Reducing Insertion Loss in LNA Bypass Mode by Using a Single-Pole-Triple-Throw Switch in a RF Front End Module
First Claim
1. A radio frequency (RF) front end module (FEM), comprising:
- a low noise amplifier (LNA) having an input and an output; and
a single-pole-triple-throw (SPTT) switch having a common and selectable first, second and third positions, wherein the common is coupled to an antenna node, the first position is coupled to a transmitter input node, the second position is coupled to a receiver output node, and the third position is coupled to the input of the LAN.
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Abstract
A microwave radio frequency (RF) front end module (FEM) having a low noise amplifier (LNA) with a bypass mode uses a single-pole-triple-throw RF switch that reduces insertion loss to about 1 dB and thereby improves RF receiver sensitivity over existing technology two series connected single-pole-double throw RF switches. The single-pole-triple-throw RF switch may be three metal oxide semiconductor field effect transistor (MOSFET) RF switches that may be arranged with a common source input and isolated independent drain outputs. The RF switches may be single, double or triple gate MOSFET RF switches. The MOSFET RF switches may also be configured as complementary metal oxide semiconductor (CMOS) field effect transistor (FET) RF switches.
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Citations
18 Claims
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1. A radio frequency (RF) front end module (FEM), comprising:
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a low noise amplifier (LNA) having an input and an output; and a single-pole-triple-throw (SPTT) switch having a common and selectable first, second and third positions, wherein the common is coupled to an antenna node, the first position is coupled to a transmitter input node, the second position is coupled to a receiver output node, and the third position is coupled to the input of the LAN. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A radio frequency device, comprising:
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a power amplifier, an input matching circuit coupled to an input of the power amplifier and a low pass filter coupled to an output of the power amplifier; and a radio frequency (RF) front end module (FEM), comprising; a low noise amplifier (LNA) having an input and an output; and a single-pole-triple-throw (SPTT) switch having a common and selectable first, second and third positions, wherein the common is coupled to an antenna node, the first position is coupled to an output of the low pass filter, the second position is coupled to a receiver output node, and the third position is coupled to the input of the LAN. - View Dependent Claims (16, 17, 18)
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Specification