| 摘要 |
The invention relates to a switchable low-pass filter arrangement which has an upper limiting frequency determining the low-pass filter behavior. The arrangement includes a transistor circuit, which has at least one transistor arranged as a source follower or as an emitter follower; a capacitive component at the output of the transistor circuit; and a programmable device for setting the operating current of the transistor circuit. In this case, the limiting frequency of the low-pass filter arrangement is switchable by means of the programmable device for setting the operating current of the transistor circuit. This creates a switchable low-pass filter arrangement which does not have any changeover switches in the signal path, is suitable for radiofrequency applications and can be produced in a simple manner. The invention furthermore relates to an optical receiver having a low-pass filter arrangement of this type.
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