Tugas Akhir

This Final Project deals with design of upconverter block on transceiver for radio-frequency (RF) WiMAX chip. The main problem in this kind of design is to obtain optimum linearity so that satisfying WiMAX specification. However, RF circuit has non-linearity as natural characteristic.

The important component of upconverter block is mixer circuit. Considering direct-conversion transmitter architecture, the design is comparing some circuit topology. Hence, active double-balanced Gilbert cell mixer is chosen. Design is continued by modifying amplifier stage (gain stage) where specific linearity range is needed to accommodate baseband signal level from data converter (Digital-to-Analog Converter) output.

Circuits are implemented in AMS (Austria Micro System) SiGe (Sillicon Germanium) 0.35µm BiCMOS (Bipolar and Complementary Metal Oxide Semiconductor) technology. In this case, design of all active devices is using bipolar junction transistor (BJT). Detailed performances are observed with SIMetrix v5.5 simulator tool.

The goal of the design that is to achieve highly linear upconverter has successfully accomplished. With an IIP3 exceeding 15dBm and 1-dB compression point reaching 5.45dBm, the proposed mixer circuit is well suited for transceiver system. Although noise has not been design issue in transmitter, it is also analyzed and giving SNR of the circuits at 92.01dB.

For approximately 40mW of power consumption, the circuits work at 3.5MHz, 5MHz, 7MHz, 10MHz, 14MHz, 20MHz, and 28MHz input bandwidth. This design meets the need of national WiMAX research since output frequency territories are at 2.3–2.39GHz and 3.3–3.4GHz.

Keywords: mixer, amplifier, upconverter, transmitter, direct conversion, transceiver, WiMAX.

12 Comments

Filed under Engineering

12 responses to “Tugas Akhir

  1. Semangat mam! Do’akan saya juga segera lulus -__-

  2. mien

    smangat sobat!,,,Doakan saya juga segera lulus..

  3. thnx kawan,
    semoga sukses juga ya!
    mudah-mudahan langkah hidup yang kita rencanakan senantiasa mendapat keberkahan dari Allah..

  4. F4154LMAN

    Sukses moel..

  5. smoga dimudahkan….

  6. rickynugrahasetiawan

    Semangat ya, mul
    Insya Allah gw nyusul

  7. arghh,,, topiknya tidak mengerti sayah,,,

    tapi ,, semangadh brother!!!!!

  8. sangbintang

    kapan sidangnyah?:)

  9. Apa kabar???
    sekedar informasi,,, mau ngenalin blog barunya accan. kunjungi yah..

    Accan

  10. @sangbintang
    alhamdulillah sidangnya sudah dilangsungkan kemarin tanggal 18 juni 2009🙂

    @accanoke
    kabar baik. gmn kabar?
    jadi blog yg ‘asli’nya yg mana?

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