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A compact mixer and DAC for implementation of a direct conversion OQPSK transmitter

Chahardori, M ; Sharif University of Technology | 2007

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  1. Type of Document: Article
  2. DOI: 10.1109/TENCON.2007.4429101
  3. Publisher: 2007
  4. Abstract:
  5. A compact low power circuit for implementation of a direct conversion OQPSK modulator is proposed. The circuit consists of a digital to analog converter, a low pass filter and an up-converter mixer. By embedding these three blocks, the circuit performance is enhanced and the total power consumption is reduced. The mixer is designed base on a Gilbert cell with on chip inductor loads. Instead of transconductance transistors of Gilbert cell, a fully deferential current mode DAC is used and proficiently a low pass filter is embedded between them and therefore the linearity of total system is improved. All of circuits are designed based on 0.18 μm CMOS technology with a single 1.8 volt power supply. ©2007 IEEE
  6. Keywords:
  7. CMOS integrated circuits ; Digital integrated circuits ; Digital to analog conversion ; Electric power utilization ; Mixers (machinery) ; Mixing ; Networks (circuits) ; Powders ; Wave filters ; Circuit performances ; CMOS technologies ; Current modes ; Digital to analog ; Digital to analog converter ; Direct conversion ; Gilbert cell ; Gilbert cells ; Low-pass filter ; Low-pass filtering ; Low-power circuits ; On-chip inductors ; OQPSK modulator ; Power supplies ; Total power consumption ; Up-converter mixer ; Direct energy conversion
  8. Source: 2007 IEEE Region 10 Conference, TENCON 2007, Taipei, 30 October 2007 through 2 November 2007 ; 2007 ; 1424412722 (ISBN); 9781424412723 (ISBN)
  9. URL: https://ieeexplore.ieee.org/document/4429101