| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a pulse modulation circuit comprising an existing circuit which implements a compact circuit comprising a reduced number of elements by dispensing with a dedicated circuit provided for the addition of the function of a phase modulation circuit.SOLUTION: The pulse modulation circuit includes: a switch 1 for pulse-modulating a high frequency input signal to a local oscillation wave according to a control input signal for on/off switching; a harmonic mixer 2 for frequency-mixing the local oscillation wave signal with an intermediate wave signal to output a high frequency modulation signal; a pulse signal generator 3 for generating a pulse signal modulating with positive and negative voltage amplitudes and inputting the generated pulse signal as the intermediate wave signal into the harmonic mixer 2; and a logic transformation circuit 9 for inputting a pulse signal modulating with an amplitude obtained by multiplying an absolute voltage of the pulse signal generated by the pulse signal generator 3 by a predetermined coefficient, as the control input signal into the switch 1.</p> |
