Filtering Using Impedance Translator
First Claim
Patent Images
1. A device including:
- a receiver having a low noise amplifier (LNA), the LNA comprising;
an amplifier configured to operate in an RF domain, to receive an overall signal containing a component at a reception frequency and a component at a transmission frequency, to amplify the component at the reception frequency, and to output the amplified component at the reception frequency;
a first load connected to the amplifier;
a first mixer;
a second reactive load connected to the first mixer, the first mixer and the second reactive load connected in parallel with the first load, the second reactive load having a reactance which when translated to an impedance by the first mixer either shorts the component at the transmission frequency or presents an open circuit to the component at the reception frequency; and
a second mixer connected to the output of the amplifier and being configured to mix the amplified component and to output a resulting signal at a base band frequency; and
an antenna in communication with the receiver.
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Abstract
This disclosure relates to low noise amplifiers (LNAs) and more particularly to LNAs integrated on integrated circuit (IC) chips along with radio frequency (RF) amplifiers.
35 Citations
20 Claims
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1. A device including:
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a receiver having a low noise amplifier (LNA), the LNA comprising; an amplifier configured to operate in an RF domain, to receive an overall signal containing a component at a reception frequency and a component at a transmission frequency, to amplify the component at the reception frequency, and to output the amplified component at the reception frequency; a first load connected to the amplifier; a first mixer; a second reactive load connected to the first mixer, the first mixer and the second reactive load connected in parallel with the first load, the second reactive load having a reactance which when translated to an impedance by the first mixer either shorts the component at the transmission frequency or presents an open circuit to the component at the reception frequency; and a second mixer connected to the output of the amplifier and being configured to mix the amplified component and to output a resulting signal at a base band frequency; and an antenna in communication with the receiver. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A receiver comprising:
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an amplifier to receive an overall signal containing a component at a reception frequency and a component at a transmission frequency, to amplify the component at the reception frequency, and to output the amplified component at the reception frequency; a first load connected to the amplifier; a mixer; and a second reactive load connected to the mixer, the mixer and the second reactive load connected in parallel with the first load, the second reactive load having a reactance which when translated to an impedance by the mixer either shorts the component at the transmission frequency or presents an open circuit to the component at the reception frequency. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of receiving an RF signal comprising:
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receiving an overall RF signal containing a component at a reception frequency and a component at a transmission frequency; using a mixer to translate a reactance of a first reactive load to an impedance; using the translated reactance to at least one of short the component at the transmission frequency or to present an open circuit to the component at the reception frequency; amplifying the component at the reception frequency using an amplifier containing a second load and being configured to operate in the RF domain; and outputting the amplified component at the reception frequency. - View Dependent Claims (18, 19, 20)
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Specification