Wireless communication system using a single trace for transmitting signals

• US 7,551,684 B2
• Filed: 03/20/2006
• Issued: 06/23/2009
• Est. Priority Date: 02/15/2006
• Status: Active Grant

• Current Assignee: Wistron NeWeb Corporation (Wistron Corporation)
• Original Assignee: Wistron NeWeb Corporation (Wistron Corporation)
• Inventors: Chen, Chun-Chao, Lin, Kuo-Lung, Chen, Pei-Chi, Hsu, Cheng-Hsiung, Huang, Chen-Chia
• Primary Examiner(s): Payne; David C
• Assistant Examiner(s): Shah; Tanmay K
• Application Number:
  US11/277,034
• Publication Number:
  US 20070189413A1
• Time in Patent Office: 1,191 Days
• Field of Search: 375/295, 455/574
• US Class Current: 375/295
• CPC Class Codes: H03F 1/34 Negative-feedback-circuit arrangements with or without positive feedback H03F1/02 - H03F1/30, H03F1/38 - H03F1/50, H03F3/50 take precedence ; for rejection of common mode signals H03F3/45479
• CPC Class Codes: H03F 2200/417 A switch coupled in the output circuit of an amplifier being controlled by a circuit
• CPC Class Codes: H03F 2200/451 the amplifier being a radio frequency amplifier
• CPC Class Codes: H03F 2200/75 the amplifier stage being a common source configuration MOSFET
• CPC Class Codes: H03F 3/19 with semiconductor devices only
• CPC Class Codes: H04B 1/04 Circuits

Abstract

A wireless communication system includes an antenna, a receiving module, a power source, and a power control hub. The power control hub includes an amplifier having a first end coupled to the receiving module and a second end coupled to the power source. The amplifier generates a first output signal based on a control signal of the receiving module. The power control hub includes a rectifier having a first end coupled to the output end of the amplifier and a second end coupled to the power source. The rectifier generates a second output signal based on the first output signal. The power control hub also includes a switch. A first and a second end of the switch are electrically connected or disconnected based on the second output signal received at a control end of the switch.

Claims

1. A wireless communication system using a single trace for transmitting signals comprising:

an antenna for generating radio frequency (RF) signals;

a receiving module having a signal generator for generating control signals;

a power source for generating direct current (DC) signals for supplying power to the antenna and the receiving module; and

a power control hub coupled to the antenna, the receiving module and the power source, the power control hub comprising;

an amplifier comprising;

a first end coupled to the signal generator of the receiving module for receiving the control signals generated by the signal generator;

a second end coupled to the power source; and

an output end for outputting first output signals generated by amplifying the control signals;

a rectifier comprising;

a first end coupled to the output end of the amplifier;

a second end coupled to the power source; and

an output end for outputting second output signals generated by adjusting DC levels of the first output signals received from the output end of the amplifier; and

a switch comprising;

a first end coupled to the power source;

a second end coupled to the antenna; and

a control end coupled to the output end of the rectifier for electrically connecting or disconnecting the first and second ends of the switch based on the second output signals received from the output end of the rectifier.

2. The wireless communication system of claim 1 further comprising:

a first inductor coupled between the power source and the first end of the amplifier for providing passages for the DC signals generated by the power source;

a second inductor coupled between the first end of the amplifier and the receiving module for providing passages for the DC signals generated by the power source and the control signals generated by the signal generator, and for blocking the RF signals sent by the antenna;

a third inductor coupled between the second end of the switch and the antenna for providing passages for the DC signals generated by the power source and for blocking the RF signals sent by the antenna;

a first capacitor coupled between the power source and ground for blocking the control signals generated by the signal generator; and

a second capacitor coupled between the receiving module and the antenna for providing passages for the RF signals sent by the antenna, and for blocking the DC signals generated by the power source and the control signals generated by the signal generator.

3. The wireless communication system of claim 2 further comprising:

a first resistor having a first end coupled between the first and second inductors for adjusting voltage levels of the control signals; and

a third capacitor coupled between a second end of the first resistor and the first end of the amplifier for blocking the DC signals generated by the power source.

4. The wireless communication system of claim 1 wherein the amplifier comprises:

a transistor having a control end coupled to the first end of the amplifier;

a first bias resistor coupled between the power source and a first end of the transistor;

a second bias resistor coupled between the control end and the first end of the transistor;

a ground resistor coupled between a second end of the transistor and ground; and

a gain capacitor coupled between the second end of the transistor and ground and in parallel with the ground resistor for increasing the amount of gain provided by the transistor when amplifying the control signals.

5. The wireless communication system of claim 4 wherein the transistor includes a bipolar junction transistor (BJT) or a metal-oxide-semiconductor field effect transistor (MOSFET).

6. The wireless communication system of claim 1 wherein the rectifier comprises:

a first charging capacitor coupled between the first and second ends of the rectifier;

a resistor coupled between the second and output ends of the rectifier;

a first diode having an anode coupled to the first end of the rectifier and a cathode coupled to the second end of the rectifier;

a second diode having an anode coupled to the output end of the rectifier and a cathode coupled to the anode of the first diode; and

a ground capacitor coupled between the output end of the rectifier and ground.

7. The wireless communication system of claim 6 wherein the rectifier further comprises:

a second charging capacitor coupled between the first end of the rectifier and the cathode of the second diode.

8. The wireless communication system of claim 1 wherein the rectifier comprises:

a resistor coupled between the second and output ends of the rectifier;

a first diode having a cathode coupled to the second end of the rectifier;

a second diode having an anode coupled to the output end of the rectifier and a cathode coupled to the anode of the first diode;

a charging capacitor coupled between the first end of the rectifier and the cathode of the second diode; and

a ground capacitor coupled between the output end of the rectifier and ground.

9. The wireless communication system of claim 1 wherein the rectifier comprises:

a resistor coupled between the output end of the rectifier and ground;

a ground capacitor coupled between the output end of the rectifier and ground;

a first diode having an anode coupled to the first end of the rectifier and a cathode coupled to ground;

a second diode having an anode coupled to the output end of the rectifier and a cathode coupled to the anode of the first diode; and

a first charging capacitor coupled between the first end of the rectifier and the cathode of the second diode.

10. The wireless communication system of claim 9 wherein the rectifier further comprises:

a second charging capacitor coupled between the first and second ends of the rectifier.

11. The wireless communication system of claim 1 wherein the rectifier comprises:

a resistor coupled between the output end of the rectifier and ground;

a ground capacitor coupled between the output end of the rectifier and ground;

a first diode having an anode coupled to the first end of the rectifier and a cathode coupled to ground;

a second diode having an anode coupled to the output end of the rectifier and a cathode coupled to the anode of the first diode; and

a charging capacitor coupled between the first and second ends of the rectifier.

12. The wireless communication system of claim 1 wherein the switch includes a MOSFET.

13. The wireless communication system of claim 1 wherein the receiving module includes a satellite radio.