Mstar Semiconductor, Inc.

Fu-Cheng Wang

Shuo-Yuan Hsiao

Yao-Chi Wang

Chao-Tung Yang

Sheng-Che Tseng

Yuan-Yu Fu

Shoufang Chen

A direct-conversion transmitter including an oscillator, a frequency divider, a transmitter, and a filter is provided. The oscillator generates an oscillating signal with an original frequency. The frequency divider performs frequency dividing on the oscillating signal, so as to generate a carrier signal. The transmitter receives the carrier signal from the frequency divider and generates an output signal based on the carrier signal and a data signal. The filter is coupled between the frequency divider and the transmitter. The filter filters out an interference signal fed-back from the transmitter to the oscillator, wherein the interference signal may cause the oscillating signal to float.

Direct conversion transmitter and communication system utilizing the same

A signal processing apparatus for a multi-mode satellite positioning system includes a band-pass filter, a local oscillator circuit, a first mixing circuit, a second mixing circuit, an analog-to-digital converter and a baseband circuit. By properly allocating a local frequency, radio frequency (RF) signals of a Global Positioning System (GPS), a Galileo positioning system and a Global Navigation System (GLONASS) are processed via a single signal path to save hardware cost.

Signal processing apparatus for multi-mode satellite positioning system and method thereof

Growing community of inventors

Hsinchu County, Taiwan

Fu-Cheng Wang