公开(公告)号：US08829995B2

公开(公告)日：2014-09-09

申请号：US14021834

申请日：2013-09-09

Applicant: Applied Micro Circuits Corporation

Inventor： Hanan Cohen

IPC: H03F3/45

CPC classification number: H03G3/3078 ,  H03F3/45183 ,  H03F3/45197 ,  H03F2200/408 ,  H03F2200/435 ,  H03F2200/447 ,  H03F2203/45296 ,  H03F2203/45298 ,  H03F2203/45374 ,  H03F2203/45631 ,  H03F2203/45686 ,  H03F2203/45702

Abstract: A method is provided for process, voltage, temperature (PVT) stable transfer function calibration in a differential amplifier. The gain resistors of a differential amplifier are initially selected to achieve a flat amplitude transfer function in the first frequency band. After calibration, the degeneration capacitor is connected and tuned until a peaked amplitude transfer function is measured, which is resistant to variations in PVT. As an alternative, the degeneration capacitor is not disconnected during initial calibration. Then, the gain resistors and the degeneration capacitor values are selectively adjusted until the first peaked amplitude transfer function is obtained. The peaked amplitude transfer function remains even more stable to variations in PVT than the flat amplitude calibration method.

Abstract translation: 提供了差分放大器中的过程，电压，温度（PVT）稳定传递函数校准的方法。 最初选择差分放大器的增益电阻以在第一频带中实现平坦的幅度传递函数。 校准后，连接并调谐退化电容，直到测量出峰值的幅度传递函数，这抵消了PVT的变化。 作为替代方案，在初始校准期间，退化电容器不断开。 然后，选择性地调节增益电阻器和退化电容器值，直到获得第一峰值幅度传递函数。 峰值幅度传递函数对于PVT的变化比平坦幅度校准方法保持更稳定。