Here are some of the tips for you to shine as an "analog/RF IC design engineer"

Before I provide key technical skills you must have to be an "analog/RF" design engineer let me share with you some of the qualities, characteristics of a true "analog/RF" design engineer

-- Focus, Focus & Focus --> "Analog/RF is a BIG world, it's good to have knowledge about various disciplines in this field, but you must be expert in one of slices of this field. Razor sharp focus is required.
-- Cut through the jargon & talk straight technical --> No BS allowed, rather enjoy the beauty of circuits doing "analogish " tasks
-- Organize yourself --> You need to be disciplined in this task, read lots of ISSCC, CICC papers, analyze them & understand what works and what not
-- Quality is important, Quantity is not --> Analog groups in any company should be a small group of quality people, you can't finish task by putting more headcount. Quality matters, not quantity. Same goes with designs. Some of the great circuits have handful of transistors (5-8) interconnected in brilliant fashion.
-- You need to love what you are doing, not just do it for the sake of social pride!!

Okay, now here is the essential technical skills you must master
Analog field can be broadly classified into 3 segments
a) RF world ; where you will design wireless circuits like LNAs (Low Noise Amplifiers), PAs (Power amplifiers), mixers, oscillators, PLLs etc. You will design narrow band high-Q circuits.
b) Baseband signal processing analog; where you will design broadband analog circuits. These circuits usually comprise of interface ICs like high speed SerDes (Serializers-Deserializers), data converters, precision op-amps, filters, band gap reference circuits, broadband PLLs etc..
c) Power management ICs; where you will design PM ICs like voltage regulators, DC-DC converters, band-gap circuits, low drop out regulators, battery chargers etc..

You need to define your slice & get not just theoretical knowledge but real world practical skills. You must be familiar with block level designs as well as top level integration to effectively deliver it as an IP (Intellectual property block)

knowledge of following IC design aspects is a must no matter your slice
a) small signal analysis
b) current references & voltage references
c) single stage & multistage differential amplifiers
d) Op-amps & OTAs
e) frequency response of amplifiers
f)  stability analysis of amplifiers
g) Noise analysis
f) some device physics knowledge
g) Last but not the least "art of analog layout design"; circuit design is 50% job, another 50% task for your successful design is nice layout. Learn how to do systematic layout, symmetry requirement, common centroid & interdigitating techniques, off-set cancellation, noise prevention & floor planning of your design

This is a long list. If you are a student or novice in this field it will take min 6-months to 1-year to master some of the skills.

Some good reference books
-- Design of Analog CMOS Integrated Circuits by Razavi
-- CMOS Circuit Design, Layout & Simulation by R. Jacob

Finally I would like to say a good analog designer always follows "KISS" principle...which means "keep it simple stupid"...this applies in real world & real world is analog...Smile

Good Luck !