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1.发明授权Intermediate frequency (IF) sampling clock-to-clock auto-ranging analog-to-digital converter (ADC) and method 失效中频（IF）采样时钟到时钟自动量程模数转换器（ADC）和方法
公开(公告)号：US5861831A
公开(公告)日：1999-01-19
申请号：US772358
申请日：1996-12-23
CPC分类号： H03M1/186
摘要： A clock-to-clock auto-ranging ADC operates directly on an analog signal in the IF band or higher to track its gain range on a clock-to-clock basis and produce a digital signal that maintains high resolution of the analog signal without clipping or loss of signal sensitivity. This is accomplished by sampling an analog signal of sufficiently high frequency that a peak detector can accurately determine the maximum signal level over at least one-half a signal period and then reset the signal gain going into the ADC prior to the beginning of the next sampling period. This insures that the analog signal will always be within the range of the ADC. In accordance with the well known principles of sampling theory, the sampled analog signal is aliased into the frequency region between DC and one half the sampling frequency.
摘要翻译： 时钟到时钟自动量程ADC直接在IF频带或更高的模拟信号上进行操作，以便在时钟基础上跟踪其增益范围，并产生数字信号，保持模拟信号的高分辨率，无需剪辑 或信号灵敏度损失。 这通过对具有足够高频率的模拟信号进行采样来实现，峰值检测器可以在至少半个信号周期上精确地确定最大信号电平，然后在下一个采样开始之前复位进入ADC的信号增益 期。 这确保模拟信号始终在ADC的范围内。 根据众所周知的抽样原理，采样模拟信号被混叠到DC与采样频率的一半之间的频率区域。
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公开(公告)号：US06294902B1
公开(公告)日：2001-09-25
申请号：US09637807
申请日：2000-08-11
申请人： Carl W. Moreland , Marvin J. Young
发明人： Carl W. Moreland , Marvin J. Young
IPC分类号： G05F140
CPC分类号： G05F3/30
摘要： A bandgap reference circuit provides an output reference voltage that is generally insensitive to fluctuations in supply voltage, ambient temperature, and output load current. A current regulator establishes an output whose variations are reduced, preferably logarithmically, relative to variations in a supply voltage. A bandgap generator fed by the output current provides an output reference voltage with similarly suppressed variations. A control amplifier biases the bandgap generator to provide a high level common-mode rejection of various error sources.
摘要翻译： 带隙参考电路提供对电源电压，环境温度和输出负载电流波动通常不敏感的输出参考电压。 电流调节器建立相对于电源电压变化优选对数减小的输出。 由输出电流馈送的带隙发生器提供具有类似抑制变化的输出参考电压。 控制放大器偏置带隙发生器以提供各种误差源的高电平共模抑制。
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公开(公告)号：US4839407A
公开(公告)日：1989-06-13
申请号：US153118
申请日：1988-02-08
摘要： A method for preparation of solid particulate polyacetal carboxylate. The method comprises agglomerating a solution comprising less than about 1% by weight methanol and between about 30% by weight and about 60% by weight polyacetal carboxylate onto a substrate to produce a free-flowing particulate solid. The solid comprises between about 30% by weight and about 55% by weight polyacetal carboxylate. The polyacetal carboxylate corresponds to the formula: ##STR1## where n is at least about 4 and represents the average chain length of the polyacetal carboxylate in the mixture, R.sub.1 and R.sub.2 are independently selected chemically stable groups that stabilize the polymer against rapid depolymerization in alkaline solution, and M is selected from the group consisting of alkali metals, ammonium, alkyl groups of 1 to about 4 carbon atoms, tetraalkyl ammonium groups, and alkanolamine groups having from 1 to about 4 carbon atoms in the alkyl chain.
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