| 摘要 |
PURPOSE:To obtain an FM demodulator suitable for circuit integration, by obtaining a pulse with a given time width in synchronizing with leading and trailing of an FM signal waveform and obtaining an FM demodulation output from the output through a low-pass filter. CONSTITUTION:A potential of VCC-DELTAV is given at point C with bias resistors R1, R2 and FM signals in opposite phase and with potentials of VCC and VCC-2DELTAV are inputted to terminals A and B. Every time the polarity of the input signals is inverted, a capacitor Cx is charged/discharged from -DELTAV to DELTAV or DELTAV to -DELTAV, and an output is obtained from a resistor R3 for a given time when this charge/discharge current flows, and an FM demodulation output is obtained by flowing this to a low- pass filter 1. |
