IU-Journal of Electrical & Electronics Engineering, Apr 27, 2016
In this work, a new SiGe mixer circuit topology operating with the second harmonically pumped mix... more In this work, a new SiGe mixer circuit topology operating with the second harmonically pumped mixing technique is proposed. The proposed circuit is developed for to be used in IC receivers which use Zero-IF mixers at their front ends. The Analysis of the circuit is performed and the appropriate operation conditions for second harmonically pumped mixing are investigated. The topology is quite suitable for the wide band applications and has a unique mechanism to prevent the LO to RF leakage which results in DC offset at the output. Simulations are performed and according to the simulation results, 21dB of conversion voltage gain is obtained within 2-12 GHz RF range while the DC voltage component at the output stays more than 80dB below the IF component.
In this work, a high power high efficiency and high gain class-F power amplifier with low harmoni... more In this work, a high power high efficiency and high gain class-F power amplifier with low harmonic content was designed and simulated by using CGH40010F and CGHV40050F Gallium Nitride transistors and NI AWR Microwave Office for electromedical and radar applications. According to the simulation results, 47.5 dBm output power, 73% efficiency and 22 dB gain values were obtained in the 2.7-2.9 frequency band.
This paper investigates the relay effects on band-width efficiency. The investigation considers t... more This paper investigates the relay effects on band-width efficiency. The investigation considers that the relay terminals are serially placed between the transmitter and the receiver terminals. The investigation considers that the transmitter terminal possesses the channel state information and also considers log-normal fading channel for the performance analysis. Based on the channel conditions, the transmitter adjusts the modulation sizes in each slot by using the channel state information. During the adaptive transmission, the peak power constraint is addressed to provide eye safety. Results show that the proposed adaptive modulation system significantly enhances bandwidth efficiency in comparison to the non-adaptive system.
2016 National Conference on Electrical, Electronics and Biomedical Engineering (ELECO), Dec 1, 2016
Multiband filter design problem includes both analytical and implementation aspects. The main int... more Multiband filter design problem includes both analytical and implementation aspects. The main interest is defining a Transducer Power Gain (TPG) function characteristic over frequency bands. It is demanded to suppress or amplify the TPG at certain frequencies. In this study a new method is presented for creating the multiband response with using well defined analytical approach. A transformer-less bandpass filter prototype is synthesized with using well known Simplified Real Frequency Technique (SRFT) and multiband characteristic is derived with applying a basic frequency transformation on the bandpass prototype filter. A double band filter design example is prensented. Descriptive functions of each sections are given in scattering polynomail form. Certain advantages are provided with using this method besides the sequential application of basic low pass to band pass transfromation on a low pass transfer function such as low counts of elements, controlling the filter roll off, easy conversion to distributed domain without probable parasitic couplings.
This work describes a real frequency design approach for dual-band matching networks. The propose... more This work describes a real frequency design approach for dual-band matching networks. The proposed design technique employs a direct low-pass to dual pass band frequency transformation in the scattering based real frequency design of transformer free double band matching filters. For prescribed matching pass-bands, the parameters of dual-band frequency transformation are also iterated to enhance the matching band control in the nonlinear optimization process. A dual band matching network design example is presented to illustrate the application of the design approach.
In this study, the realization problem of matching network consisting of Brune sections is invest... more In this study, the realization problem of matching network consisting of Brune sections is investigated. In the synthesis of a general impedance function with finite transmission zeros, each transmission zero extraction results in a Brune section involving a negative reactive element. Although coupled inductances can be used to remove negative elements, a direct mutual coupling free ladder design is aimed by properly incorporating the mid-shunt ladder realizability conditions of Fujisawa. For this purpose, impedance based Real Frequency Technique (RFT) is used to construct realizable impedance function and Fujisawa synthesis procedure is applied for mid-shunt ladder realization. An illustrative matching network design example is presented.
In this study, a new method of design for dual band matching network is presented. A transformer-... more In this study, a new method of design for dual band matching network is presented. A transformer-less Band Pass (BP) prototype matching network is synthesized with well-known Simplified Real Frequency Technique (SRFT) via cascaded combination of Low Pass (LP) and High Pass (HP) sections and optimized under LP to BP frequency transformation to create dual band response. Scattering parameters based descriptive functions of transformer-less BP prototype network is obtained. Dual band response is derived via frequency mapping on the produced BP prototype network. The new method combines several advantages both in design and realization step. The application of this method is discussed with sequential transformation based approach. A dual band matching network design for a PIFA antenna is presented. By using this method dual band characteristic is derived with only one step application of frequency mapping which let use to have more practical realizations.
