一种含相加器的高速12位D/A转换器

A High Speed 12 Bit Digital to Analog Converter with Built in Adders

阐述了一种含相加器的高速１２位Ｄ／Ａ转换器的设计和应用。该电路实现Ｉ－Ｖ转换和相加器功能仅用１级视频运放。其内含相加器的小信号带宽为３０～４０ＭＨｚ，传输延迟１５ｎｓ。该Ｄ／Ａ转换器的稳定时间为２５０ｎｓ。用于压控振荡器时，可获得的最高输出电压仅比＋Ｖｓ低２～３Ｖ。在全温范围内，其线性误差、微分线性误差、相加器线性误差、相加器微分线性误差分别达到±１／２ＬＳＢ。

A high speed 12 bit D/A converter with adders is described. The circuit realizes I V conversion and adder′s function with only a single stage of video frequency operational amplifier. The small signal bandwidth for the built in adders is 30～40 MHz, and the propagation delay is 15 ns. The D/A converter achieves a settling time of 250 ns. The maximum output voltage for voltage controlled oscillators is only 2～3 V lower than + V s.The linear error, differential linear error, linear error of adders, and differential linear error of adders reach ±1/2 LSB,respectively, in all temperature ranges.