Newcom Department 3 stanbul Meeting 6 September 2004

Newcom Department 3 İstanbul Meeting 6 September 2004 Işık University, İstanbul

Participating Partners • • • POLITO (Giovanni Ghione) Chalmers (Thomas Eriksson) UU (Erik Öjefors) ISIK (Ahmet Aksen, Sıddık Yarman) Bilkent (Abdullah Atalar, Tarık Reyhan) Excused: CTTC, TUI and Uo. P

Meeting Agenda • • Welcome, agreement on agenda Overview and status of WPR 3 activities Discussion on Deliverable DR 1 Discussion on future actions/activities to make WP 3 successful • Workshop: – Lecture by Giovanni Ghione on “Nonlinearity characterization and modeling” – Lunch

Meeting Agenda (cont. ) • Workshop continued: – Lecture by Thomas Eriksson on “it++” – Tea/coffee break – Lecture by Erik Öjefors on “Integrated antennas” – Tea/coffee break – Lecture by Sıddık Yarman on “Impedance matching and modeling using real frequency techniques”

Overview and status of WPR 3 activities • Kickoff meeting of Leuven, 18 June 2004 • Eight partners participated and made presentations to describe their research areas • 4 clusters formed: – Nonlinearity of power amplifiers (Chalmers, POLITO, Bilkent, Uo. P, ISIK, CTTC) – Antennas (UU, TUI, CTTC, ISIK) – Phase Noise (Bilkent, Chalmers, POLITO) – RFIC Front ends (Uo. P, UU, TUI)

Overview and status of WPR 3 activities (cont. ) • A mail reflector is formed: wpr 3@lists. bilkent. edu. tr • A web page is prepared: www. ee. bilkent. edu. tr/~newcomd 3 (contains the presentations of kickoff meeting)

Overview and status of WPR 3 activities (cont. ) • it++ developed by Chalmers can be a common ground (GNU License) – This afternoon Thomas Eriksson of Chalmers will make a presentation on it++

Overview and status of WPR 3 activities (cont. ) • 2 partners (Supelec and PUT) are not participating)

Discussion on future actions/activities to make WP 3 successful

Discussion on future actions/activities to make WP 3 successful • Our success will be measured by the Degree of integration

Discussion (cont. ) • Degree of integration is measured by – Number of Ph. D students in training activities – Number of Ph. D students in exchange programs – Number of people in NEWCOM workshops – Number of jointly submitted papers – Number of jointly supervised Ph. D students

Discussion (cont. ) • Degree of integration is measured by – Number of commonly evaluated Ph. D theses – Number of joint patents – Number of partners providing shared equipment – Number of other students participating in exchange

Ph. D Student Exchange • • • Housing cost is provided by NEWCOM Which partners can accept students? Which partners can provide students? For how long? Difficulty of sending a student to another place (is it just a lost time for the sending institution? ) • Is language a problem?

Deliverable DR 1 • DR 1 date is delayed by 1. 5 months • To be prepared: – Related publications with abstracts – Related patents – Completed/ongoing projects – Available measuring equipment, design/analysis software – Courses given on related areas (with detailed syllabus, language of instruction)

Deliverable DR 1 (cont. ) – Required know-how to complete WPR 3 objectives – Identification of gaps among WPR 3 participants (needs to be done through four clusters) – Detailed plan for encountering gaps (needs to be done through four clusters) • So far 3 partners provided the contributions (TUI, UU, ISIK)

NEWCOM WPR 3 Workshop

Nonlinearity of power amplifiers • Nonlinearity? – At the input f 1 – At the output (f 1) (2 f 1) (3 f 1) (4 f 1) …. (nf 1) – Relatively easy to filter if system bandwidth is not too big.

Nonlinearity of power amplifiers • Why is it important? – Modern communication systems use multicarriers. – At the input: f 1 + f 2 – At the output: (mf 1 + nf 2) (m+n th order) – Among them most troublesome: 3 rd order (IM 3) 2 f 1 - f 2 or 2 f 2 - f 1

Nonlinearity of power amplifiers • IM 3 Example: – f 1 + f 2 : 2420 MHz + 2430 MHz – 2 f 1 - f 2 : 2410 MHz – 2 f 2 - f 1 : 2440 MHz

Nonlinearity of power amplifiers • Typical power amplifer operates in Class A or Class AB. (In Class AB amplifier’s DC current increases with increasing drive). • What can be done to reduce nonlinearity? – Use the power amplifier at a lower signal level or with a higher bias at the expense of reduced efficiency – Use predistortion/linearization methods

Linearization techniques · Feedforward Linearization · Cartesian Feedback · RF Predistortion · Digital Predistortion

Nonlinearity of power amplifiers • Predistortion/cancellation methods are expensive or are not very efficient: Suitable for base stations • For mobile systems efficiency is very important. • Comprimise between efficiency and linearity: Bias as low as possible to increase efficiency, sufficiently high to reduce IM 3

Nonlinearity of power amplifiers • State-of-the-art: What is done? – Each device is measured for allowable IM 3 at each channel – Input level and bias is adjusted to satisfy the specs for highest efficiency – Input level and bias values are stored in a lookup table that contains also temperature variations

Giovanni Ghione • Professor of Politecnico di Torino – Book: Noise in semiconductor devices: Modeling and simulation • Nonlinearity characterization and modeling