Wireless receiver having improved phase shifting schemes with reduced number of phase shifters
View Patent ↗A wireless receiver includes an antenna receiving a right-handed circularly polarized (RHCP) signal and a left-handed circularly polarized (LHCP) signal, a first amplifier and a second amplifier coupled to the antenna, an intermediate summer coupled to the first and second amplifiers and providing a first intermediate signal, an intermediate subtractor coupled to the first and second amplifiers and providing a second intermediate signal. The wireless receiver also includes a V-signal summer providing a V-component output based on a sum of the first intermediate signal and the second intermediate signal, and an H-signal subtractor providing an H-component output based on a difference between the first intermediate signal and the second intermediate signal. The wireless receiver is configured to provide the V-component output and the H-component output without using a phase shifter.
1. A wireless receiver comprising:
an antenna receiving a right-handed circularly polarized (RHCP) signal and a left-handed circularly polarized (LHCP) signal;
a first amplifier and a second amplifier coupled to said antenna;
an intermediate summer coupled to said first and second amplifiers, and providing a first intermediate signal;
an intermediate subtractor coupled to said first and second amplifiers, and providing a second intermediate signal;
a V-signal summer providing a V-component output based on a sum of said first intermediate signal and said second intermediate signal;
an H-signal subtractor providing an H-component output based on a difference between said first intermediate signal and said second intermediate signal.
2. The wireless receiver of claim 1 wherein said wireless receiver is configured to provide said V-component output and said H-component output without using a phase shifter.
3. The wireless receiver of claim 1 wherein said first amplifier is a variable gain amplifier with a first gain.
4. The wireless receiver of claim 1 wherein said antenna is directly coupled to said first amplifier without using a phase shifter.
5. The wireless receiver of claim 1 wherein said second amplifier is a variable gain amplifier with a second gain.
6. The wireless receiver of claim 1 wherein said antenna is directly coupled to said second amplifier without using a phase shifter.
7. The wireless receiver of claim 1 wherein said wireless receiver is configured to provide said V-component output and said H-component output without using a 90-degree phase shifter.
8. A wireless receiver comprising:
an antenna receiving a right-handed circularly polarized (RHCP) signal and a left-handed circularly polarized (LHCP) signal;
a first amplifier and a second amplifier coupled to said antenna;
an intermediate summer coupled to said first and second amplifiers, and providing a first intermediate signal;
a third amplifier and a fourth amplifier coupled to said antenna;
an intermediate subtractor coupled to said third and fourth amplifiers, and providing a second intermediate signal;
a V-signal summer providing a V-component output based on a sum of said first intermediate signal and said second intermediate signal;
an H-signal subtractor providing an H-component output based on a difference between said first intermediate signal and said second intermediate signal.
9. The wireless receiver of claim 8 wherein said wireless receiver is configured to provide said V-component output and said H-component output without using a phase shifter.
10. The wireless receiver of claim 8 wherein said first amplifier and said third amplifier are variable gain amplifiers with a first gain.
11. The wireless receiver of claim 8 wherein said second amplifier and said fourth amplifier are variable gain amplifiers with a second gain.
12. The wireless receiver of claim 8 wherein said antenna is directly coupled to each of said first, second, third and fourth amplifiers without using a phase shifter.
13. The wireless receiver of claim 8 wherein said wireless receiver is configured to provide said V-component output and said H-component output without using a 90-degree phase shifter.
14. A wireless receiver comprising:
an antenna receiving a right-handed circularly polarized (RHCP) signal and a left-handed circularly polarized (LHCP) signal;
a first amplifier and a second amplifier coupled to said antenna;
a first intermediate signal produced based on outputs of said first and second amplifiers;
a second intermediate signal produced based on said outputs of said first and second amplifiers;
a V-signal summer providing a V-component output based on a sum of said first intermediate signal and said second intermediate signal;
an H-signal subtractor providing an H-component output based on a difference between said first intermediate signal and said second intermediate signal.
15. The wireless receiver of claim 14 wherein said wireless receiver is configured to provide said V-component output and said H-component output without using a phase shifter.
16. The wireless receiver of claim 14 wherein said first amplifier is a variable gain amplifier with a first gain.
17. The wireless receiver of claim 14 wherein said antenna is directly coupled to said first amplifier without using a phase shifter.
18. The wireless receiver of claim 14 wherein said second amplifier is a variable gain amplifier with a second gain.
19. The wireless receiver of claim 14 wherein said antenna is directly coupled to said second amplifier without using a phase shifter.
20. The wireless receiver of claim 14 wherein said wireless receiver is configured to provide said V-component output and said H-component output without using a 90-degree phase shifter.