The designers of these circuits based them on the same concept: a fully integrated, single-die-IC switching regulator and a micropower operational amplifier.
Pei-Chi Chang, Sheng-Jye Hwang, Huei-Huang Lee, Durn-Yuan Huang, "A Study on the Adhesion Between EMC and IC Encapsulation Mold", Automation Conference, P180 (2003).
Sometimes it is said that discrete power amplifier design is rather unenterprising, given the enormous outpouring of ingenuity in the design of analogue ICs.
95 Abstract With the rapid development of the IC manufacture, the critical dimension(CD) of the manufacturable CMOS technology has been put into 90nm, even 65nm and below from 130nm.
For one is beautiful is the brand, from direct current to gigacycle per second analogy, the composite signal, the radio frequency, the optical fiber, the micro controller and corresponds IC to have.