United Microelectronics Corp.

National Taiwan University

Hsiao-Chin Chen

Chia-Jung Hsu

Shey-Shi Lu

Jen-Chung Chang

Yu-Yee Liow

Tzu-Chao Lin

A frequency-converting circuit and a down converter with the frequency-converting circuit are disclosed. The above-mentioned frequency-converting circuit is used for converting an RF signal into a first baseband signal according to a poly-phase LO signal. The frequency-converting circuit includes a coupler, a first transduction unit and a first switching unit. The coupler is for receiving and splitting the RF signal and delivering a first RF signal via the first output terminal thereof. The first transduction unit is for amplifying the first RF signal. The first switching unit is for performing switching operations on the output signal of the first transduction unit and producing the first baseband signal.

Frequency-converting circuit and down converter with the same

A sub-harmonic mixer and a down converter with the sub-harmonic mixer are provided. The sub-harmonic mixer includes a differential amplifying unit, a current buffer unit, and a switching unit. The differential amplifying unit is used to amplify a radio frequency (RF) signal and employs a first resonance circuit to force a leakage signal to flow to a first voltage. The current buffer unit is used to amplify the gain of an output signal of the differential amplifying unit and employs a second resonance circuit to force the leakage signal to flow to a second voltage. Finally, the switching unit switches an output signal of the current buffer unit into a base band signal.

Sub-harmonic mixer and down converter with the same

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Hsinchu, Taiwan

Hsiao-Chin Chen