专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US4843339A Isolation amplifier including precision voltage-to-duty-cycle converter and low ripple, high bandwidth charge balance demodulator 失效
标题翻译：隔离放大器包括精密电压 - 占空比转换器和低纹波，高带宽电荷平衡解调器
公开(公告)号：US4843339A
公开(公告)日：1989-06-27
申请号：US114654
申请日：1987-10-28
申请人： Rodney T. Burt , Robert M. Stitt, II
发明人： Rodney T. Burt , Robert M. Stitt, II
IPC分类号： H03K9/08 , C08F220/04 , H03F3/217 , H03F3/38 , H03F3/387 , H03K7/08
CPC分类号： C08F220/04 , H03F3/387 , H03K7/08
摘要： An isolation amplifier includes a voltage-to-duty-cycle modulator, a non-galvanic isolation barrier, and a demodulator converting a duty-cycle-modulated signal transmitted across the isolation barrier to an analog voltage replica of the analog input voltage. The modulator circuit includes a first current switching means which produces a first current that is switched between positive and negative values in response to an output from a comparator that can be referenced to a noise-synchronized signal. The first current is summed with an input current and the difference is integrated and input to the comparator, the output of which produces the duty-cycle-modulated signal. The demodulator includes a second current switching circuit for producing a second current that is switched between positive and negative levels in response to the duty-cycle-modulated signal received across the isolation barrier and includes circuitry for algebraically summing the input current with the second current and integrating the result to produce the analog output voltage. The modulator circuit and demodulator circuits are fabricated on a single semiconductor area to produce the close matching between components of the first and second current switching circuits. The area is cut in half to produce two chips, which are connected to two isolation barrier capacitors. In the demodulator, a sample and hold circuit synchronized with the duty-cycle-modulated signal transmitted across the isolation barrier samples the output of the integrator.
摘要翻译：隔离放大器包括电压 - 占空比调制器，非电流隔离屏障和将跨隔离屏障传输的占空比调制信号转换为模拟输入电压的模拟电压副本的解调器。调制器电路包括第一电流开关装置，其响应于可以参考噪声同步信号的比较器的输出产生在正值和负值之间切换的第一电流。第一个电流与输入电流相加，差值被积分并输入到比较器，比较器的输出产生占空比调制信号。解调器包括第二电流切换电路，用于响应于在隔离屏障上接收的占空比调制信号产生在正电平和负电平之间切换的第二电流，并且包括用于将输入电流与第二电流进行代数求和的电路，以及将结果积分以产生模拟输出电压。调制器电路和解调器电路制造在单个半导体区域上，以产生第一和第二电流开关电路的部件之间的紧密匹配。该区域被切成两半以产生两个芯片，它们连接到两个隔离屏蔽电容器。在解调器中，与隔离屏障上传输的占空比调制信号同步的采样和保持电路对积分器的输出进行采样。

2. 发明授权

US4792748A Two-terminal temperature-compensated current source circuit 失效
标题翻译：两端温度补偿电流源电路
公开(公告)号：US4792748A
公开(公告)日：1988-12-20
申请号：US121652
申请日：1987-11-17
申请人： David M. Thomas , Rodney T. Burt , Robert M. Stitt, II
发明人： David M. Thomas , Rodney T. Burt , Robert M. Stitt, II
IPC分类号： H03F3/343 , C08F8/20 , G05F3/30 , H03F1/30 , H03F3/34 , H03F3/347 , G05F3/26
CPC分类号： G05F3/30 , C08F8/20 , Y10S323/907
摘要： A two-terminal temperature-compensated current source includes a first transistor having its emitter connected to a first terminal, its base connected to the base of a second transistor, and its collector coupled to a current mirror. The second transistor has its emitter coupled to the first terminal by a first resistor and its collector coupled to the current mirror. A second resistor is coupled between the first terminal and the base of the first transistor. The current mirror is coupled between a second terminal and the collectors of the first and second transistors so that all current supplied to the current mirror from the second terminal flows into the collectors of the first and second transistors. A third transistor has its base coupled to the collector of the first transistor, its emitter coupled to the base of the first transistor, and its collector coupled to the second terminal. The current in the first resistor has a positive temperature coefficient, and the current in the second resistor has a negative temperature coefficient. The temperature coefficient of the total current flowing between the first and second terminals is adjusted by adjusting the ratio between the first and second resistors.
摘要翻译：两端温度补偿电流源包括其发射极连接到第一端子的第一晶体管，其基极连接到第二晶体管的基极，并且其集电极耦合到电流镜。第二晶体管的发射极通过第一电阻器耦合到第一端子，并且其集电极耦合到电流镜。第二电阻器耦合在第一晶体管的第一端子和基极之间。电流镜耦合在第二端子和第一和第二晶体管的集电极之间，使得从第二端子提供给电流镜的所有电流流入第一和第二晶体管的集电极。第三晶体管的基极耦合到第一晶体管的集电极，其发射极耦合到第一晶体管的基极，其集电极耦合到第二晶体管。第一电阻器中的电流具有正温度系数，并且第二电阻器中的电流具有负温度系数。通过调整第一和第二电阻器之间的比例来调节在第一和第二端子之间流动的总电流的温度系数。

3. 发明授权

US4904951A Method and circuit for reducing effects of distributed capacitance associated with large thin film resistors 失效
标题翻译：减小与大薄膜电阻相关的分布电容效应的方法和电路
公开(公告)号：US4904951A
公开(公告)日：1990-02-27
申请号：US203250
申请日：1988-06-06
申请人： Johnnie F. Molina , Robert M. Stitt, II
发明人： Johnnie F. Molina , Robert M. Stitt, II
IPC分类号： H01C7/00 , H01L21/822 , H01L27/04 , H03F3/45 , H03H7/18
CPC分类号： H03F3/45479 , H03H7/18
摘要： A technique for reducing phase shift of a signal passing through a large thin film resistor on an insulating layer includes applying a signal to one terminal of the thin film resistor and also to one end of an underlying doped epitaxial region. The opposite terminal of the thin film resistor is connected to a virtual ground or virtual reference voltage produced by an inverting input of an operational amplifier. The corresponding opposite end of the epitaxial layer is connected to ground or other reference voltage. The voltage gradients produced by currents flowing through both the thin film resistor and the epitaxial layer are equal, so that substantially no incremental charging current flows through capacitance between the thin film resistor and the epitaxial layer. Phase shift of the signal flowing through the thin film resistor is thereby avoided.
摘要翻译：用于减小通过绝缘层上的大薄膜电阻器的信号的相移的技术包括将信号施加到薄膜电阻器的一个端子以及下掺杂的外延区域的一端。薄膜电阻器的相对端子连接到由运算放大器的反相输入端产生的虚拟参考电压或虚拟参考电压。外延层的对应的相对端连接到地或其他参考电压。通过流过薄膜电阻器和外延层的电流产生的电压梯度相等，使得基本上没有增量的充电电流流过薄膜电阻器和外延层之间的电容。从而避免了流过薄膜电阻器的信号的相移。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式