| 摘要 |
The oscillator (1) has first frequency determining elements (13-16) for a first oscillation frequency. It also has at least one second frequency determining element (23,24) which is connected to the first frequency determining element (13-16) via at least one switching diode (25,26), to set the oscillator (1) to a second oscillating frequency. The oscillator has a supply circuit (27-44,54) with at least one controllable current source (27-30). This feeds the switching diode (25,26). By changing the control, the diode (25,26) is switched between its conductive and non-conductive state. Another current source (4) feeds the oscillator (1). The oscillator current source (4) is controlled by the supply circuit, together with the control of the controllable source (27-30). The influences on the operating point and the oscillation amplitude of the oscillator (1) are equalised by switching to the second frequency determining element. |
