TY - JOUR
T1 - 35-65-GHz CMOS broadband modulator and demodulator with sub-harmonic pumping for MMW wireless gigabit applications
AU - Tsai, Jeng Han
AU - Huang, Tian Wei
N1 - Funding Information:
Manuscript received February 24, 2007; revised May 29, 2007. This work was supported by the National Science Council of Taiwan under Grant NSC 96-2219-E-002-021, Grant NSC 95-2219-E-002-011, Grant NSC 95-2221-E-002-084-MY2, and Grant NSC 93-2752-E-002-003-PAE.
PY - 2007/10
Y1 - 2007/10
N2 - Sub-harmonic modulator and demodulator are presented in this paper using 0.13-μm standard CMOS technology for millimeter-wave (MMW) wireless gigabit direct-conversion systems. To overcome the main problem of local oscillator (LO) leakage in direct-conversion systems, the sub-harmonically pumped scheme is selected in this mixer design. An embedded four-way quadrature divider is utilized in the sub-harmonic Gilbert-cell design to generate quadrature-phases LO signals at MMW frequency. For broadband applications, a broadband matching design formula is provided in this paper to extend the operational frequency range from 35 to 65 GHz. To improve the flatness of conversion loss at high frequency, high-impedance compensation lines are incorporated between the transconductance stage and LO switching quad of the Gilbert-cell mixer to compensate the parasitic capacitance. The sub-harmonic modulator and demodulator exhibit 6 ± 1.5 dB and 7.5 ± 1.5 dB measured conversion loss, respectively, from 35 to 65 GHz. For MMW wireless gigabit applications, the gigabit modulation signal test is successfully performed through the direct-conversion system in this paper. To our knowledge, this is the first demonstration of the MMW CMOS sub-harmonic modulator and demodulator that feature broadband and gigabit applications.
AB - Sub-harmonic modulator and demodulator are presented in this paper using 0.13-μm standard CMOS technology for millimeter-wave (MMW) wireless gigabit direct-conversion systems. To overcome the main problem of local oscillator (LO) leakage in direct-conversion systems, the sub-harmonically pumped scheme is selected in this mixer design. An embedded four-way quadrature divider is utilized in the sub-harmonic Gilbert-cell design to generate quadrature-phases LO signals at MMW frequency. For broadband applications, a broadband matching design formula is provided in this paper to extend the operational frequency range from 35 to 65 GHz. To improve the flatness of conversion loss at high frequency, high-impedance compensation lines are incorporated between the transconductance stage and LO switching quad of the Gilbert-cell mixer to compensate the parasitic capacitance. The sub-harmonic modulator and demodulator exhibit 6 ± 1.5 dB and 7.5 ± 1.5 dB measured conversion loss, respectively, from 35 to 65 GHz. For MMW wireless gigabit applications, the gigabit modulation signal test is successfully performed through the direct-conversion system in this paper. To our knowledge, this is the first demonstration of the MMW CMOS sub-harmonic modulator and demodulator that feature broadband and gigabit applications.
KW - CMOS
KW - Demodulator
KW - Direct conversion
KW - Millimeter wave (MMW)
KW - Modulator
KW - Sub-harmonically pumped
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U2 - 10.1109/TMTT.2007.905497
DO - 10.1109/TMTT.2007.905497
M3 - Article
AN - SCOPUS:35348828771
SN - 0018-9480
VL - 55
SP - 2075
EP - 2084
JO - IEEE Transactions on Microwave Theory and Techniques
JF - IEEE Transactions on Microwave Theory and Techniques
IS - 10
ER -