Patent ID: 7239209

Claim:
An oscillator, comprising: a first oscillator circuit which has a resonant circuit and a plurality of transistors; and a second oscillator circuit which has a resonant circuit and a plurality of transistors, wherein: the first oscillator circuit is provided with first and second transistors so that a first conductive terminal of the first transistor is connected to a first conductive terminal of the second transistor and a second conductive terminal of the first transistor and a second conductive terminal of the second transistor are respectively connected to the resonant circuit, and the second conductive terminal of the first transistor is connected to a control terminal of the second transistor directly or via a capacitor, and a control terminal of the first transistor is connected to the second conductive terminal of the second transistor directly or via a capacitor, and the second oscillator circuit is provided with third and fourth transistors so that a first conductive terminal of the third transistor is connected to a first conductive terminal of the fourth transistor and a second conductive terminal of the third transistor and a second conductive terminal of the fourth transistor are respectively connected to the resonant circuit, and the second conductive terminal of the third transistor is connected to a control terminal of the fourth transistor directly or via a capacitor, and a control terminal of the third transistor is connected to the second conductive terminal of the fourth transistor directly or via a capacitor, and a coupling capacitor and a coupling resistor are serially provided between the second conductive terminal of the first transistor and the control terminal of the fourth transistor, and a coupling capacitor and a coupling resistor are serially provided between the second conductive terminal of the second transistor and the control terminal of the third transistor, and a coupling capacitor and a coupling resistor are serially provided between the second conductive terminal of the third transistor and the control terminal of the first transistor, and a coupling capacitor and a coupling resistor are serially provided between the second conductive terminal of the fourth transistor and the control terminal of the second transistor.