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1. 发明授权

US4805192A Method and apparatus for pulse code modulation combination chip having an improved autozero circuit 失效
标题翻译：具有改进的自动调零电路的脉冲编码调制组合芯片的方法和装置
公开(公告)号：US4805192A
公开(公告)日：1989-02-14
申请号：US936369
申请日：1986-12-01
申请人： Pierangelo Confalonieri , Daniel Senderowicz , Augusto Tirelli
发明人： Pierangelo Confalonieri , Daniel Senderowicz , Augusto Tirelli
IPC分类号： H03K5/08 , H03M1/00 , H03M1/10 , H04B14/04 , H03M1/12
CPC分类号： H03M1/0607 , H03M1/825
摘要： In a Pulse Code Modulated (PCM) circuit chip, apparatus in the transmit path to compensate for an offset voltage signal from a band-pass filter includes an up-down counter which is actuated to provide a digital value equivalent to the offset signal and a digital to analog converter coupled to the counter to provide an analog signal representing the digital value in the counter. During an initialization phase, the counter is incremented until the digital value of the counter provides, by means of the digital to analog converter, an analog signal that compensates for the off-set signal. After the initialization phase when the band-pass filter's offset voltage is compensated, then other circuitry including an exclusive OR gate and an associated overflow counter are used to eneable or disable the up-down counter to insure that the PCM output signal is an accurate representation of the analog input signal. The up-down counter, during the operation phase following the initialization phase, is only enabled when the analog input signal is not present.
摘要翻译：在脉冲编码调制（PCM）电路芯片中，用于补偿来自带通滤波器的偏移电压信号的传输路径中的装置包括被启动以提供与偏移信号等效的数字值的升降计数器，以及数模转换器耦合到计数器以提供表示计数器中的数字值的模拟信号。在初始化阶段期间，计数器递增，直到计数器的数字值通过数模转换器提供补偿偏移信号的模拟信号。在对带通滤波器的偏移电压进行补偿的初始化阶段之后，使用包括异或门和相关联的溢出计数器的其它电路来使能或禁止升降计数器，以确保PCM输出信号是准确的表示的模拟输入信号。在初始化阶段之后的运行阶段，只有当模拟输入信号不存在时，才能使能上拉计数器。

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