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1887

access icon free K-band frequency-selective limiter using an injection locked oscillator for blocker cancellation

© The Institution of Engineering and Technology
Received 06/09/2017, Published 19/02/2018

A frequency-selective limiter (FSL) using an injection locked oscillator (ILO) is proposed for a blocker cancellation, which employs an ILO in the feedforward path as a high-Q notch filter to select and amplify the blocker from the input signal. The ILO also functions as a phase shifter providing a proper phase delay so that two blockers in the feedforward and thru paths cancel each other out in the combining node. The proposed FSL is fabricated in a commercial 0.15 μm GaAs pHEMT process with a maximum blocker suppression of 27 dB in the 50 MHz spacing two-tone measurement at the K-band. Thus, it provides a blocker suppression higher than 20 dB over the 250 MHz blocker bandwidth.

Inspec keywords: notch filters; injection locked oscillators; III-V semiconductors; gallium arsenide; phase shifters

Other keywords: bandwidth 250 MHz; blocker amplification; maximum blocker suppression; K-band frequency-selective limiter; K-band; phase delay; two-tone measurement; ILO; gallium arsenide pHEMT process; injection locked oscillator; feedforward path; size 0.15 mum; blocker cancellation; FSL; high-Q notch filter; GaAs; phase shifter; blocker bandwidth

Subjects: Other analogue circuits; Oscillators; Filters and other networks

References

    1. 1)
      • 1. Wu, C.H., Tsai, W.C., Tan, C.G., et al: ‘A GPS/Galileo SoC with adaptive in-band blocker cancellation in 65 nm CMOS’. IEEE Int. Solid-State Circuits Conf., San Francisco, USA, February 2011, pp. 462–464.
    2. 2)
      • 2. Pourbagheri, S., Mayaram, K., Fizz, T.S.: ‘A self-clocked blocker-filtering technique for SAW-less wireless applications’. IEEE Radio Frequency Integrated Circuits (RFIC) Symp., San Francisco, USA, May 2016, pp. 250–253.
    3. 3)
      • 5. Tseng, W.J., Tsai, Z.M., Lin, C.S., et al: ‘Ku-band phase shifter based on injection locked voltage oscillator’. IEEE Int. Conf. Wireless Information Technology and Systems, Honolulu, USA, September 2010, pp. 1–4.
    4. 4)
      • 3. Golubicic, Z.: ‘Injection locked DRO synchronized by multitone signal’. 19th European Microwave Conf., London, UK, September 1989, pp. 395–400.
    5. 5)
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2017.3396
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