Mediatek Corporation

Mediatek Singapore Pte. Ltd.

Min Jie Wu

Beng Ong

Chang-Fu Kuo

Wee Liang Lien

A Global Positioning System (GPS) receiver integrated with a cellular phone system, comprising a single-balanced mixer, a poly phase filter, a channel select filter, an analog-to-digital converter, a reference frequency source, and a PLL unit is disclosed. The single-balanced mixer downconverts a GPS signal to generate an in-phase signal I and a quadrature signal Q. The poly phase filter generates an IF signal based on the in-phase signal I and the quadrature signal Q. The channel select filter receives the IF signal to filter unwanted channel signals. The analog-to-digital converter converts the signal from the channel select filter to a digital output signal. The reference frequency source provides a reference frequency to the analog-to-digital converter. The PLL unit receives the reference frequency for generating a clock signal to the single-balanced mixer for downconversion.

Mobile communication system with integrated GPS receiver

A system capable of limiting a current through a load and a method thereof. The system comprises a current sensor, a determination circuit, and a current mirror circuit. The current sensor, coupled to the load, produces a current indication indicating the current. The determination circuit, coupled to the current sensor, generates a short-circuit signal when the current exceeds a predetermined threshold. The current mirror circuit, coupled to a voltage source, the current sensor and the determination circuit, comprises a current mirror and a bypass path, delivers a mirrored current from the current mirror to the load upon receiving the short-circuit signal, and passes the current from the voltage source through the bypass path to the load in the absence of the short-circuit signal.

Growing community of inventors

Singapore, Singapore

Min Jie Wu