Radio transmitter
View Patent ↗A radio transmitter includes a signal processing circuit splitting a basic modulating signal into first and second modulating signals and outputting the first and second modulating signals. A PLL decides a fundamental wave. A VCO forms a portion of the PLL and modulates the fundamental wave decided by the PLL in accordance with a voltage of the first modulating signal outputted from the signal processing circuit. A PLL circuit forms a portion of the PLL and varies a frequency division ratio to modulate the fundamental wave decided by the PLL in accordance with the second modulating signal outputted from the signal processing circuit.
1. A radio transmitter comprising:
a signal processing circuit splitting a basic modulating signal into first and second modulating signals and outputting the first and second modulating signals;
a PLL deciding a fundamental wave;
a VCO forming a portion of the PLL and modulating the fundamental wave decided by the PLL in accordance with a voltage of the first modulating signal outputted from the signal processing circuit;
a PLL circuit forming a portion of the PLL and varying a frequency division ratio to modulate the fundamental wave decided by the PLL in accordance with the second modulating signal outputted from the signal processing circuit; and
a phase adjustment section adjusting at least one of phases of the first and second modulating signals and thereby equalizing the phases of the first and second modulating signals.
2. A radio transmitter as recited in claim 1 , further comprising a frequency-response adjustment section adjusting at least one of frequency profiles of the first and second modulating signals.
3. A radio transmitter comprising:
a PLL providing a carrier;
a VCO in the PLL;
a frequency divider in the PLL and having a variable frequency division ratio;
a first path transferring a modulating signal and applying the transferred modulating signal to the VCO as a control voltage for the VCO to modulate the carrier in accordance with the modulating signal applied to the VCO;
a second path transferring the modulating signal and applying the transferred modulating signal to the frequency divider to vary the frequency division ratio of the frequency divider and thereby modulate the carrier in accordance with the modulating signal applied to the frequency divider; and
a phase adjuster adjusting at least one of phases of the modulating signal applied to the VCO and the modulating signal applied to the frequency divider and thereby equalizing the phases of the modulating signal applied to the VCO and the modulating signal applied to the frequency divider;
wherein the modulation of the carrier in accordance with the modulating signal applied to the VCO and the modulation of the carrier in accordance with the modulating signal applied to the frequency divider are simultaneously active.
4. A radio transmitter as recited in claim 3 , further comprising a frequency-response adjuster adjusting at least one of frequency profiles of the modulating signal applied to the VCO and the modulating signal applied to the frequency divider.