本論文為探討應用於24 GHz與2.4 GHz 雙頻共存接收機之子電路設計，其中可依操作頻率分為兩個部分：第一部分為24-28 GHz之雙平衡式吉伯特細胞混頻器與24 GHz接收機前端電路；第二部分為2.4 GHz電流再利用式壓控振盪器。所設計之電路皆使用TSMC 0.18 m 製程模擬與實現。
24-28 GHz雙平衡式吉伯特細混頻器輸入射頻訊號頻率為24-28 GHz，透過本地振盪源將射頻訊號降頻至2.4 GHz頻帶，以傳遞置後端2.4 GHz系統使用。此子電路使用inductive peaking技術，在轉導級與切換級之間插入電感，拓展頻寬，達到高頻操作之目的。根據量測結果，於操作頻帶之間轉換增益皆大於4.3 dB，並且P1dB達到-13 dBm，IIP3為-6 dBm，消耗的功率為18.9 mW。
24 GHz接收機前端電路使用三級低雜訊放大器串接，提升整體增益並且降低雜訊指數，提高整體接收機之靈敏度，第三級之低雜訊放大器並對線性度做最佳化，改善線性度。混頻器使用單平衡式吉伯特細胞混頻器，達到低功耗之設計目標。根據量測結果，整體轉換增益達到10.5 dB；雜訊指數11.8 dB；P1dB為-25 dBm；IIP3達到-19 dBm，整體消耗功率為32.5 mW。
2.4 GHz壓控振盪器使用電流再利用式架構之特性，達到低功耗之設計目標，並且改善輸出擺幅不平衡之現象。根據量測結果，壓控振盪器核心消耗功率為1.8 mW，可調頻率範圍為2.27-2.79 GHz，達到20.5%可調範圍，相位雜訊在2.4 GHz偏移1 MHz處為-118 dBc/Hz，可調頻率範圍內之輸出功率皆大於-7.3 dBm。

This thesis presents the subcircuit design of the 2.4/24 GHz dual-band coexistence sensor receiver RF front-end, which can be divided into two topics by the operation frequency. The first topic is the design of 24-28 GHz double-balanced Gilbert-cell mixer and 24 GHz front-end. The second topic is the design of 2.4 GHz current-reused voltage-controlled oscillator. The circuits in this thesis are simulated and implemented in TSMC 0.18 m process.
The proposed 24-28 GHz double-balanced Gilbert-cell mixer applies a 24-28 GHz RF input signal, which is downconverted by a LO signal to 2.4 GHz band and delivers to the subsequent 2.4 GHz system. This circuit adopts inductive peaking technique, inserting an inductor between the transconductance and switch stage, to extend the bandwidth and improve the performance of high frequency operation. The proposed mixer provides a conversion gain in the desired band greater than 4.3 dB with the P1dB and IIP3 of -13 and -6 dBm, while drawing the 18.9 mW from a 1.8 V supply.
The proposed 24 GHz front-end utilizes the three-stage low-noise amplifier to enhance the overall gain, diminish the noise figure and improve the sensitivity of the front-end. The mixer in the proposed front-end employs a single-balanced mixer to lower power consumption. The proposed front-end achieves a conversion gain of 10.5 dB with the noise figure of 11.8 dB and provides a P1dB and IIP3 of -25 and -19 dBm, while taking the 32.5 mW from a 1.8 V supply.
The proposed 2.4 GHz current-reused voltage-controlled oscillator takes advantage of its topology and improves the unbalanced voltage swing, exhibiting an extreme low power consumption and a low unbalance ratio. The proposed voltage-controlled oscillator achieves -118 dBc/Hz at 1 MHz offset with a tuning range of 2.27-2.79 GHz (20%), drawing only 1.8mW from a 1.5 V supply; furthermore, the output power is greater than -7.3 dBm in the desired band.

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