片上三角波信号发生器实现方法

Implementation of On-Chip Triangle-Wave Signal Generator

针对混合信号电路内建自测试(BIST)结构中信号发生器的设计问题,本文提出了一种基于码密度直方图法测量模-数转换器性能的片上模拟三角波信号发生器的实现方法。该信号发生器由两个恒流源、电容和反馈控制电路组成,其中恒流源采用自偏压的Widlar电流源实现。实验结果表明,该信号发生器所生成的三角波信号不仅斜波部分具有良好的性线,而且其频率和幅值均可调。另外,该信号发生器结构精简,硬件开销小,易于片上集成。

In the context of mixed-signal BIST architecture for analog-to-digital converters, this paper presents an implementation of an on-chip triangle-wave signal generator used for the histogram-based test technique. The structure of generator composs of two constant current, one capacitor and one feedback control circuit, in which the constant currents are implemented with self-biased Widlar current sources. Results of experiment show that the proposed structure not only preserves the linearity of the ramp signal, but also has the accuracy and adaptive of the triangle-wave signal which are provided by means of a facilitative calibration scheme. In addition, the implementation of whole circuit exhibits a very small silicon area.