| 摘要 |
A transmitter including a continuous phase FSK modulator is disclosed for use primarily in optical transmission. The levels of output frequencies are achieved by switching a capacitor (C1) into and out of an oscillator circuit (T1, T2, L2, C2) by means of a PIN diode (D1) switch network and switchable current source (Q1) which is responsive to a binary data input. The resulting sinusoidal waveforms are squared up by means of an inverter with feedback control for adjusting the duty cycle. <IMAGE> |
