• Title/Summary/Keyword: Voltage-controlled frequency tuning

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Design and Implementation of the new structural VCO with improved tuning range (Tuning range 개선을 위한 새로운 구조의 VCO 설계 및 제작)

  • Kang, Dong-Jin;Kim, Dong-Ok
    • 한국정보통신설비학회:학술대회논문집
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    • 2009.08a
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    • pp.293-297
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    • 2009
  • In this thesis, design of a VCO(Voltage controlled Oscillator) with a novel tuning mechanism is presented for the Radar system. This circuit, the 9.5 GHz oscillator is designed and implemented by restructuring microstrip resonator to raise Q value and to require a wide frequency tuning range. This product is fabricated on 2.6 Teflon substrate and device is NE722S01. In this paper, The new microstrip resonator VCO is proposed to achieve the characteristic of a wide frequency tuning range. This microstrip resonator VCO shows the phase noise characteristic of -108.3 dBc/Hz at 1 MHz offset from the fundamental frequency, the output power of 5.7 dBm and the second harmonic suppression of -38 dBc for the VCO are obtained. The manufacture VCO shows a frequency tuning range of 193.8 MHz. The proposed micro trip resonator VCO can be used for X-band Radar System with required tuning range.

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A 2.4GHz Back-gate Tuned VCO with Digital/Analog Tuning Inputs (디지털/아날로그 입력을 통한 백게이트 튜닝 2.4 GHz VCO 설계)

  • Oh, Beom-Seok;Lee, Dae-Hee;Jung, Wung
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2003.11a
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    • pp.234-238
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    • 2003
  • In this work, we have designed a fully integrated 2.4GHz LC-tuned voltage-controlled oscillator (VCO) with multiple tuning inputs for a $0.25-{\mu}m$ standard CMOS Process. The design of voltage-controlled oscillator is based on an LC-resonator with a spiral inductor of octagonal type and pMOS-varactors. Only two metal layer have been used in the designed inductor. The frequency tuning is achieved by using parallel pMOS transistors as varactors and back-gate tuned pMOS transistors in an active region. Coarse tuning is achieved by using 3-bit pMOS-varactors and fine tuning is performed by using back-gate tuned pMOS transistors in the active region. When 3-bit digital and analog inputs are applied to the designed circuits, voltage-controlled oscillator shows the tuning feature of frequency range between 2.3 GHz and 2.64 GHz. At the power supply voltage of 2.5 V, phase noise is -128dBc/Hz at 3MHz offset from the carrier, Total power dissipation is 7.5 mW.

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Push-Push Voltage Controlled Dielectric Resonator Oscillator Using a Broadside Coupler

  • Ryu, Keun-Kwan;Kim, Sung-Chan
    • Journal of information and communication convergence engineering
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    • v.13 no.2
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    • pp.139-143
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    • 2015
  • A push-push voltage controlled dielectric resonator oscillator (VCDRO) with a modified frequency tuning structure using broadside couplers is investigated. The push-push VCDRO designed at 16 GHz is manufactured using a low temperature co-fired ceramic (LTCC) technology to reduce the circuit size. The frequency tuning structure using a broadside coupler is embedded in a layer of the A6 substrate by using the LTCC process. Experimental results show that the fundamental and third harmonics are suppressed above 15 dBc and 30 dBc, respectively, and the phase noise of push-push VCDRO is -97.5 dBc/Hz at an offset frequency of 100 kHz from the carrier. The proposed frequency tuning structure has a tuning range of 4.46 MHz over a control voltage of 1-11 V. This push-push VCDRO has a miniature size of 15 mm×15 mm. The proposed design and fabrication techniques for a push-push oscillator seem to be applicable in many space and commercial VCDRO products.

A 2.4 ㎓ Back-gate Tuned VCO with Digital/Analog Tuning Inputs (디지털/아날로그 입력을 통해 백게이트 튜닝을 이용한 2.4 ㎓ 전압 제어 발진기의 설계)

  • Oh, Beom-Seok;Hwang, Young-Seung;Chae, Yong-Doo;Lee, Dae-Hee;Jung, Wung
    • Proceedings of the IEEK Conference
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    • 2003.11c
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    • pp.32-36
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    • 2003
  • In this work, we have designed a fully integrated 2.4GHz LC-tuned voltage-controlled oscillator (VCO) with multiple tuning inputs for a 0.25-$\mu\textrm{m}$ standard CMOS process. The design of voltage-controlled oscillator is based on an LC-resonator with a spiral inductor of octagonal type and pMOS-varactors. Only two metal layer have been used in the designed inductor. The frequency tuning is achieved by using parallel pMOS transistors as varactors and back-gate tuned pMOS transistors in an active region. Coarse tuning is achieved by using 3-bit pMOS-varactors and fine tuning is performed by using back-gate tuned pMOS transistors in the active region. When 3-bit digital and analog inputs are applied to the designed circuits, voltage-controlled oscillator shows the tuning feature of frequency range between 2.3 GHz and 2.64 GHz. At the power supply voltage of 2.5 V, phase noise is -128dBc/Hz at 3MHz offset from the carrier. Total power dissipation is 7.5 mW.

