Transmit-and-receive module and communication device
AssigneeMurata Manufacturing Co., Ltd.
InventorsJin Yokoyama, Shiro Masumoto, Syunji Yoshimi
Life of this patent
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Abstract
A transmit-and-receive module includes a multiplexer, a power amplifier, and a low-noise amplifier. The multiplexer includes a transmit filter and a receive filter. The power amplifier and the low-noise amplifier are integrated with each other. In a Smith chart, impedance in a receive band of the receive filter seen from a receive terminal intersects a line connecting a center point of noise figure circles and a center point of gain circles. The center point of the noise figure circles represents the impedance at which the noise figure of the low-noise amplifier is minimized. The center point of the gain circles represents the impedance at which the gain of the low-noise amplifier is maximized.
Claims12
A receive module of a communication device, the receive module comprising:
- a multiplexer comprising a common terminal, a first receive terminal, a second receive terminal, a first receive filter, and a second receive filter, the first receive filter being connected between the common terminal and the first receive terminal and the second receive filter being connected between the common terminal and the second receive filter;
- a low-noise amplifier configured to amplify a radio-frequency receive signal from the first receive terminal or from the second receive terminal;
- and
- a receive switch configured to selectively connect the first receive terminal or the second receive terminal to the low-noise amplifier, wherein:
- the multiplexer is configured to receive the radio-frequency receive signal at the common terminal and output the radio-frequency receive signal from the first receive terminal or the second receive terminal, and
- a pass band of the first receive filter is a receive band of the radio-frequency receive signal.
A receive module comprising:
- a bandpass filter;
- and
- an adjusting circuit and a low-noise amplifier connected in series with the bandpass filter,
- wherein as graphed on a Smith chart, an impedance of the bandpass filter intersects a center point of noise figure circles at which a noise figure of the low-noise amplifier is minimized, and a center point of gain circles at which a gain of the low-noise amplifier is maximized.
Dependencies are inferred from the claim text.