Patent ID: 6724274
Filing Date: 2004-04-20
Classification: H03B

Abstract:
A frequency-switching oscillator for switching between a plurality of oscillation frequencies, said frequency-switching oscillator comprising:a resonance system; an amplification system connected to said resonance system; and a switching member provided only within said amplification system, said switching member being controllable to set an impedance of said amplification system, wherein said frequency-switching oscillator oscillates at a first oscillation frequency among said plurality of oscillation frequencies when said amplification system is set to a first impedance, and said frequency-switching oscillator oscillates at a second oscillation frequency among said plurality of oscillation frequencies when said amplification system is set to a second impedance, wherein said switching member changes a value of feedback capacitance of said amplification system to alter frequency characteristics of a negative resistance of the impedance of said amplification system, and wherein said resonance system has a resonant point between a phase of the impedance of said resonance system at said first oscillation frequency and a phase of the impedance of said resonance system at said second oscillation frequency.