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V-band Sub-Harmonic Gate-Pumped Resistive Mixer With a 180 degrees Hybrid Using an In-Phase Power Divider Merging With an Out-Of-Phase Marchand Balun
(2019-01-01)
Chang, Wei Ling
;
Meng, Chinchun
;
Huang, Guo-Wei
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
A high isolation gate-pumped resistive sub-harmonic mixer with a miniature 180 degrees hybrid is demonstrated using 90 nm CMOS process. An in-phase power divider and an out-of-phase Marchand balun form a reduced-size 180 degrees hybrid with shared coupled lines. For a sub-harmonic mixer, the input matches at LO/RF ports of the 180 degrees hybrid are achieved using high/low coupling coefficients of the shared equal-length coupled lines. Moreover, isolations between RF and LO ports are achieved at all frequencies because a Marchand balun maintains balanced signals and a power divider provides in-phase equal magnitude signals at all frequencies. The sub-harmonic mixer achieves a conversion gain around 0-3 dB from 58-67 GHz with 0 dBm LO pumping power. The LO-to-RF isolation is better than 36 dB within the operating bandwidth.
0.35-mu m SiGe BiCMOS Weaver Image Rejection Receiver with 60-GHz Double-Quadrature Sub-harmonic Schottky Diode Mixer and 10-GHz Double Quadrature Gilbert Mixer
(2017-01-01)
Wang, Kuo-An
;
Meng, ChinChun
;
Lo, Tai-Lin
;
Huang, Guo-Wei
;
電機工程學系
A Weaver image rejection receiver using 60-GHz double-quadrature sub-harmonic Schottky diode mixer is demonstrated using 0.35-pm SiGe BiCMOS technology. A miniature RF quadrature generator is realized to generate 60-GHz quadrature RE signals. A Weaver image rejection architecture is applied in this paper to filter out the image signals. A triple-balanced sub-harmonic Schottky diode mixer with a trifilar transformer is adopted to the first down conversion stage to obtain good LO1-RF and 2LO(1)-RE isolations while the down-converted IF1 signals are converted to the base band I/Q signals with a double-quadrature Gilbert mixer at the second down conversion stage. As a result, a 60-GHz Weaver image rejection receiver with a 2-GHz channel bandwidth is achieved with IP1dB of 2 dBm and HP3 of 14 dBm.
60-GHz SiGe BiCMOS Dual-Conversion Down-Converter: Schottky Diode RF Mixer and Analog Gilbert IF Mixer with Microwave Quadrature Generator
(2016)
Kao, Jen-Chieh
;
Meng, Chinchun
;
Wei, Hung-Ju
;
Huang, Guo-Wei
;
電機工程學系
A 60 GHz dual-conversion down-converter using 0.35 mu m SiGe BiCMOS process is demonstrated in this paper. A Schottky diode ring mixer with wideband Marchand balun works as the 60-GHz RF mixer while two analog Gilbert micromixers with LO port pumped by two quadrature couplers work as IF mixers. The cut-off frequency of a Schottky diode makes a fundamental RF ring mixer possible because the series resistance of a Schottky diode is effectively reduced by the n+ buried layer in SiGe BiCMOS process. A Gilbert micromixer with an IF buffer is used to accommodate the single-ended output of the RF ring mixer. By combining these advantages, a dual-conversion down-converter is achieved. The converter has about 8 dB conversion gain, 10 GHz RF bandwidth of 50 - 60 GHz, 100 MHz IF bandwidth when LO1 power is 8 dBm and LO2 power is 2 dBm.
V-Band Dual-Conversion Down-Converter with Schottky-Diode Ring-Mixer Using 0.35 mu m SiGe BiCMOS Process
(2015)
Kao, Jen-Chieh
;
Meng, Chinchun
;
Lo, Tai-Lin
;
Huang, Guo-Wei
;
電機學院
A V-band dual-conversion downconverter using 0.35 mu m SiGe BiCMOS process is demonstrated in this paper. This downconverter contains three sub-circuits, a V-band Schottky-diode RF mixer with Marchand balun, a 15-GHz low-noise IF buffer amplifier, and an IF Gilbert mixer. The Schottky diode has high cutoff frequency because of the n+ buried layer in the SiGe BiCMOS process. Thus, a fundamental ring-mixer is employed as the RF mixer. A Marchand balun has a broadband feature, and the feature has been used to achieve converter for high frequency circuit applications. In addition to this, a low-noise buffer amplifier is used to provide enough gain performance. By combining these advantages, a dual-conversion downconverter is successfully achieved. The downconverter has about 6 dB conversion loss, 18 GHz RF bandwidth, 800 MHz IF bandwidth and about -6 dBm IP1dB when LO1 power is 5 dBm and LO2 power is 8 dBm.
