| 摘要 |
To provide a circuit arrangement for protecting the input of an integrated circuit particularly suitable for analog signals, more specifically a CMOS circuit, against overvoltages, said circuit arrangement (100) comprising:at least two input terminals (10; 20) andat least one protection stage (S) in which each input terminal (10; 20) is connected to a power supply voltage (US) by a respective protection diode (12; 22), particularly a semiconductor diode, and to a reference potential (UR) by a respective protection diode (16; 26), particularly a semiconductor diode, by which, on the one hand, disturbing demodulation effects affecting the signal path can be reliably avoided in the input signal due to a simple and low-cost structure, and, on the other hand, effective protection of overvoltages caused by electrostatic discharges is ensured, it is proposed thatat least a further diode (14, 18; 24; 28) is arranged in series with each protection diode (12, 16; 22, 26), andthe protection stage (S) precedes at least a filter stage (F), particularly at least a high-frequency filter stage.
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