Gain measurement circuit, gain measurement method, and communication apparatus
First Claim
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1. A gain measurement circuit of a receiver, comprising:
- a frequency mixer that receives a reception signal, mixes the reception signal with a local signal from an oscillator, and outputs an intermediate frequency signal; and
a phase controller that extracts a first part of the local signal, sets a different phase for the first part, and outputs a second part as the reception signal, the second part having been phase-shifted;
wherein, for the different phase set by the phase controller, a direct-current voltage of the intermediate frequency signal output from the frequency mixer is detected, a conversion gain of the frequency mixer is obtained, and a gain of the receiver is calculated.
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Abstract
A gain measurement circuit of a receiver includes a frequency mixer that receives a reception signal, mixes the reception signal with a local signal from an oscillator, and outputs an intermediate frequency signal; and a phase controller that extracts a part of the local signal, sets a different phase for the part, and outputs the part as the reception signal; wherein, for the different phase set by the phase controller, a direct-current voltage of the intermediate frequency signal output from the frequency mixer is detected, a conversion gain of the frequency mixer is obtained, and a gain of the receiver is calculated.
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Citations
15 Claims
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1. A gain measurement circuit of a receiver, comprising:
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a frequency mixer that receives a reception signal, mixes the reception signal with a local signal from an oscillator, and outputs an intermediate frequency signal; and a phase controller that extracts a first part of the local signal, sets a different phase for the first part, and outputs a second part as the reception signal, the second part having been phase-shifted; wherein, for the different phase set by the phase controller, a direct-current voltage of the intermediate frequency signal output from the frequency mixer is detected, a conversion gain of the frequency mixer is obtained, and a gain of the receiver is calculated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of measuring a gain of a receiver having a frequency mixer that receives a reception signal, mixes the reception signal with a local signal from an oscillator, and outputs an intermediate frequency signal, the method comprising:
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extracting a first part of the local signal, setting at least two different phases excluding 180 degrees for the first part, and outputting a second part as the reception signal, the second part having been phase-shifted; detecting a direct-current voltage of the intermediate frequency signal output from the frequency mixer for the at least two different phases; measuring power of the reception signal or an output signal from the low noise amplifier that amplifies the reception signal; and measuring the gain of the receiver by calculating the conversion gain of the frequency mixer based on the direct-current voltage of the intermediate frequency signal, the set at least two different phases, and the power of the reception signal or the output signal from the low noise amplifier. - View Dependent Claims (12, 13)
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14. A communication apparatus comprising:
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a receiver including the gain measurement circuit of a receiver; and a transmitter that sends a transmission signal, wherein a gain measurement circuit includes; a frequency mixer that receives a reception signal, mixes the reception signal with a local signal from an oscillator, and outputs an intermediate frequency signal; and a phase controller that extracts a first part of the local signal, sets a different phase for the first part, and outputs a second part as the reception signal, the second part having been phase-shifted; wherein, for the different phase set by the phase controller, a direct-current voltage of the intermediate frequency signal output from the frequency mixer is detected, a conversion gain of the frequency mixer is obtained, and a gain of the receiver is calculated. - View Dependent Claims (15)
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Specification