TICS PRO配置如下:
在所需频端周围出现很多杂波,测试窄带频谱图(Max Hold)和全频带频谱图如下:
修改 Desired Duration,没有很大的效果。
1. 请问是什么原因导致的呢?
2. 请问有何改进方法?
非常感谢!
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You are sweeping the VCO frequency between 7700MHz and 8200MHz, the sweep range is 500MHz, as such, multiple VCO calibrations are required during sweep. You have setup VCO calibration every 100MHz sweep, this setup should be ok but you did not setup enough time for the calibration. Suggest put at least 50µs in the Min. VCO Calibration Time field.
Since multiple VCO calibrations are required in order to support 500MHz sweep, the sweep is not a linear frequency sweep. If you are looking for linear sweep, we have to limit to sweep range to around 100MHz.
The RST bit is not needed as the end frequency of RAMP1 is equal to the start frequency of RAMP0.
对应的中文是:
您正在扫描7700MHz 和8200MHz 之间的 VCO 频率,扫频范围为500MHz,因此,扫频期间需要多个 VCO 校准。 您每扫描100MHz 就设置一次 VCO 校准,此设置应该可以,但您没有为校准设置足够的时间。 建议在Min VCO Calibration Time 中至少加50µs。
由于支持500MHz 扫描需要多个 VCO 校准,因此扫描不是线性频率扫描。 如果您正在寻找线性扫描,我们必须将扫描范围限制在100MHz 左右。
不需要 RST 位,因为 RAMP1的结束频率等于 RAMP0的开始频率。
For waveforms that are NOT calibration free, the slew rate of the ramp must be kept less than 250 kHz/µs. Also,
for all automatic ramping waveforms, be aware that there is a very small phase disturbance as the VCO crosses
over the integer boundary, so one might consider using the input multiplier to avoid these or timing the VCO
calibrations at integer boundaries.