Start reading the following books:
-Fundamentals of Microelectronics by Behzad Razavi
-Design of Analog CMOS Integrated Circuits by Behzad Razavi
FOm more advacned topics you should start reading dedicated books such as
-Design of Integrated Circuits for Optical Communications by Behzad Razavi
-RF Microelectronics by Behzad Razavi
-Phase-Locking in High-Performance Systems: From Devices to Architectures by Behzad Razavi
The author explains all topics in very simple way and therefore I do believe it could be worth to read his books
Go for web "Electronics BasicsA Basic Introduction to Filters - active, passive and switched capacitor filters, document in PDF format; Alex's Electronic Resource Library - collection of ...
icc.skku.ac.kr/~won/electro/basics.html - 56k"