| 摘要 |
<p>The present invention relates to a transmission circuit of a radio frequency signal, intended to receive an input signal (IN), comprising: a first frequency converter (FC1), having reference inputs intended to receive at least one differential signal, and intended to deliver a signal having a predetermined frequency called intermediate frequency, and a phase representative of that of the input signal (IN), and a second frequency converter (FC2) intended to deliver the radio frequency signal resulting from a conversion of the frequency of the output signal of the first frequency converter (FC1) into a tunable frequency. According to the invention, the first frequency converter (FC1) comprises digital means for selecting one of the reference inputs as a function of the value of the input signal (IN), for connecting it to the output of the first frequency converter (FC1). The invention enables to simplify the structure and the embodiment of the transmission circuit considerably and to improve the performance thereof. Application: Transmission of signals in radiotelephones.</p> |