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Design of Voltage Controlled Oscillator using Miller Effect

  • Choi Moon-Ho;Kim Yeong-Seuk
    • Proceedings of the IEEK Conference
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    • summer
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    • pp.218-220
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    • 2004
  • A new wide-band VCO topology using Miller capacitance is proposed. Contrary to conventional VCO using the Miller capacitance where the variable amplifier gain is negative, the proposed VCO uses both the negative and positive variable amplifier gain to enhance the frequency tuning range significantly. The proposed VCO is simulated using HSPICE. The simulations show that 410MHz and 220MHz frequency tuning range are obtained using the negative .and positive variable amplifier gain, respectively. The tuning range of the proposed VCO is $23\%$ of the center frequency(2.8GHz). The phase noise is -104dBc/Hz at 1MHz offset by simple model. The operating current is only 3.84mA at 2.5V power supply.

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A Design Method of the 94GHz(W-Band) Waveguide Harmonic Voltage Controlled Oscillator for the Armor Sensor (장갑표적 감지센서용 94GHz 도파관 하모닉 전압조정발진기 설계 기법)

  • Roh, Jin-Eep;Choi, Jae-Hyun;Li, Jun-Wen;Ahn, Bierng-Chearl
    • Journal of the Korea Institute of Military Science and Technology
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    • v.8 no.3 s.22
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    • pp.64-72
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    • 2005
  • In this paper, we propose a design method of the millimeter-wave(W-Band) waveguide cavity harmonic voltage controlled oscillator(VCO) using a Gunn diode for the armor sensor. Using the 3-dimensional simulation tool(Ansoft $HFSS^{TM}$), we were able to find the impedance matching point between waveguide and Gunn diode and estimate the oscillation frequency. A varactor diode is used for the frequency tuning, and we find out the equation for the calculation of the tunable frequency range. The designed VCO shows good performances; 17dBm output power at 94GHz center frequency, 520MHz frequency tuning range similar to the estimated value(480MHz).

Design and fabrication of the 2.4 to 2.5 GHz voltage controlled oscillator using microstrip patch antenna (마이크로스트립 패치 안테나를 이용한 2.4 ~ 2.5GHz 에서 동작하는 전압 조정 발진기의 설계 및 제작)

  • 황재호;명노훈
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.33A no.2
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    • pp.78-86
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    • 1996
  • Solid-state devices can be directly integrated with a planar antenna to form active antenna elements. In this paper, the voltage controlled oscillator (VCO) is designed and fabricated at 2.4 to 2.5 GHz using a microstrip patch antenna. A varactor diode is used as avariable reactance. The predicted frequency tuning range of the VCO is 2.448 to 2.498 GHz in the design procedure and the fabricated VCO has 2.446 to 2.498 GHz frequency tuning range when the varactor tuning voltage is varied from 0 to 11V. Transmitted power output of the patch antenna which serves both as a rsonator and a radiating element for VCO is about 18 mW over this tuning range.

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Improvement of Phase Noise Characteristics for Tuning Voltage in Voltage Controlled Oscillator using Coupled Microstrip Lines (결합 마이크로스트립 라인을 이용한 전압제어 발진기의 동조전압에 따른 위상잡음 특성 개선)

  • Ryu, Keun-Kwan;Shin, Dong-Hwan;Yom, In-Bok;Kim, Sung-Chan
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.35 no.5A
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    • pp.513-518
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    • 2010
  • Improvement of phase noise characteristics in a different approach of HEMT VCO (Voltage Controlled Oscillator) with coupled microstrip lines to tune the oscillating frequency is investigated. Two HEMT VCOs of 9.8GHz are manufactured in the same configuration except for the frequency tuning circuit in order to empirically demonstrate the phase noise reduction. Experimental result shows that phase noise reduction can be enhanced 8dBc/Hz at 100KHz offset frequency from carrier by frequency tuning circuit with coupled microstrip lines over the conventional VCO.

A Design of Push-push Voltage Controlled Oscillator using Frequency Tuning Circuit with Single Transmission Line (단일 전송선로의 주파수 동조회로를 이용한 push-push 전압제어 발진기의 설계 및 제작)

  • Ryu, Keun-Kwan;Kim, Sung-Chan
    • Journal of IKEEE
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    • v.16 no.2
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    • pp.121-126
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    • 2012
  • In this paper, a push-push VCDRO (Voltage Controlled Dielectric Resonator Oscillator) with a modified frequency tuning structure is investigated. The push-push VCDRO designed at 16GHz is manufactured using a LTCC (Low Temperature Co-fired Ceramic) technology to reduce the circuit size. The frequency tuning structure is embedded in intermediate layer of A6 substrate by an advantage of LTCC process. Experimental results show that the fundamental frequency suppression is above 30dBc, the frequency tuning range is 0.43MHz over control voltage of 0 to 12V, and phase noise of push-push VCDRO presents a good performance of -103dBc/Hz at 100KHz offset frequency from carrier.

Integrated Filter Circuits Design for Mobile Communications (무선 이동통신 단말에 응용 가능한 집적 필터회로 설계)

  • Lee, Kwang
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.38A no.12
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    • pp.991-997
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    • 2013
  • A new frequency tuning scheme and a transconductor with a wide tuning range and low harmonic distortion is presented. This frequency tuning technique is based on the relationship between the time-constant and the elapsed times in charging a capacitor up to a certain level. Its structure is as simple as that of a conventional tuning scheme using a VCF(Voltage-Controlled Filter) and it does not need a pure sine wave but uses a CLK(Clock) pulse as a reference signal, which is easily obtained from on-chip system clocks or external X-tal oscillators. When a certain reference CLK is given, without complex capacitor arrays the pole frequency of the filter can be controlled continuously in the frequency domain. Simulation results are presented to confirm the operation of the proposed approach.