Self-matching band-pass filter and related frequency down converter
AssigneeWistron Neweb Corp.
InventorsChe-Ming Wang, Wen-Tsai Tsai
Life of this patent
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Abstract
A band-pass filter includes an input port, an output port, and a plurality of resonators. The input port is utilized for receiving a radio frequency signal. The output port is utilized for outputting a filtered signal. The plurality of resonators are placed between the input port and the output port, and are utilized for band-pass filtering the radio frequency signal for generating the filtered signal, wherein the plurality of resonators comprise at least two different trace widths for matching the output impedance of the band-pass filter with the input impedance of a rear-stage circuit coupled to the output port.
Claims30
A band-pass filter comprising:
- an input port for receiving a radio frequency signal;
- an output port for outputting a filtered signal;
- and
- a plurality of resonators placed between the input port and the output port, for performing band-pass filtering on the radio frequency signal to generate the filtered signal, wherein the plurality of resonators comprise at least two different trace widths for matching the output impedance of the band-pass filter with the input impedance of a rear-stage circuit coupled to the output port.
A band-pass filter comprising:
- an input port for receiving a radio frequency signal;
- an output port for outputting a filtered signal;
- and
- a resonator placed between the input port and the output port, for performing band-pass filtering on the radio-frequency signal to generate the filtered signal, wherein the trace width of the resonator is different from the trace width of the input port for matching the output impedance of the band-pass filter with the input impedance of a rear-stage circuit coupled to the output port.
A down converter for a wireless communication receiver comprising:
- a mixer for downconverting the frequency of a filtered signal according to a local oscillating signal, for outputting an intermediate frequency signal;
- and
- a band-pass filter, coupled to the mixer, comprising:
- an input port for receiving a radio frequency signal;
- an output port for outputting a filtered signal;
- and
- a plurality of resonators placed between the input port and the output port, for performing band-pass filtering on the radio frequency signal to generate the filtered signal, wherein the plurality of resonators comprise at least two different trace widths for matching the output impedance of the band-pass filter with the input impedance of a rear-stage circuit coupled to the output port.
A down converter for a wireless communication receiver comprising:
- a mixer for downconverting the frequency of a filtered signal according to a local oscillating signal, for outputting an intermediate frequency signal;
- and
- a band-pass filter, coupled to the mixer, comprising:
- an input port for receiving a radio frequency signal;
- an output port for outputting a filtered signal;
- and
- a resonator placed between the input port and the output port, for performing band-pass filtering on the radio frequency signal to generate the filtered signal, wherein the trace width of the resonator is different from the trace width of the input port for matching the output impedance of the band-pass filter with the input impedance of a rear-stage circuit coupled to the output port.
Dependencies are inferred from the claim text.