Compact radio frequency harmonic filter using integrated passive device technology
AssigneeFreescale Semiconductor, Inc.
InventorLianjun Liu
Life of this patent
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Abstract
A radio frequency (“RF”) harmonic filter circuit as disclosed herein is fabricated using integrated passive device (“IPD”) technology. The RF harmonic filter circuit is configured to provide second, third, and fourth harmonic rejection while providing good input and output impedance matching. The RF harmonic filter circuit employs only one IPD loop inductance (preferably used for a second harmonic resonance circuit), which results in a significant die/package size reduction. The RF harmonic filter circuit also employs a combined circuit that performs input and/or output impedance matching and third harmonic rejection.
Claims25
A radio frequency (“RF”) harmonic filter circuit fabricated using integrated passive device (“IPD”) process technology, said RF harmonic filter circuit comprising:
- a substrate;
- a first IPD capacitance formed on said substrate, said first IPD capacitance having an RF input node and an RF output node;
- an IPD inductance formed on said substrate, said IPD inductance being connected in parallel with said first IPD capacitance;
- a second IPD capacitance formed on said substrate, said second IPD capacitance being connected to said RF input node;
- and
- a third IPD capacitance formed on said substrate, said third IPD capacitance being connected to said RF output node.
A radio frequency (“RF”) harmonic filter circuit fabricated using integrated passive device (“IPD”) process technology, said RF harmonic filter circuit comprising:
- a substrate;
- an RF input pad formed on said substrate;
- an RF output pad formed on said substrate;
- a second harmonic resonance circuit formed on said substrate and connected between said RF input pad and said RF output pad, said second harmonic resonance circuit comprising an IPD inductance and a first IPD capacitance;
- a combined third harmonic resonance and input matching circuit connected to said RF input pad;
- and
- a combined fourth harmonic resonance and output matching circuit connected to said RF output pad.
A radio frequency (“RF”) harmonic filter circuit fabricated using integrated passive device (“IPD”) process technology, said RF harmonic filter circuit comprising:
- a substrate;
- an RF input pad formed on said substrate;
- an RF output pad formed on said substrate;
- a second harmonic resonance circuit formed on said substrate and connected between said RF input pad and said RF output pad, said second harmonic resonance circuit comprising an IPD inductance and a first IPD capacitance;
- and
- a combined third harmonic resonance, input matching, and output matching circuit connected between said RF input pad and said RF output pad.
A radio frequency (“RF”) harmonic filter circuit fabricated using integrated passive device (“IPD”) process technology, said RF harmonic filter circuit comprising:
- a substrate;
- only one IPD loop inductance formed on said substrate;
- and
- a harmonic resonance circuit formed on said substrate, said harmonic resonance circuit including said IPD loop inductance.
Dependencies are inferred from the claim text.