Signal processing circuit with voltage limiting function
- 申请公布号：
- US5459425(A)
- 申请号：
- US19930172168
- 申请日期：
- 1993.12.23
- 申请公布日期：
- 1995.10.17
- 申请人：
- MITSUBISHI DENKI KABUSHIKI KAISHA
- 发明人：
- YASUDA, YUKIO
- 分类号：
- H03G11/00;H03K3/0233;(IPC1-7):H03L5/00;H03K3/00;H03K17/60
- 主分类号：
- H03G11/00
- 摘要：
- A signal processing circuit for limiting a signal voltage generated, for example, across a signal source coil 1 within a range between a predetermined upper limit and a predetermined lower limit, includes: a second transistor pair 5a and 5b and a second transistor pair 5c and 5d coupled across the signal source coil 1. The base voltages of the transistors 5b and 5d are maintained at respective predetermined voltages by means of the serial circuit consisting of the resistor 5q, transistor 5e and the constant voltage source 5g and the serial circuit consisting of the constant voltage source 5h, transistor 5f and the resistor 5r, respectively, which are coupled across the voltage source 100. Thus, the second transistor pair 5a and 5b are turned on when the voltage at the signal input terminal 8 exceeds the upper limit. The second transistor pair 5c and 5 d are turned on when the voltage at the signal input terminal 8 falls below the lower limit.
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