Design of the Compensated Marchand Baluns and Its Applications in Millimeter-Wave Frequency Doublers
| Autor: | Ping-Han Tsai, 蔡秉翰 |
|---|---|
| Rok vydání: | 2012 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 100 This thesis consists of the design of the novel compensated Marchand balun and its applications in millimeter-wave frequency doublers. Using this compensated method, we can reduce the imperfect balance performance due to the unequal odd- and even-mode phase velocities of the coupled lines. A compensation line is used in the compensated Marchand balun to improve balanced performance. The design flow and method are presented in detail. Once the parameters of coupled lines are extracted by full-wave simulations, the physical dimensions of the compensation line can be obtained to remove common-mode signals at balanced ports. Three single-balanced doublers using the compensated Marchand baluns are presented. A 15-36 GHz doubler is realized by TSMC 0.18-μm CMOS technology. This doubler with the compensated Marchand balun achieves the conversion gain of -10.2 ~ -13.2 dB with the 3-dB bandwidth of 81% and the fundamental rejection of 33 dB. This doubler indeed verifies the compensated techniques. Two D-band doublers are implemented in TSMC 65-nm CMOS technology. One doubler (Doubler A) without input matching aims for the widest bandwidth performance and achieves the conversion gain of -9.7 ~ -12.3 dB over output frequency of 75-150 GHz. The other doubler (Doubler B) with input matching aims at high-conversion-gain/wide-bandwidth design and achieves the conversion gain of -7.9 ~ -11.3 dB over output frequency of 95-150 GHz. Due to the input matching, the conversion gain of the doubler A is lower than that of the doubler B, but the bandwidth of the doubler A is wider. To the author’s knowledge, the bandwidth of the doubler A is the widest in this frequency regime. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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