Ka-Band pHEMT Quadrupler with Injection and Extraction from Oscillator Frequency Doubling Points
(2014-01-01)
Chang, Wei-Ling
;
Meng, Chinchun
;
Syu, Jin-Siang
;
Wu, Yan-Feng
;
Huang, Guo-Wei
A Ka-band injection-locked quadrupler MMIC is demonstrated using 0.15-mu m pseudomorphic high electron mobility transistor (pHEMT) technology. pHEMT technology is suitable to the millimeter wave quadrupler by using the topology of high-order sub-harmonic injection lock based on a cross-coupled oscillator. Furthermore, thanks to the semi-insulating GaAs substrate, it is easy to implement microwave/millimeter wave passive components to achieve accurate balanced signals. As a result, the measured output power of the quadrupler is 8 dBm for frequency of 30 GHz and the locking bandwidth reaches 300 MHz.
V-band pHEMT Dual-Conversion Down-Converter With Schottky Diode RF Mixer and Analog Gilbert IF Mixer
(2014-01-01)
Chang, Wei-Ling
;
Meng, Chinchun
;
Chang, Chih-Kai
;
Huang, Guo-Wei
;
電機工程學系
A V-band dual-conversion down-converter with the Schottky-diode first conversion mixer and the analog Gilbert second conversion mixer is demonstrated using 0.15-mu m pseudomorphic high electron mobility transistor (pHEMT) technology. The diode mixer based on quarter-wavelength design methodology occupies a reasonable real estate at millimeter-wave frequency while the analog IF mixer has the size advantage at low microwave frequency. A trifilar transformer is employed in the first mixer to have balanced RF/LO/IF signals for the anti-parallel diode-pairs while a Marchand balance converts the RF signal into the balanced one. Analog I/Q Gilbert mixers driven by the poly-phase filter in the LO port achieve precise I/Q IF output. As a result, this work achieves a wideband conversion gain around -1 dB from 54-64 GHz, -5 dBm of IP1dB, and 6 dBm of IIP3.
Gilbert Mixers With Microwave Quadrature/Differential Generators: An Approach for Millimeter-Wave IC
(2009)
Meng, Chinchun
;
Tseng, Sheng-Che
;
電信工程研究所
;
Institute of Communications Engineering
Several microwave passive components can be integrated with active circuits in standard silicon processes for millimeter-wave applications. Passive components such as Marchand baluns, quadrature couplers, and rat-race hybrids are directly implemented on a standard low-resistivity (similar to 10 Omega xcm) silicon substrate for size compactness because of the high dielectric constant. New circuit design concepts such as balanced path loss and distortionless transmission lines are applied to tolerate the unavoidable loss and to maintain the functionality of components.
SiGe HBT Gilbert downconverter with an integrated miniaturized Marchand balun for UWB applications
(2007)
Tseng, Sheng-Che
;
Meng, Chinchun
;
Chang, Chia-Hung
;
Huang, Guo-Wei
;
電信工程研究所
A 15.5-dB conversion gain 0.35-mu m SiGe HBT Gilbert mixer with the lumped-element Marchand balun for 3.1 GHz to 10.6 GHz UWB applications is implemented using standard silicon processes. This mixer has the 1.5-GHz IF 3-dB bandwidth as well as the 15.8-dB noise figure. The balun size is only 0.25 mm x 0.5 mm. Because of the balanced structure of the Marchand balun, the magnitude imbalance and phase difference of outputs are below 1 dB and about 184 degrees, respectively. In the present of a lossy substrate, the dissipated loss of the balun is still less than 4 dB thanks to the advantage of the lumped-element technique. The total current consumption of the entire mixer is 13.9 mA at 5 V voltage supply while the chip size including probing pads is 1 mm x 0.9 mm.

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