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Comparator circuit for generating a control signal corresponding to a difference voltage between a battery voltage and a power supply voltage
Comparator circuit for generating a control signal corresponding to a difference voltage between a battery voltage and a power supply voltage
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机译:比较器电路,用于产生与电池电压和电源电压之间的电压差相对应的控制信号
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摘要
A comparator circuit (31) for sensing a voltage difference between a battery voltage and a power supply voltage is coupled to a switch (39). The comparator circuit is capable of accurately sensing a voltage near the power supply voltage. The comparator circuit (31) comprises a first amplification stage (32-36), a second amplification stage (37), and a Schmitt trigger (38). The first amplification stage (32- 36) includes a first source follower (32) and a second source follower (33) for generating a differential voltage corresponding to a difference voltage between the battery voltage and the power supply voltage. The first amplification stage (32-36) reduces problems in amplifying voltage near the power supply voltage by level shifting the voltage through the use of source followers and insuring transistors operate in a saturation region of operation. The second amplification stage (37) further amplifies the difference voltage between the battery voltage and the power supply voltage. The Schmitt trigger (38) provides a logic signal for controlling the switch (39).
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