| 摘要 |
Two types of high-pass filter circuit and a band-pass filter circuit are provided. Both types of high-pass filter circuit include a capacitor (1) configured to input an input signal, a resistor (2, 2A, 2B) connected between an output terminal of the capacitor (1) and a prescribed bias voltage, and a signal output circuit (5) connected to the output terminal of the capacitor (1) and configured to buffer-amplify the input signal for output. In one of the two types of high-pass filter circuits, the resistor (2) is formed on an SOI semiconductor substrate and includes two PN junction diodes (3, 4) that are inversely connected to each other in parallel. In the other one of the high-pass filter circuits, the resistor (2A, 2B) is formed on an SOI semiconductor substrate and includes two MOS transistors (6, 7, 8. 9) that are inversely connected to each other in parallel. |