IU-Journal of Electrical & Electronics Engineering, Apr 27, 2016
In this work, a new SiGe mixer circuit topology operating with the second harmonically pumped mix... more In this work, a new SiGe mixer circuit topology operating with the second harmonically pumped mixing technique is proposed. The proposed circuit is developed for to be used in IC receivers which use Zero-IF mixers at their front ends. The Analysis of the circuit is performed and the appropriate operation conditions for second harmonically pumped mixing are investigated. The topology is quite suitable for the wide band applications and has a unique mechanism to prevent the LO to RF leakage which results in DC offset at the output. Simulations are performed and according to the simulation results, 21dB of conversion voltage gain is obtained within 2-12 GHz RF range while the DC voltage component at the output stays more than 80dB below the IF component.
In this work, a high power high efficiency and high gain class-F power amplifier with low harmoni... more In this work, a high power high efficiency and high gain class-F power amplifier with low harmonic content was designed and simulated by using CGH40010F and CGHV40050F Gallium Nitride transistors and NI AWR Microwave Office for electromedical and radar applications. According to the simulation results, 47.5 dBm output power, 73% efficiency and 22 dB gain values were obtained in the 2.7-2.9 frequency band.
This paper investigates the relay effects on band-width efficiency. The investigation considers t... more This paper investigates the relay effects on band-width efficiency. The investigation considers that the relay terminals are serially placed between the transmitter and the receiver terminals. The investigation considers that the transmitter terminal possesses the channel state information and also considers log-normal fading channel for the performance analysis. Based on the channel conditions, the transmitter adjusts the modulation sizes in each slot by using the channel state information. During the adaptive transmission, the peak power constraint is addressed to provide eye safety. Results show that the proposed adaptive modulation system significantly enhances bandwidth efficiency in comparison to the non-adaptive system.
2016 National Conference on Electrical, Electronics and Biomedical Engineering (ELECO), Dec 1, 2016
Multiband filter design problem includes both analytical and implementation aspects. The main int... more Multiband filter design problem includes both analytical and implementation aspects. The main interest is defining a Transducer Power Gain (TPG) function characteristic over frequency bands. It is demanded to suppress or amplify the TPG at certain frequencies. In this study a new method is presented for creating the multiband response with using well defined analytical approach. A transformer-less bandpass filter prototype is synthesized with using well known Simplified Real Frequency Technique (SRFT) and multiband characteristic is derived with applying a basic frequency transformation on the bandpass prototype filter. A double band filter design example is prensented. Descriptive functions of each sections are given in scattering polynomail form. Certain advantages are provided with using this method besides the sequential application of basic low pass to band pass transfromation on a low pass transfer function such as low counts of elements, controlling the filter roll off, easy conversion to distributed domain without probable parasitic couplings.
This work describes a real frequency design approach for dual-band matching networks. The propose... more This work describes a real frequency design approach for dual-band matching networks. The proposed design technique employs a direct low-pass to dual pass band frequency transformation in the scattering based real frequency design of transformer free double band matching filters. For prescribed matching pass-bands, the parameters of dual-band frequency transformation are also iterated to enhance the matching band control in the nonlinear optimization process. A dual band matching network design example is presented to illustrate the application of the design approach.
In this study, the realization problem of matching network consisting of Brune sections is invest... more In this study, the realization problem of matching network consisting of Brune sections is investigated. In the synthesis of a general impedance function with finite transmission zeros, each transmission zero extraction results in a Brune section involving a negative reactive element. Although coupled inductances can be used to remove negative elements, a direct mutual coupling free ladder design is aimed by properly incorporating the mid-shunt ladder realizability conditions of Fujisawa. For this purpose, impedance based Real Frequency Technique (RFT) is used to construct realizable impedance function and Fujisawa synthesis procedure is applied for mid-shunt ladder realization. An illustrative matching network design example is presented.
In this study, a new method of design for dual band matching network is presented. A transformer-... more In this study, a new method of design for dual band matching network is presented. A transformer-less Band Pass (BP) prototype matching network is synthesized with well-known Simplified Real Frequency Technique (SRFT) via cascaded combination of Low Pass (LP) and High Pass (HP) sections and optimized under LP to BP frequency transformation to create dual band response. Scattering parameters based descriptive functions of transformer-less BP prototype network is obtained. Dual band response is derived via frequency mapping on the produced BP prototype network. The new method combines several advantages both in design and realization step. The application of this method is discussed with sequential transformation based approach. A dual band matching network design for a PIFA antenna is presented. By using this method dual band characteristic is derived with only one step application of frequency mapping which let use to have more practical realizations.
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Papers by Siddik B Yarman