JSSC 2007第12期Data Converters0.35μmDAC

10-bit Driver IC Using 3-bit DAC Embedded Operational Ampliﬁer for Spatial Optical Modulators (SOMs)

开发了一种用于激光投影全高清电视的10位驱动IC，采用3位DAC嵌入运算放大器。

0.35μm CMOS, 400 Mbps, 1.93μs settling time, 1.3 mV output voltage deviation

10位驱动IC激光投影mini-LVDS接口DAC结构输出电压偏差

▸采用mini-LVDS接口实现高速数据传输

▸提出7位电阻串DAC与3位线性DAC结合的DAC结构

▸通过补偿输出通道不均匀性实现低输出电压偏差

Abstract

A 10-bit driver IC for laser projection full high-deﬁ- nition TV (HDTV) applications using a spatial optical modulator (SOM) has been developed. For high-speed data transfer be- tween the timing controller and driver IC, the driver IC adopts a mini-LVDS interface that operates up to 400 Mbps. To reduce the chip area, a digital-to-analog converter (DAC) structure including a 7-bit resistor-string DAC and a unity-gain buffer, which has a 3-bit linear DAC, is proposed. The area of the proposed DAC is 40% smaller than that of the typical 8-bit resistor-string DAC. The driver IC, which has 546 channels, is fabricated using a 0.35- m CMOS process, and its area is /50/49 /55/48/48 m /51 /48/48/48 m. The mea- sured INL and DNL of the output voltages are less than 0.13 LSB, and the settling time is 1.93 s with 40 pF capacitive loads. The output voltage deviation of the driver IC is achieved as 1.3 mV by compensating the nonuniformity among output channels.