| 摘要 |
<p>The device (100) has a phase-locked loop circuit (2) producing a clock signal with fixed frequency from a periodic reference signal of a crystal oscillator circuit (1). A digital frequency-modulation circuit (3) has a 1-bit digital sigma-delta modulator with bandpass filtering to produce a frequency-coded radio frequency (RF) transmission signal based on a series of numbers received at an input of the modulator. The circuit (3) converts binary values of a binary data signal into two components of the RF signal having respective frequencies offset with respect to an RF transmission channel. An independent claimS is included for a method for synthesizing a frequency-coded RF transmission signal, in order to transmit binary data by radio.</p> |
