Transmission circuit for data in asynchronous mode via a free receiving frequency coupled with the sending frequency

摘要

The circuit includes a transmit command voltage oscillator (31) and a receiver voltage oscillator (32). A transmitter (1) includes a multivibrator oscillator (35). The input phase difference (TE+,TE-) in a PLL (5,9) is fed to a differential amplifier (34) which is mounted in a voltage-current converter. A reference current for the multivibrator oscillator is generated. A receiver circuit receives input phase differences (RE+, RE-) which drive a differential amplifier (36). The transmitter reference current (IoscTx) is fed to the differential amplifier to produce an output reference current (IoscRx) which adjusts the frequency of a receiver multivibrator (37). The transmitter and receiver oscillators have a common reference drive.