Patent ID: 8948307
Filing Date: 2015-02-03
Classification: H04L

Abstract:
1. An ASK (Amplitude Shift Keying) signal generator comprising: a differential oscillator configured to include first and second output terminals and generate a first signal and a second signal with an opposite phase of the first signal, the differential oscillator outputting the first signal from the first output terminal and outputting the second signal from the second output terminal; a first modulator connected to the first output terminal of the differential oscillator, configured to be set in a normally off state; a second modulator connected to the second output terminal of the differential oscillator, configured to turn on/off according to a modulated signal; a first transmission line connected to the first output terminal of the differential oscillator and having a first length equal to a ¼ wavelength of the oscillation frequency of the differential oscillator; a second transmission line connected to the second output terminal of the differential oscillator, having a second length equal to a ¼ wavelength of the oscillation frequency of the differential oscillator and having an output terminal connected to an output terminal of the first transmission line; and an impedance adjustment circuit connected to the output terminals of the first and second transmission lines, configured to operate together with the second modulator according to the modulated signal.