Introduction to CMOS OP-AMPs and Comparators Roubik Gregorian ISBN: 978-0-471-31778-4 Hardcover 376 pages February 1999 US $151.95 Add to Cart This price is valid for United States. Change location to view local pricing and availability. This is a Print-on-Demand title. It will be printed specifically to fill your order. Please allow an additional 5-6 days delivery time. The book is not returnable.