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本文介绍一种高速双16位D/A转换器。在二进制加权的电流网络中,使用了一种动态电流分流器来获得要求的高精度6位最高有效位而勿需任何调整步骤或微调技术。为了建立10位最低有效位,采用了一种新方法,以便根据晶体管的发射极按比例变化原则构成无源分流器级。由于快速建立和低的短时脉冲干扰电流而使位开关最佳化,所以在高达200kHz采样频率下都可使用这两个转换器而不用外接采/保电路或消蠕电路。在-20—+70℃的温度范围内,该转换器具有0.5LSB的微分线性度。转换器的高线性度使它在音频频带内产生的失真为0.001％。该芯片采用标准双极工艺制作,芯片面积为3.8×5.5mm~2。
This article describes a high-speed dual 16-bit D / A converter. In a binary-weighted current network, a dynamic current shunt is used to obtain the required high-precision 6-bit most significant bits without any adjustment steps or trimming techniques. In order to create the least significant 10 bits, a new method is adopted to make the passive shunt stage based on the principle of the transistor’s emitter being scaled. Due to the fast settling and the optimization of the bit switches for low glitch currents, both converters can be used at up to 200kHz sampling frequency without the need for external pick-and-latch or de-creepage circuits. The converter has a differential linearity of 0.5LSB over the -20- + 70 ° C temperature range. The high linearity of the converter gives it 0.001% distortion in the audio band. The chip uses a standard bipolar process, the chip area of 3.8 × 5.5mm ~ 2.