| 主权项 |
1. A signal processing apparatus comprising:
a frequency multiplier configured to perform an N-times frequency multiplication process on a modulated signal to generate a multiplied frequency signal, wherein the modulated signal is obtained as a result of an N phase-shift keying modulation process, wherein N is greater than 1 and corresponds to a number of phases utilized in the phase-shift keying modulation process; and an oscillator configured to oscillate the multiplied frequency signal as an injected signal to generate a signal obtained by dividing a frequency of the multiplied frequency signal by N, wherein the generated signal serves as a reproduced carrier from the modulated signal, wherein the oscillator comprises a resonant circuit and a negative-resistance circuit connected to each other, and the multiplied frequency signal is injected to the negative-resistance circuit as a current flowing to the negative-resistance circuit, and wherein the negative-resistance circuit comprises a pair of transistors connected to each other to form a cross-couple connection, and the frequency multiplier is a differential amplifier making use of another pair of transistors. |
