RF filter and digital broadcast receiving tuner and RF signal processing device using RF filter
First Claim
Patent Images
1. A radio frequency (RF) filter comprising:
- a band pass filter unit which filters on an input signal;
an amplifying unit which amplifies the input signal; and
a switching unit which activates the band pass filter unit if a frequency of the input signal is equal to or less than a specific frequency, and activates the amplifying unit if the frequency of the input signal is higher than the specific frequency.
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Abstract
A radio frequency (RF) filter is provided which includes a band pass filter unit and an amplifying unit. If a signal having a frequency in a first band is input, the RF filter performs band pass filtering, and if a signal having a frequency in a second band is input, the RF filter performs an amplifying process. The RF filter can be used for various RF signal processing devices, such as digital broadcast receiving tuners.
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Citations
16 Claims
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1. A radio frequency (RF) filter comprising:
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a band pass filter unit which filters on an input signal; an amplifying unit which amplifies the input signal; and a switching unit which activates the band pass filter unit if a frequency of the input signal is equal to or less than a specific frequency, and activates the amplifying unit if the frequency of the input signal is higher than the specific frequency. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A digital broadcast receiving tuner comprising:
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a radio frequency (RF) filter which filters an input signal if a frequency of the input signal is in a first band, and amplifies the input signal if the frequency of the input signal is in a second band; and a harmonic rejection mixer which mixes an output signal of the RF filter with a local oscillator spectrum. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A radio frequency (RF) signal processing device comprising:
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an RF filter which filters an input signal if a frequency of the input signal is equal to or less than a specific frequency, and amplifies the input signal if the frequency of the input signal is higher than the specific frequency; and a harmonic rejection mixer which mixes an output signal of the RF filter with a local oscillator spectrum. - View Dependent Claims (16)
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Specification