VARIABLE-FREQUENCY FILTER, RF FRONT END CIRCUIT, AND COMMUNICATION DEVICE

• Main Authors: WADA, Takaya, NOSAKA, Koji
• Format: Patent
• Language: English; French; Japanese
• Published: 27.04.2017
• Subjects: BASIC ELECTRONIC CIRCUITRY; ELECTRICITY; IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS

A variable-frequency filter (10) is provided with a series arm resonance circuit (20) and a parallel arm resonance circuit (30). The series arm resonance circuit (20) is provided with acoustic wave resonance circuits (21, 22, 23) having different resonant frequencies, a variable capacitor (VC20) and...