Abstract: A broad oscillation frequency range and good phase noise characteristic are achievable simultaneously by an oscillation circuit and a resonance circuit connected to the oscillation circuit. The resonance circuit includes an inductor element connected to the oscillation circuit, a first variable capacitance section connected to the inductor element, and a second variable capacitance section connected in parallel to the first variable capacitance section. The first variable capacitance section includes a first variable capacitive element connected to the inductor element, and a second variable capacitive element connected in parallel to the first variable capacitive element. The first variable capacitive element changes its capacity value based on a control voltage and a first reference voltage. The second variable capacitive element changes its capacity value based on the control voltage and a second reference voltage.

Abstract: A broad oscillation frequency range and good phase noise characteristic are achievable simultaneously by an oscillation circuit and a resonance circuit connected to the oscillation circuit. The resonance circuit includes an inductor element connected to the oscillation circuit, a first variable capacitance section connected to the inductor element, and a second variable capacitance section connected in parallel to the first variable capacitance section. The first variable capacitance section includes a first variable capacitive element connected to the inductor element, and a second variable capacitive element connected in parallel to the first variable capacitive element. The first variable capacitive element changes its capacity value based on a control voltage and a first reference voltage. The second variable capacitive element changes its capacity value based on the control voltage and a second reference voltage.

Abstract: A receiver includes (i) a first filter coupled to a first antenna and passing a signal in a first frequency band, (ii) a first receiver part for receiving the signal in the first frequency band from one of input terminals thereof coupled on the output side of the first filter, (iii) a second filter coupled to the first antenna and passing a signal in a second frequency band, and (iv) a second receiver part for receiving the signal in the second frequency band from one of input terminals thereof coupled on the output side of the second filter. The receiver makes diversity reception of a signal in a third frequency band received from the other input terminal of the first receiver part, and a signal in the third frequency band received from the other input terminal of the second receiver part.

Abstract: A receiver includes (i) a first filter coupled to a first antenna and passing a signal in a first frequency band, (ii) a first receiver part for receiving the signal in the first frequency band from one of input terminals thereof coupled on the output side of the first filter, (iii) a second filter coupled to the first antenna and passing a signal in a second frequency band, and (iv) a second receiver part for receiving the signal in the second frequency band from one of input terminals thereof coupled on the output side of the second filter. The receiver makes diversity reception of a signal in a third frequency band received from the other input terminal of the first receiver part, and a signal in the third frequency band received from the other input terminal of the second receiver part.