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1. 发明授权

US5347176A Analog ramp generator with digital correction 失效
标题翻译：具有数字校正功能的模拟斜坡发生器
公开(公告)号：US5347176A
公开(公告)日：1994-09-13
申请号：US18948
申请日：1993-02-17
申请人： Alan R. Bloom
发明人： Alan R. Bloom
IPC分类号： H03B23/00 , G01R31/28 , H03K4/02 , H03K4/50 , H03K4/90 , H03L7/00 , H03K6/00 , H03K4/08
CPC分类号： H03L7/00 , G01R31/2841 , H03K4/026 , H03K4/90
摘要： An analog ramp signal is used to control the frequency of a swept radio-frequency (RF) test oscillator. The analog ramp signal is generated by applying a fixed reference voltage to an analog integrator circuit. However, ramp accuracy is degraded by integrator gain error, drift, and nonlinearity. To correct for these errors, the analog ramp signal is periodically compared to a digital ramp signal generated by a digital-to-analog converter (DAC) during the course of a sweep. Preferably, the analog ramp signal is compared to the digital ramp signal many times during the course of the sweep. The difference between the two ramp signals is scaled and combined with the reference voltage to correct the slope of the analog ramp signal. An additional DAC preferably adjusts the gain of the feedback loop.
摘要翻译：模拟斜坡信号用于控制扫频射频（RF）测试振荡器的频率。通过向模拟积分电路施加固定的参考电压来产生模拟斜坡信号。然而，积分器增益误差，漂移和非线性降低了斜坡精度。为了纠正这些误差，模拟斜坡信号在扫描过程中与数模转换器（DAC）产生的数字斜坡信号周期性地进行比较。优选地，在扫描过程中将模拟斜坡信号与数字斜坡信号进行多次比较。两个斜坡信号之间的差异被缩放并与参考电压组合以校正模拟斜坡信号的斜率。附加DAC优选地调整反馈回路的增益。

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