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1. 发明授权

US5162801A Low noise switched capacitor digital-to-analog converter 失效
标题翻译：低噪声开关电容数模转换器
公开(公告)号：US5162801A
公开(公告)日：1992-11-10
申请号：US801145
申请日：1991-12-02
申请人： Scott R. Powell , Anthony G. Mellissinos
发明人： Scott R. Powell , Anthony G. Mellissinos
IPC分类号： H03M1/08 , H03M1/74 , H03M1/76
CPC分类号： H03M1/765
摘要： A low-noise switched-capacitor DAC converts an integer number from an N-bit digital format into an analog voltage level by transferring charge between two appropriately ratioed capacitors using a plurality of switches. The switches select only an appropriate one of a plurality of capacitors to connect to an operational amplifier in accordance with any digital input. The sampled kT/C noise and switch charge injection from an N-bit DAC is thus beneficially reduced.
摘要翻译：低噪声开关电容DAC通过使用多个开关在两个适当比例的电容器之间传输电荷，将整数从N位数字格式转换为模拟电压电平。开关仅根据任何数字输入选择多个电容器中适当的一个以连接到运算放大器。因此，有利地减少了来自N位DAC的采样kT / C噪声和开关电荷注入。

2. 发明授权

US5644257A Sampling circuit charge management 失效
标题翻译：采样电路充电管理
公开(公告)号：US5644257A
公开(公告)日：1997-07-01
申请号：US635570
申请日：1996-04-22
申请人： Donald A. Kerth , Dan B. Kasha , Eric J. Swanson , Anthony G. Mellissinos
发明人： Donald A. Kerth , Dan B. Kasha , Eric J. Swanson , Anthony G. Mellissinos
IPC分类号： G06G7/14 , G11C27/02 , H03K5/24 , H03K5/159 , G06G7/10
CPC分类号： G11C27/024 , G06G7/14 , G11C27/02 , H03K5/2481 , H03K5/249
摘要： The detrimental nonlinear charging currents from an analog input signal through an anti-aliasing filter into a sampling circuit can be minimized by using primary and secondary inputs to the sampling circuit. The secondary input is turned on before the primary input and the charge required to charge the parasitic capacitance inside the sampling circuit and to replenish the channeling charge lost in the previous cycle is supplied primarily through the secondary input. Immediately after the secondary input is turned off the primary input is connected to the sampling node, and only the charge required to fine tune the signal into the sampling capacitor is drawn through the primary input. Therefore, most of the non-linear charge injection is passed through the secondary input, and the signal passed through the primary input is used to fine tune the voltage levels inside the sampling circuit during the actual sampling operation.
摘要翻译：通过使用初级和次级输入到采样电路，可以将模拟输入信号通过抗混叠滤波器到采样电路的有害非线性充电电流最小化。辅助输入在主输入之前被接通，并且为采样电路内的寄生电容充电所需的电荷和补充前一周期中丢失的通道电荷主要通过次级输入提供。在二次输入关闭之后，主输入端立即连接到采样节点，只有通过主输入才能将信号微调到采样电容器中所需的电荷。因此，大多数非线性电荷注入通过二次输入，并且通过主输入的信号用于在实际采样操作期间微调采样电路内部的电压电平。

3. 发明授权

US5331217A Low power integrated circuit white noise source 失效
标题翻译：低功耗集成电路白噪声源
公开(公告)号：US5331217A
公开(公告)日：1994-07-19
申请号：US900965
申请日：1992-06-18
申请人： Anthony G. Mellissinos
发明人： Anthony G. Mellissinos
IPC分类号： H03B29/00 , H03K4/00 , H03B1/00
CPC分类号： H03B29/00
摘要： A low power white noise source is fabricated on an integrated circuit. The noise source includes a bipolar junction transistor (Q.sub.BJT) having an emitter terminal coupled to a common circuit potential, a collector terminal coupled to a source of current (CS), and a base terminal coupled through a resistance (R.sub.B) to a bias signal (V.sub.bias). The resistance has a resistance value selected to enhance a noise signal generated by the transistor in a collector current thereof. The noise source further includes a transresistance amplifier (AMP) having an input coupled to the collector terminal for converting the noise signal to a voltage signal (NOISE OUT) having white noise characteristics.
摘要翻译：在集成电路上制造低功率白噪声源。噪声源包括具有耦合到公共电路电位的发射极端子的双极结型晶体管（QBJT），耦合到电流源（CS）的集电极端子，以及通过电阻（RB）耦合到偏置信号的基极端子（Vbias）。该电阻具有选择的电阻值以增强晶体管在其集电极电流中产生的噪声信号。噪声源还包括一个跨阻放大器（AMP），其具有耦合到集电极端子的输入端，用于将噪声信号转换成具有白噪声特性的电压信号（NOISE OUT）。

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