LOCAL OSCILLATOR GENERATION SYSTEM AND GENERATION METHOD THEREOF
First Claim
1. A band-pass filter, comprising:
- a base band-pass filter circuit configured to filter signals and output differential signals via a first filter output node and a second filter output node; and
a bandwidth adjusting circuit connected to the first filter output node and the second filter output node and configured to narrow a passband of the base band-pass filter circuit.
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Accused Products
Abstract
A local oscillator generation system includes a first frequency divider configured to divide frequencies of a first voltage controlled oscillator signal and a second voltage controlled oscillator signal by 2, and output a first divided signal and a second divided signal; a mixer configured to mix the first voltage controlled oscillator signal, the second voltage controlled oscillator signal, the first divided signal, and the second divided signal, and output a first frequency mixed signal and a second frequency mixed signal; a transimpedance amplifier configured to amplify the first frequency mixed signal and the second frequency mixed signal, and output a first amplified signal and a second amplified signal; and a band-pass filter configured to filter the first amplified signal and the second amplified signal, and output a first filtered signal and a second amplified signal.
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Citations
25 Claims
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1. A band-pass filter, comprising:
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a base band-pass filter circuit configured to filter signals and output differential signals via a first filter output node and a second filter output node; and a bandwidth adjusting circuit connected to the first filter output node and the second filter output node and configured to narrow a passband of the base band-pass filter circuit. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A filtering method, comprising:
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filtering signals and outputting differential signals via a first filter output node and a second filter output node in a base filtering step; and narrowing a passband in the base filtering step and outputting a narrowed result via the first filter output node and the second filter output node. - View Dependent Claims (8, 9, 10, 11)
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12. A local oscillator generation system, comprising:
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a first frequency divider configured to receive differential signals including a first voltage controlled oscillator signal and a second voltage controlled oscillator signal outputted by a voltage controlled oscillator, configured to divide frequencies of the first voltage controlled oscillator signal and the second voltage controlled oscillator signal by 2, and configured to output a first divided signal and a second divided signal; a mixer configured to receive and mix the first voltage controlled oscillator signal, the second voltage controlled oscillator signal, the first divided signal, and the second divided signal, and configured to output a first frequency mixed signal and a second frequency mixed signal; a transimpedance amplifier configured to receive and amplify the first frequency mixed signal and the second frequency mixed signal, and configured to output a first amplified signal and a second amplified signal; and a band-pass filter configured to receive and filter the first amplified signal and the second amplified signal, and configured to output a first filtered signal and a second amplified signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A local oscillator generation method, comprising.
receiving differential signals including a first voltage controlled oscillator signal and a second voltage controlled oscillator signal outputted by a voltage controlled oscillator, dividing frequencies of the first voltage controlled oscillator signal and the second voltage controlled oscillator signal by 2, and outputting a first divided signal and a second divided signal in a frequency dividing step; -
receiving and mixing the first voltage controlled oscillator signal, the second voltage controlled oscillator signal, the first divided signal, and the second divided signal, and outputting a first frequency mixed signal and a second frequency mixed signal in a mixing step; receiving and amplifying the first frequency mixed signal and the second frequency mixed signal, and outputting a first amplified signal and a second amplified signal in an amplifying step; and receiving and filtering the first amplified signal and the second amplified signal, and outputting a first filtered signal and a second amplified signal in a filtering step. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification