| 摘要 |
<p>A surface acoustic wave oscillator includes: a cross-coupled circuit (10) including a pair of a first active element (N1) and a second active element (N2) differentially connected to a first output terminal and a second output terminal; a first surface acoustic wave element (20) and a second surface acoustic wave element (30) having different resonance frequencies and connected to the cross-coupled circuit in parallel; a first variable capacitance circuit (100) including a first variable capacitance element and changing the resonance frequency of the first surface acoustic wave element, the first variable capacitance element changing in its capacitance value in accordance with a first control voltage applied from a first control terminal; and a second variable capacitance circuit (200) including a second variable capacitance element and changing the resonance frequency of the second surface acoustic wave element, the second variable capacitance element changing its capacitance value in accordance with a second control voltage applied from a second control terminal, in which the first surface acoustic wave element (20) and the first variable capacitance circuit (100) are connected and the second surface acoustic wave element (30) and the second variable capacitance circuit (200) are connected, and oscillating outputs obtained by combining the outputs of the first surface acoustic wave element and the second surface acoustic wave element are outputted by the cross-coupled circuit (10).</p> |
