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Author: search.filters.author.Tseng, Sheng-CheSubject: search.filters.subject.Gilbert mixer

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    A 2.4, 5.2, and 5.7 GHz CMFB gilbert downconverter with low-voltage cascode current mirror input stage
    (2006-11-01)
    Tseng, Sheng-Che
    ;
    Meng, Chinchun
    ;
    Huang, Guo-Wei
    ;
    電信工程研究所
    ;
    Institute of Communications Engineering
    A triple-band (2.4, 5.2, and 5.7 GHz) CMFB downconversion micromixer with a low-voltage cascode current mirror RF input stage has been demonstrated by the 0.18-mu m CMOS technology in this letter. Micromixer has a single-ended RF input stage, the CMFB topology is adopted to improve the conversion gain, and a differential-to-single output buffer is used to convert the differential output of the mixer into a single-ended output. The fully integrated downconversion micromixer has the conversion gain of 12 dB, LO-to-IF isolation of 43 dB, LO-to-RF isolation of 48 dB, and RF-to-IF isolation of 18 dB at 2.4 GHz. The mixer has the conversion gain of 7.5 dB, LO-to-IF isolation of 54 dB, LO-to-RF isolation of 49.5 dB, and RF-to-IF isolation of 25 dB at 5.7 GHz. The total quiescent current consumption of the circuit is 7.6 mA. (c) 2006 Wiley Periodicals, Inc.
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    GaInP/GaAs HBT sub-harmonic Gilbert mixers using stacked-LO and leveled-LO topologies
    (2007-05-01)
    Wu, Tzung-Han
    ;
    Tseng, Sheng-Che
    ;
    Meng, Chin-Chun
    ;
    Huang, Guo-Wei
    ;
    電信工程研究所
    This paper discusses and demonstrates the most popular sub-harmonic Gilbert mixers in 2-mu m GaInP/GaAs HBT technology. High two local oscillators (2LO)-to-RF isolation is important to alleviate the self-mixing problem of the sub-harmonic mixer. The demonstrated GaInP/GaAs HBT stacked-local oscillator (LO) mixer topology has achieved the best 2LO-to-RF isolation when compared with the previous literature. On the other hand, the leveled-LO sub-harmonic mixers have advantages in terms of the high speed and low dc supply voltage at the cost of much larger LO pumping power. Among all the structures, the bottom-LO sub-harmonic mixer has the lowest current consumption and the simplest circuit structure at the expense of the 2LO-to-RF isolation.
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    Seven GHz high gain 0.18 mu m CMOS gilbert downconverter with wide-swing cascode current mirrors
    (2008-02-01)
    Tseng, Sheng-Che
    ;
    Meng, Chinchun
    ;
    Huang, Guo-Wei
    ;
    電信工程研究所
    ;
    Institute of Communications Engineering
    A downconversion micromixer with low-voltage cascode current mirrors at both transconductor and load stages has been implemented using the 0.18-mu m CMOS technology in this article. This micromixer has a single-to-differential RF input transconductor formed by the NMOS wide-swing cascade current mirror, while the PMOS wide-swing cascode current mirror is also employed to improve conversion gain. A super source follower is used at the output to reduce the output impedance and to transfer more power to the load. This fully integrated downconverter has the high conversion gain of 16 dB and high LO-to-IF isolation of 50 dB at 7 GHz. The current consumption of the mixer core is 1 mA at 1.8 V supply voltage. Thanks to the low-voltage operation property of the wide-swing cascode current mirror, six transistors can be stacked within 1.8 V supply voltage. (c) 2007 Wiley Periodicals, Inc.