Polyphase-notchfilter
AssigneeKoninklijke Philips Electronics N.V.
InventorDick Burkhard
Life of this patent
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Abstract
The invention relates to a Polyphase-Notchfilter for filtering input signals comprising known bandpass filters, which comprise voltage-controlled current sources. To provide an integrated circuit that has notch filter functionality with reduced circuit erogation, that allows high suppression with little matching effort and reduced power consumption it is proposed that at least two second voltage-controlled current sources are provided, that said at least four input means are coupled to said at least two second voltage-controlled current sources, and that said at least four output means are coupled to said at least two second voltage-controlled current sources, and that said at least one second voltage-controlled current sources are coupled antiparallel to bandpass filter.
Claims12
Polyphase-Notchfilter for filtering input signals comprising:
- bandpass filter means comprising,
- at least four first voltage-controlled current sources,
- at least four input means coupled to said at least four first voltage-controlled current sources for connecting input signals to said filter means,
- at least four output means coupled to said at least four first voltage-controlled current sources, providing filtered output signals of said input signals, and
- supply voltage input means for connecting a power supply for said circuit arrangement, characterized in that
- at least two second voltage-controlled current sources are provided,
- that said at least four input means are coupled to said at least two second voltage-controlled current sources, and
- that said at least four output means are coupled to said at least two second voltage-controlled current sources, and
- that said at least two second voltage-controlled current sources are coupled anti-parallel to two of said at least four first voltage-controlled current sources of said filter means, respectively.
Dependencies are inferred from the claim text.