H. Mizutani

Publications (2)0 Total impact

• Conference Proceeding: A millimeter-wave reflection-type dual-frequency VCO MMIC with a coupled line

  H. Mizutani, K. Nishida, M. Tsuru, K. Kawakami, M. Hieda, E. Taniguchi, M. Shimozawa, Y. Hirano
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  ABSTRACT: This paper presents a millimeter-wave dual-frequency voltage controlled oscillator (VCO), which enables to provide the fundamental and the second harmonic signals from its different ports without frequency multiplier and power divider. In order to provide the fundamental signals, a coupled line is applied instead of a transmission line between the transistor and the resonator in the conventional reflection-type second harmonic VCO. A coupling factor of the coupled line is the design parameter to decide the fundamental and the second harmonic output power, and phase noise. The fabricated 36 and 72 GHz-band dual-frequency VCO MMIC employing InGaP/GaAs HBT process exhibits the output power of -2.9 to -1.0 dBm at 36 GHz-band, and -10.6 to -10.0 dBm at 72 GHz-band, and the phase noise of -108 dBc/Hz at 1 MHz offset from the carrier at 36 GHz-band.
  Microwave Symposium Digest (MTT), 2010 IEEE MTT-S International; 06/2010
• Conference Proceeding: A Millimeter-Wave Highly Linear VCO MMIC with Compact Tuning Voltage Converter

  H. Mizutani, M. Tsuru, T. Matsuzuka, K. Choumei, K. Kawakami, M. Miyazaki
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  ABSTRACT: This paper presents a fully integrated highly linear and low phase noise voltage controlled oscillator (VCO) with a novel compact tuning voltage converter for millimeter-wave applications. The tuning voltage converter consists of only a few diodes and resistors and has nonlinear characteristics to correct varactor tuning curves. The authors fabricated the millimeter-wave VCO MMIC employing InGaP/GaAs HBT process. The MMIC chip size is 2.55 mm times 1.4 mm, in contrast the voltage converter has the size of 0.35 mm times 0.70 mm. The measured tuning sensitivity of 97 plusmn12 MHz/V is achieved for voltages between 0 V and 5 V, and the temperature dependency is very small. Also the phase noise performance is -110.7 dBc/Hz at 1MHz offset from the carrier when the oscillation frequency is 38.2 GHz. This linearization technique can greatly reduce the configuration of the conventional software linearization system
  European Microwave Integrated Circuits Conference, 2006. The 1st; 10/2006