Macronix International Co., Ltd.

Novatek Microelectronics Corp.

Yue-Zen Lin

Chui-Hsun Chiu

Chung-Chin Huang

Chien-Kuo Wang

An apparatus and a method for gain adjustment for analog YPbPr signals are provided. The apparatus comprises a first clamping circuit, an analog-to-digital converter (ADC), and a gain calculator. The first clamping circuit clamps the lowest potential of a horizontal synchronization signal of a Y signal of an analog YPbPr signal to 0 V. The ADC converts the clamped Y signal from an analog signal to a digital signal and then outputs the digital signal. The gain calculator receives the actual peak-to-peak voltage of the horizontal synchronization signal from the ADC, and then calculates and sets the gain for the ADC according to the peak-to-peak voltage.

Apparatus and method for gain adjustment for analog YPbPr signals

A programmable and input voltage independent reference voltage generator. Size of reference voltage can be adjusted by controlling size of current using current mirrors and MOS switches. No decoding circuit is necessary. By adjusting the resistance value, current mirror and dimensional ratio of MOS, a chip area smaller than a decoding circuit can be used to accommodate the reference voltage generator. The reference voltage generator is able to provide an adjustable and stable reference voltage to different types of electronic modules. By providing a highly flexible reference voltage, performance of any circuits using the generator is boosted.

Growing community of inventors

Hsinchu, Taiwan

Yue-Zen Lin