Mediatek Corporation

Bing-jye Kuo

Chinq-Shiun Chiu

Shou-Tsung Wang

A steering and mixing module comprises a double balanced switch quad and a steering quad. The double balanced switch quad comprises a first output pair, and the first output pair is coupled to a first load stage. The steering quad comprises a second output pair, and the second output pair is coupled to a second load stage. The double balanced switch quad and the steering quad share an input pair.

Self-calibrating direct conversion transmitter with converting/steering device

A converting/steering device has a normal mode and a calibration mode. The converting/steering device includes a merged mixer/VGA and a mode controller. The merged mixer/VGA has a mixing stage and an amplifying stage. In the normal mode, the mode controller deactivates the mixing stage of the merged mixer/VGA, and the device operates as an RF VGA. In the calibration mode, the mode controller activates the mixing stage of the merged mixer/VGA and passes a local oscillator signal to the mixing stage, so that the device operates as a down-mixer.

An apparatus and method for internally calibrating a direct conversion receiver (DCR) through feeding a calibration signal via ESD protection circuitry is disclosed. The apparatus includes an internal signal generator for generating a calibration signal, a front-end input stage for receiving an RF signal at an input node, an ESD protection unit for protecting against electrostatic discharge, and a switch unit coupled to the ESD protection unit, for selectively passing a calibration signal to the front-end input stage, whereby the connection of the switch unit and the ESD protection unit means that when the DCR is operating in normal mode, the switch unit will not affect the noise performance and matching of the receiver.

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Taipei, Taiwan

Bing-jye Kuo