公开(公告)号：US06566851B1

公开(公告)日：2003-05-20

申请号：US09636009

申请日：2000-08-10

申请人： Robert John Schuelke ,  Kevin P. Beaudoin

发明人： Robert John Schuelke ,  Kevin P. Beaudoin

IPC分类号： G05F316

CPC分类号： G05F3/262

摘要： A high-speed current mirror and correction circuitry are provided to minimize current errors in short-channel MOS switched current mirrors. The current mirror supplies high current levels at high modulation speeds, while simultaneously exhibiting good output voltage compliance. The correction circuitry includes a buffer amplifier, current shaping circuit, and replica mirror section. The current shaping circuit is able to supply a differential reference current, to correct load current errors, in response to the replica mirror section matching the buffered load voltage.

摘要翻译： 提供高速电流镜和校正电路以最小化短通道MOS开关电流镜中的电流误差。 电流镜在高调制速度下提供高电流，同时表现出良好的输出电压一致性。 校正电路包括缓冲放大器，电流整形电路和复制镜部分。 响应于与缓冲负载电压匹配的复制镜部分，当前整形电路能够提供差分参考电流以校正负载电流误差。

公开(公告)号：US06233285B1

公开(公告)日：2001-05-15

申请号：US08996978

申请日：1997-12-23

申请人： Kevin P. Beaudoin ,  Kevin D. Voegele

发明人： Kevin P. Beaudoin ,  Kevin D. Voegele

IPC分类号： H04B350

CPC分类号： H04L25/028 ,  H04L25/0292

摘要： A cable drive circuit allows a transmitter in a process control system to drive signals across a capacitive length of cable. The cable drive circuit uses a charge pump to store charge, which is then used in conjunction with open drain outputs to transmit logic signals across a cable to a peripheral at the other end of the cable. A microcontroller or other device specifies the number of communication pulses to send across the cable before allowing the charge pump to recharge. By transmitting communication pulses for a small percentage of the time the average current is minimized, making the circuit suitable for operation under the 4-2OmA standard for two-wire devices.

摘要翻译： 电缆驱动电路允许过程控制系统中的变送器通过电缆的电容长度驱动信号。 电缆驱动电路使用电荷泵来存储电荷，然后将电荷与开漏输出结合使用，以将电缆的逻辑信号传输到电缆另一端的外围设备。 微控制器或其他设备指定在允许电荷泵充电之前通过电缆发送的通信脉冲数。 通过在平均电流最小的一小段时间内传输通信脉冲，使得该电路适合于两线制设备的4-2OmA标准下运行。