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公开(公告)号：EP0511858A3
公开(公告)日：1995-02-15
申请号：EP92303886.3
申请日：1992-04-30
发明人： Nguyen, Chinh D. , Hsu, Wei-Chan
IPC分类号： H03M1/66 , H03M1/08 , H03K19/003
CPC分类号： H03M1/0631 , H03M1/0863
摘要： In a digital-to-analog converter (DAC) current source including a current mirror, an output transistor biased by a reference voltage and a steering transistor, a structure and a method are provided to implement the DAC current source without current spikes in the output current. Current spikes in the output current are avoided by including a transistor acting as a low-pass filter between the steering transistor and the output transistor. In one embodiment, the DAC current source circuit is implemented by PMOS transistors.
摘要翻译： 在包括电流镜，由参考电压偏置的输出晶体管和导向晶体管的数模转换器（DAC）电流源中，提供了一种结构和方法来实现DAC电流源，而输出端没有电流尖峰 当前。 通过在导向晶体管和输出晶体管之间包含充当低通滤波器的晶体管来避免输出电流中的电流尖峰。 在一个实施例中，DAC电流源电路由PMOS晶体管实现。
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公开(公告)号：EP0511857A2
公开(公告)日：1992-11-04
申请号：EP92303885.5
申请日：1992-04-30
发明人： Hsu, Wei-Chan , Chiu, Wei-Kuang J.
摘要： A dual sense amplifier structure and a method are provided in a RAMDAC, to allow the video path to be probed digitally during testing. Each of the two sets of sense amplifiers in the dual sense amplifier structure can be individually enabled to provide the same output data to both a color value register accessible over a data port and the digital-to-analog converters for interface with an analog display. In one embodiment, the sense amplifiers which provide color values to a data port interfaced with the CPU are implemented by simpler circuits than the sense amplifiers which used to provide the color values to the DACs.
摘要翻译： 在RAMDAC中提供双重放大器结构和方法，以允许在测试期间数字地探测视频路径。 双读出放大器结构中的两组读出放大器中的每一个可以单独启用，以向数据端口可访问的色值寄存器和与模拟显示器接口的数模转换器提供相同的输出数据。 在一个实施例中，通过比用于向DAC提供颜色值的读出放大器更简单的电路来实现向连接到CPU的数据端口提供色值的读出放大器。
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公开(公告)号：EP0511857A3
公开(公告)日：1993-09-29
申请号：EP92303885.5
申请日：1992-04-30
发明人： Hsu, Wei-Chan , Chiu, Wei-Kuang J.
摘要： A dual sense amplifier structure and a method are provided in a RAMDAC, to allow the video path to be probed digitally during testing. Each of the two sets of sense amplifiers in the dual sense amplifier structure can be individually enabled to provide the same output data to both a color value register accessible over a data port and the digital-to-analog converters for interface with an analog display. In one embodiment, the sense amplifiers which provide color values to a data port interfaced with the CPU are implemented by simpler circuits than the sense amplifiers which used to provide the color values to the DACs.
摘要翻译： 在RAMDAC中提供双重放大器结构和方法，以允许在测试期间数字地探测视频路径。 双读出放大器结构中的两组读出放大器中的每一个可以单独启用，以向数据端口可访问的色值寄存器和与模拟显示器接口的数模转换器提供相同的输出数据。 在一个实施例中，通过比用于向DAC提供颜色值的读出放大器更简单的电路来实现向连接到CPU的数据端口提供色值的读出放大器。
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公开(公告)号：EP0511858A2
公开(公告)日：1992-11-04
申请号：EP92303886.3
申请日：1992-04-30
发明人： Nguyen, Chinh D. , Hsu, Wei-Chan
IPC分类号： H03M1/66 , H03M1/08 , H03K19/003
CPC分类号： H03M1/0631 , H03M1/0863
摘要： In a digital-to-analog converter (DAC) current source including a current mirror, an output transistor biased by a reference voltage and a steering transistor, a structure and a method are provided to implement the DAC current source without current spikes in the output current. Current spikes in the output current are avoided by including a transistor acting as a low-pass filter between the steering transistor and the output transistor. In one embodiment, the DAC current source circuit is implemented by PMOS transistors.
摘要翻译： 在包括电流镜，由参考电压偏置的输出晶体管和转向晶体管的数模转换器（DAC）电流源中，提供结构和方法来实现DAC电流源，而不会在输出中产生电流尖峰 当前。 通过在转向晶体管和输出晶体管之间包括充当低通滤波器的晶体管来避免输出电流的电流尖峰。 在一个实施例中，DAC电流源电路由PMOS晶体管实现。
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公开(公告)号：EP0511856A1
公开(公告)日：1992-11-04
申请号：EP92303884.8
申请日：1992-04-30
CPC分类号： H03F3/45192 , G05F1/575 , H03F2203/45028 , H03F2203/45182 , H03F2203/45244 , H03F2203/45478
摘要： A reference generator system that operates in either a current-controlled mode or a voltage-controlled mode and includes a power-down circuit connected to the operational amplifier to power down the operational amplifier when the reference generator is switched to the current-controlled mode.
摘要翻译： 一种参考发生器系统，其以电流控制模式或电压控制模式工作，并且包括连接到运算放大器的掉电电路，以在参考发生器切换到电流控制模式时将运算放大器断电。
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