Switched capacity circuit structures of gradient methods are proposed,the common properties of the steepest descent method, Newton method and quas Newton methods are analysed.

• 建立了梯度法的开关电容电路结构，分析了最速下降法、牛顿方法和拟牛顿法的共同特点，研究无约束差分优化的开关电容电路结构。