公开(公告)号：US06313769B1

公开(公告)日：2001-11-06

申请号：US09563874

申请日：2000-05-03

申请人： Mandell J. Mangahas ,  Ramin Khoini-Poorfard

发明人： Mandell J. Mangahas ,  Ramin Khoini-Poorfard

IPC分类号： H03M106

CPC分类号： H03M1/1019 ,  H03M1/66

摘要： A signal processing system includes a main digital-to-analog converter (DAC) for receiving a digital baseband signal and converting the digital signal into an analog signal. Also included in the system is a connection circuit for receiving the analog signal, and output terminal, and an analog filter coupled between the connection circuit and the output terminal for filtering the analog signal. The system includes a calibration circuit coupled between the connection circuit and the output terminal for setting an offset voltage level. The calibration circuit includes (a) an approximation circuit coupled to the output terminal and operable during a calibration mode to determine the offset voltage level and store the offset voltage level as a digital offset signal and (b) an offset DAC coupled between the connection circuit and the approximation circuit for converting the digital offset signal into the offset voltage level. The connection circuit, which is a node, subtracts the offset voltage level from the analog signal.

摘要翻译： 信号处理系统包括用于接收数字基带信号并将数字信号转换为模拟信号的主数/模转换器（DAC）。 该系统还包括用于接收模拟信号的连接电路和输出端子，以及耦合在连接电路和输出端子之间的模拟滤波器，用于对模拟信号进行滤波。 该系统包括耦合在连接电路和输出端子之间的校准电路，用于设定偏移电压电平。 校准电路包括（a）耦合到输出端并且可在校准模式期间操作以确定偏移电压电平并将偏移电压电平存储为数字偏移信号的近似电路，以及（b）耦合在连接电路 以及用于将数字偏移信号转换为偏移电压电平的近似电路。 作为节点的连接电路从模拟信号中减去偏移电压电平。