The LH0002， LH0033 and LH0063 are wide-band， high current， unity gain buffer amplifiers. They are intended for use alone or in closed-loop combination with op amps to drive co-axial cables and capacitive or other high-current loads. Features and characteristics of these buffers are summarized in Table I. All are active trimmed for low unadjusted output offset voltage and uniform performance. Good thermal coupling between dice is achieved by hybrid thick-film construction on ceramic substrates. Part I analyzes the AC and DC equivalent circuits. Part II is a comprehensive guide to applications techniques and shows how to get optimum performance under a variety of circumstances. Finally， Part III illustrates these techniques in some specific applications including drivers， sample-and-hold amplifiers and active filters.