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A 5 GHz, 1.5 Volt and very low-power cmos frequency synthesizer for wireless communications

Mirzaei, A ; Sharif University of Technology | 2002

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  1. Type of Document: Article
  2. Publisher: 2002
  3. Abstract:
  4. A 5GHz, 1.5 Volt and low power CMOS frequency synthesizer with LC-tuned VCO (voltage controlled oscillator) is presented. The synthesizer consists of an LC-tuned VCO, an injection-lock frequency divider, a very low power prescaler which brings 2.5GHz range frequency to 11 MHz, a phase-frequency detector and charge-pump with improved architecture. Spiral inductors with Q-factor of 9 are used for the LC-tuned 5 GHz VCO. A fixed 2 frequency divider based on injection-locking phenomenon is used to bring 5 GHz VCO frequency to 2.5GHz. Both VCO and injection-locked divider's oscillators are tuned with NMOS varactors with their bodies are grounded, resulting in about 700 MHz tuning range. Implemented in 0.25u standard CMOS process, the synthesizer consumes only 13.5mW with a single 1.5V supply
  5. Keywords:
  6. Frequency synthesizers ; Q factor ; Inductors ; Spirals ; Charge pumps ; Phase detection ; Phase frequency detector ; Frequency conversion ; Voltage-controlled oscillators ; Wireless communication
  7. Source: 2002 45th Midwest Symposium on Circuits and Systems, Tulsa, OK, 4 August 2002 through 7 August 2002 ; Volume 3 , 2002 , Pages III536-III539
  8. URL: https://ieeexplore.ieee.org/document/1187092