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Low-Phase-Noise 18-GHz Voltage-Controlled Oscillator

Elettronica delle microonde e delle onde millimetriche – A1. Low-Phase-Noise 18-GHz Voltage-Controlled Oscillator. Angelo Scuderi and Giuseppe Palmisano Radio Frequency Advanced Design Center (RF-ADC). Outline. VCO for 17-GHz receiver Transformer-based topology High-Q resonator

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Low-Phase-Noise 18-GHz Voltage-Controlled Oscillator

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  1. Elettronica delle microonde e delle onde millimetriche – A1 Low-Phase-Noise 18-GHz Voltage-Controlled Oscillator Angelo Scuderi and Giuseppe Palmisano Radio Frequency Advanced Design Center (RF-ADC)

  2. Outline • VCO for 17-GHz receiver • Transformer-based topology • High-Q resonator • Circuit design • Experimental results

  3. VCO for 17-GHz receiver HIPERLINK standard exploits the 17-GHz ISM band and will provide a link between local 5-GHz WLANs and metropolitan networks. A multi-band receiver at 5 and 17 GHz allows high-level of integration but requires a local oscillator with wide tuning capabilities and low-noise performance.

  4. Transformer-based topology Thanks to a transformer the resonator exploits an inductive coupling, consequently, both biasing resistors (RVV and RBB) and coupling capacitors (CVV and CBB) are removed improving phase noise and tuning range, respectively.

  5. High-Q resonator An issue of great concern is the fabrication of high-Q resonator in a low-cost bipolar technology (17 mask steps) supplied by STMicroelectronics.

  6. Circuit design The VCO is composed of a transformer-based core oscillating at 9 GHz followed by a frequency doubler to obtain a working frequency of 18 GHz. The frequency doubler is composed by a full-wave rectifier and a comparator, whose frequency response was increased by using a zero-peaking technique.

  7. Experimental results The VCO exhibits a tuning range of 4.1 GHz from 16.4 to 20.5 GHz, when the control voltage VTUNE sweeps from 0 to 3 V. The measured phase noise is -109 dBc/Hz at 1-MHz offset from a carrier of 18.5 GHz.

  8. See you later …Poster A1

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