Industrial Technology Research Institute

June-Ming Hsu

Tzu-Yi Yang

Ming-Ching Kuo

Huan-Ke Chiu

Shin-Fu Chen

Tz-Heng Fu

The present invention relates to a signal modulation loop for the multi-mode mobile communication. The adaptive up-conversion modulation loop is applied in the multi-mode mobile communication, and is used for signal integration for the communication system comprising the second generation communication system, the global system for mobile communication (GSM), and the third generation communication system, the wideband code division multiple access (WCDMA), so as to achieve the object of multi-mode communication by using a single modulation loop.

Up-conversion modulation loop for multi-mode mobile communication

A multi-band low noise amplifier comprising: a plurality of matching networks, a plurality of differential pairs, a pair of common base transistors, a pair of inductors, a pair of variable capacitors, a pair of inductors and a current generator. Bases of said plurality of differential pairs are coupled to outputs of said plurality of input matching networks. Emitters and collectors of said plurality of differential pairs are connected. Emitters of said common base transistor pairs are coupled to collectors of said plurality of differential pairs. The inductors are coupled to collectors of said common base transistor and a power supply. The capacitors and the inductors form a resonator pair. The inductors are coupled to emitters of said plurality of differential pairs. The inductor pairs are interlinked. The current generators are coupled to a coupling point of said inductors and to ground.

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Hsinchu, Taiwan

June-Ming Hsu