Patent ID: 6590465
Filing Date: 2003-07-08
Classification: H03B

Abstract:
A dual-band oscillator comprising:a first oscillation circuit; a second oscillation circuit; and a switch to alternatively operate the first oscillation circuit and the second oscillation circuit; the first oscillation circuit comprising: a first oscillation transistor; a first inductance element having a first end grounded and a second end coupled to a base of the first oscillation transistor; and a first emitter bias resistor to set an emitter current of the first oscillation transistor; the second oscillation circuit comprising: a second oscillation transistor; a second inductance element having a first end grounded and a second end coupled to a base of the second oscillation transistor; and a second emitter bias resistor to set an emitter current of the second oscillation transistor; wherein the first emitter bias resistor is provided between an emitter of the first oscillation transistor and the second inductance element, and the second emitter bias resistor is provided between an emitter of the second oscillation transistor and the first inductance element.