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1. 发明授权

US4097753A Comparator circuit for a C-2C A/D and D/A converter 失效
标题翻译： C-2C A / D和D / A转换器的比较器电路
公开(公告)号：US4097753A
公开(公告)日：1978-06-27
申请号：US673178
申请日：1976-04-02
申请人： Peter William Cook , James Thomas Parrish , Stanley Everett Schuster
发明人： Peter William Cook , James Thomas Parrish , Stanley Everett Schuster
IPC分类号： H03M1/10 , H03K5/08 , H03M1/00 , H03M1/38 , H03K5/20
CPC分类号： H03M1/1245
摘要： A comparator circuit for comparing two voltage levels in a C-2C A/D and D/A converter, comprising four cross-coupled active devices (FETs) in a latch arrangement whereby an offset voltage is used to compensate for imbalances in the comparator. The comparator includes a first FET having its gate electrode connected to the output of the D/A converter, and a second FET having its gate electrode connected to an analog input voltage. The first and second FETs each have one of their electrodes connected to a common voltage source. A third and a fourth FET have one of their electrodes connected respectively to the other electrode of the first and second FETs at first and second common nodes, respectively. The output of the comparator is provided at one of such first and second common nodes. The first and second nodes are also respectively connected to the gate electrodes of the fourth and third FETs in a cross-coupled arrangement. The other electrode of both the third and fourth FETs are connected to a common phase voltage source. An offset voltage is generated at the input to either of the gate electrodes of the first and second FETs to set the comparator at a balance point and thereby compensate for the differences in the threshold voltages and current carrying capabilities of the four FETs. Also, the comparator has relatively high input impedance, gain and bandwidth.
摘要翻译：一种用于比较C-2C A / D和D / A转换器中的两个电压电平的比较器电路，其包括锁存装置中的四个交叉耦合有源器件（FET），由此使用偏移电压来补偿比较器中的不平衡。比较器包括其栅电极连接到D / A转换器的输出的第一FET，以及其栅电极连接到模拟输入电压的第二FET。第一和第二FET各自具有连接到公共电压源的电极中的一个。第三和第四FET分别具有在第一和第二公共节点分别连接到第一和第二FET的另一个电极的一个电极。比较器的输出被提供在这样的第一和第二公共节点之一处。第一和第二节点也以交叉耦合的方式分别连接到第四和第三FET的栅电极。第三和第三FET的另一个电极连接到公共相电压源。在第一和第二FET的栅电极的输入处产生偏移电压，以将比较器设置在平衡点，从而补偿四个FET的阈值电压和载流能力的差异。此外，比较器具有相对较高的输入阻抗，增益和带宽。

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