm_constant0.cmp
lpm_constant0.qip
lpm_constant0.vhd
lpm_constant1.bsf
lpm_constant1.cmp
lpm_constant1.vhd
lpm_constant2.bsf
lpm_constant2.cmp
lpm_constant2.qip
lpm_constant2.vhd
lpm_constant3.bsf
lpm_constant3.cmp
lpm_constant3.qip
lpm_constant3.vhd
lpm_constant4.bsf
lpm_constant4.cmp
lpm_constant4.qip
lpm_constant4.vhd
lpm_divide0.bsf
lpm_divide0.cmp
lpm_divide0.qip
lpm_divide0.vhd
lpm_divide1.bsf
lpm_divide1.cmp
lpm_divide1.qip
lpm_divide1.vhd
lpm_divide2.bsf
lpm_divide2.cmp
lpm_divide2.qip
lpm_divide2.vhd
lpm_divide3.bsf
lpm_divide3.cmp
lpm_divide3.qip
lpm_divide3.vhd
lpm_mult0.bsf
lpm_mult0.cmp
lpm_mult0.qip
lpm_mult0.vhd
lpm_mult0_wave0.jpg
lpm_mult0_waveforms.html
lpm_mult1.bsf
lpm_mult1.cmp
lpm_mult1.vhd
lpm_mult2.bsf
lpm_mult2.cmp
lpm_mult2.qip
lpm_mult2.vhd
lpm_mult3.bsf
lpm_mult3.cmp
lpm_mult3.qip
lpm_mult3.vhd
lpm_mult4.bsf
lpm_mult4.cmp
lpm_mult4.qip
lpm_mult4.vhd
phase_cal.bdf
phase_cal.bsf
reg32b.bsf
reg32b.vhd
reg32b.vhd.bak
sel4to1.bsf
sel4to1.vhd
sel4to1.vhd.bak
seldisplay.bsf
seldisplay.vhd
setfre.bdf
setfre.bsf
sgt.asm.rpt
sgt.bdf
sgt.done
sgt.dpf
sgt.fit.rpt
sgt.fit.smsg
sgt.fit.summary
sgt.flow.rpt
sgt.jdi
sgt.map.rpt
sgt.map.summary
sgt.pin
sgt.pof
sgt.qpf
sgt.qsf
sgt.qws
sgt.sim.rpt
sgt.sof
sgt.sta.rpt
sgt.sta.summary
sgt.tan.rpt
sgt.tan.summary
sgt.vwf
sgt_assignment_defaults.qdf