Diversity receiver front end system with amplifier phase compensation
Diversity receiver front end system with amplifier phase compensation. A receiving system can include a first amplifier disposed along a first path, corresponding to a first frequency band, between an input of the receiving system and an output of the receiving system. The receiving system can include a second amplifier disposed along a second path, corresponding to a second frequency band, between the input of the receiving system and the output of the receiving system. The receiving system can include a first phase-shift component disposed along the first path and configured to phase-shift the second frequency band of a signal passing through the first phase-shift component based on a phase-shift caused by the first amplifier at the second frequency band.
1. A receiving system comprising:
a first amplifier disposed along a first path, corresponding to a first frequency band, between an input of the receiving system and an output of the receiving system;
a second amplifier disposed along a second path, corresponding to a second frequency band, between the input of the receiving system and the output of the receiving system; and
a first phase-shift component disposed along the first path and configured to phase-shift the second frequency band of a signal passing through the first phase-shift component based on a phase-shift caused by the first amplifier at the second frequency band.
2. The receiving system of claim 1 further comprising a second phase-shift component disposed along the second path and configured to phase-shift the first frequency band of a signal passing through the second phase-shift component based on a phase-shift caused by the second amplifier at the first frequency band.
3. The receiving system of claim 1 wherein the first phase-shift component is further configured to phase-shift a third frequency band of the signal passing through the first phase-shift component based on a phase-shift caused by the first amplifier at the third frequency band.
4. The receiving system of claim 1 wherein the first phase-shift component is configured to phase-shift the second frequency band of the signal passing through the first phase-shift component based on a phase-shift caused by reverse propagation through the first amplifier and forward propagation through the first amplifier.
5. The receiving system of claim 1 further comprising a multiplexer configured to split an input signal received at the input of the receiving system into a first signal at a first frequency band propagated along the first path and a second signal at a second frequency band propagated along the second path.
6. The receiving system of claim 5 wherein the first phase-shift component is configured to phase-shift the second frequency band of the signal passing through the first phase-shift component further based on a phase-shift caused by the multiplexer at the second frequency band.
7. The receiving system of claim 5 wherein the first phase-shift component is integrated into a first impedance matching component disposed between the multiplexer and the first amplifier.
8. The receiving system of claim 7 wherein the first impedance matching component has an impedance selected based on the first frequency band to reduce at least one of a noise figure of the first path for the first frequency band or increase a gain of the first path for the first frequency band.
9. The receiving system of claim 8 wherein the first impedance matching component has an impedance selected based on the second frequency band to reduce at least one of a noise figure of the first path for the second frequency band or a gain of the first path for the second frequency band.
10. The receiving system of claim 5 further comprising a signal combiner configured to combine the first signal and the second signal.
11. The receiving system of claim 10 wherein first phase-shift component is disposed between the signal combiner and the first amplifier.
12. The receiving system of claim 1 wherein the first phase-shift component is configured to phase-shift the second frequency band of the signal passing through the first phase-shift component such that an initial signal propagated along the second path and a reflected signal propagated along the first path are at least partially in-phase.
13. The receiving system of claim 12 wherein the first phase-shift component is configured to phase-shift the second frequency band of the signal passing through the first phase-shift component such that such that an amplitude of a sum of initial signal and the reflected signal is greater than an amplitude of the initial signal.
14. The receiving system of claim 12 wherein the first phase-shift component is configured to phase-shift the second frequency band of the signal passing through the first phase-shift component such that the initial signal and the reflected signal have a phase difference of an integer multiple of 360 degrees.
15. The receiving system of claim 1 wherein the first phase-shift component is a tunable phase-shift component configured to phase-shift the second frequency band of the signal passing through the first phase-shift component an amount controlled by a phase-shift tuning signal received from a controller.
16. The receiving system of claim 1 wherein the first phase-shift component is a passive circuit.
17. A radio-frequency (RF) module comprising:
a packaging substrate configured to receive a plurality of components; and
a receiving system implemented on the packaging substrate, the receiving system including a first amplifier disposed along a first path, corresponding to a first frequency band, between an input of the receiving system and an output of the receiving system, a second amplifier disposed along a second path, corresponding to a second frequency band, between the input of the receiving system and the output of the receiving system, and a first phase-shift component disposed along the first path and configured to phase-shift the second frequency band of a signal passing through the first phase-shift component based on a phase-shift caused by the first amplifier at the second frequency band.
18. The RF module of claim 17 wherein the RF module is a diversity receiver front-end module (FEM).
19. A wireless device comprising:
a first antenna configured to receive a first radio-frequency (RF) signal;
a first front-end module (FEM) in communication with the first antenna, the first FEM including a packaging substrate configured to receive a plurality of components, the first FEM further including a receiving system implemented on the packaging substrate, the receiving system including a first amplifier disposed along a first path, corresponding to a first frequency band, between an input of the receiving system and an output of the receiving system, a second amplifier disposed along a second path, corresponding to a second frequency band, between the input of the receiving system and the output of the receiving system, and a first phase-shift component disposed along the first path and configured to phase-shift the second frequency band of a signal passing through the first phase-shift component based on a phase-shift caused by the first amplifier at the second frequency band; and
a transceiver configured to receive a processed version of the first RF signal from an output of the first FEM module via a transmission line and generate data bits based on the processed version of the first RF signal.
20. The wireless device of claim 19 further comprising a second antenna configured to receive a second radio-frequency (RF) signal and a second FEM in communication with the second antenna, the transceiver being configured to receive a processed version of the second RF signal from an output of the second FEM and generate the data bits based on the processed version of the second RF signal.