Smart transmitter system
View Patent ↗Smart transmitter system that includes apparatus for an automatic gain control circuit. The apparatus includes a circuit translates a transmit power control signal to produce a linear signal, and a first mapping circuit that maps the linear signal to a first control signal that is coupled to a variable gain amplifier (VGA). The apparatus also includes a power amplifier (PA) control circuit that receives the linear signal and a transmit signal to produce a second control signal that is coupled to a power amplifier.
1. Apparatus for providing an automatic gain control circuit, the apparatus comprising:
a circuit that translates a transmit power control signal to produce a linear signal;
a first mapping circuit that maps the linear signal to a first control signal that is coupled to a variable gain amplifier; and
a power amplifier control circuit that receives the linear signal and a transmit signal to produce a second control signal that is coupled to a linear mode power amplifier; wherein said second control signal is provided at least in part to set a minimum bias level of said linear mode power amplifier and said first control signal is provided at least in part to compensate for variations in the gain of said power amplifier.
2. The Apparatus of claim 1 , wherein the power amplifier control circuit comprises a second mapping circuit that maps the linear signal to a power control signal.
3. The Apparatus of claim 2 , wherein the power amplifier control circuit comprises a peak detector circuit that receives the transmit signal and produces a peak signal.
4. The Apparatus of claim 3 , wherein the power amplifier control circuit comprises a signal combiner that combines the peak signal and the power control signal to produce the second control signal.
5. Apparatus for providing an automatic gain control circuit, the apparatus comprising:
a circuit that translates a transmit power control signal to produce a linear signal;
a first mapping circuit that maps the linear signal to a first control signal that is coupled to a variable gain amplifier, wherein the first mapping circuit comprises a square-root circuit; and
a power amplifier control circuit that receives the linear signal and a transmit signal to produce a second control signal that is coupled to a power amplifier.
6. The Apparatus of claim 5 , wherein the power amplifier control circuit comprises a second mapping circuit that maps the linear signal to a power control signal.
7. The Apparatus of claim 6 , wherein the power amplifier control signal comprises a peak detector circuit that receives the transmit signal and produces a peak signal.
8. The Apparatus of claim 7 , wherein the power amplifier control circuit comprises a signal combiner that combines the peak signal and the power control signal to produce the second control signal.
9. Apparatus for providing an automatic gain control circuit, the apparatus comprising:
means for translating a transmit power control signal to produce a linear signal;
means for mapping the linear signal to a first control signal that is coupled to a variable gain amplifier; and
means for receiving the linear signal and a transmit signal to produce a second control signal that is coupled to a linear mode power amplifier, said second control signal provided at least in part to set a minimum bias level of said linear mode power amplifier and said first control signal is provided at least in part to compensate for variations in the gain of said power amplifier.
10. The Apparatus of claim 9 , wherein the means for receiving comprises means for mapping the linear signal to a power control signal.
11. The Apparatus of claim 10 , wherein the means for receiving comprises means for receiving the transmit signal and producing a peak signal.
12. The Apparatus of claim 11 , wherein the means for receiving comprises means for combining the peak signal and the power control signal to produce the second control signal.
13. Apparatus for providing an automatic gain control circuit, the apparatus comprising:
means for translating a transmit power control signal to produce a linear signal;
means for mapping the linear signal to a first control signal that is coupled to a variable gain amplifier, wherein the means for mapping comprises a square-root circuit; and
means for receiving the linear signal and a transmit signal to produce a second control signal that is coupled to a power amplifier.
14. The Apparatus of claim 13 , wherein the means for receiving comprises means for mapping the linear signal to a power control signal.
15. The Apparatus of claim 14 , wherein the means for receiving comprises means for receiving the transmit signal and producing a peak signal.
16. The Apparatus of claim 15 , wherein the means for receiving comprises means for combining the peak signal and the power control signal to produce the second control signal.
17. A communication device comprising apparatus for providing an automatic gain control circuit, the apparatus comprising:
a circuit that translates a transmit power control signal to produce a linear signal;
a first mapping circuit that maps the linear signal to a first control signal that is coupled to a variable gain amplifier; and
a power amplifier control circuit that receives the linear signal and a transmit signal to produce a second control signal that is coupled to a linear mode power amplifier, said second control signal provided at least in part to set a minimum bias level of said linear mode power amplifier.
18. The communication device of claim 17 , wherein the power amplifier control circuit comprises a second mapping circuit that maps the linear signal to a power control signal.
19. The communication device of claim 18 , wherein the power amplifier control circuit comprises a peak detector circuit that receives the transmit signal and produces a peak signal.
20. The communication device of claim 19 , wherein the power amplifier control circuit comprises a signal combiner that combines the peak signal and the power control signal to produce the second control signal.
21. A communication device comprising apparatus for providing an automatic gain control circuit, the apparatus comprising:
a circuit that translates a transmit power control signal to produce a linear signal;
a first mapping circuit that maps the linear signal to a first control signal that is coupled to a variable gain amplifier, wherein the first mapping circuit comprises a square-root circuit; and
a power amplifier control circuit that receives the linear signal and a transmit signal to produce a second control signal that is coupled to a power amplifier and said first control signal is provided at least in part to compensate for variations in said power amplifier gain.
22. The communication device of claim 21 , wherein the power amplifier control circuit comprises a second mapping circuit that maps the linear signal to a power control signal.
23. The communication device of claim 22 , wherein the power amplifier control circuit comprises a peak detector circuit that receives the transmit signal and produces a peak signal.
24. The communication device of claim 23 , wherein the power amplifier control circuit comprises a signal combiner that combines the peak signal and the power control signal to produce the second control signal.