FRONT-END CIRCUIT OF THE WIRELESS TRANSCEIVER

• US 20090115549A1
• Filed: 11/05/2008
• Published: 05/07/2009
• Est. Priority Date: 11/07/2007
• Status: Active Grant

• Current Assignee: Airoha Technology Corporation (MediaTek, Inc.)
• Original Assignee: Airoha Technology Corporation (MediaTek, Inc.)
• Inventors: Lee, Chien-Kuang
• Granted Patent: US 8,022,786 B2
• Time in Patent Office: Days
• US Class Current: 333/101
• CPC Class Codes: H04B 1/18 Input circuits, e.g. for coupling to an antenna or a transmission line coupling networks between antennas or lines and receivers independent of the nature of the receiver H03H

Abstract

A front-end circuit of the wireless transceiver is disclosed to reduce the number of the pin count of the chip, and achieve the impedance matching. The circuit comprises an antenna unit, a receiver, and a transmitting block, all of which are connected together, wherein there is no switch provided between the receiver and the antenna unit, such that the loss of switch can be avoided for reducing the noise figure and improve the sensitivity of the receiving path accordingly.

Claims

1. A front-end circuit of the wireless transceiver, comprising:

an antenna unit, comprising an antenna and a first impedance matching circuit;

a receiver, connected to said antenna unit; and

a transmitting block, connected to said antenna unit and said receiver, comprising a transmitter and a first switch, wherein said receiver and said transmitting block are integrated within a single chip.

2. The front-end circuit of claim 1, wherein said transmitting block further comprises a second impedance matching circuit, thereby, the impedance matching between said antenna unit and said transmitting block or between said antenna unit and said receiver can be achieved.

3. The front-end circuit of claim 2, wherein said transmitter is connected to said antenna unit through said first switch and said second impedance matching circuit in turn.

4. The front-end circuit of claim 2, wherein said transmitter is connected to said antenna unit through said second impedance matching circuit and said first switch in turn.

5. The front-end circuit of claim 2, wherein the number of said antenna unit is two, wherein said antenna units are connected to said transmitting block and said receiver through a second switch respectively.

6. The front-end circuit of claim 5, wherein said antenna unit comprises a first antenna unit and a second antenna unit.

7. The front-end circuit of claim 6, wherein said first antenna unit and said second antenna unit are connected to said transmitting block and said receiver through said second switch.

8. The front-end circuit of claim 2, wherein said first switch is a differential switch and comprises a first sub-switch and a second sub-switch.

9. A front-end circuit of the wireless transceiver, comprising:

an antenna unit, comprising an antenna and a first impedance matching circuit;

a transmitter, connected to said antenna unit; and

a receiving block, connected to said antenna unit and said transmitter, comprising a receiver and a first switch, wherein said receiving block and said transmitter are integrated within a single chip.

10. The front-end circuit of claim 9, wherein said receiving block further comprises a second impedance circuit, thereby, the impedance matching between said antenna unit and said transmitter or between said antenna unit and said receiving block can be achieved.

11. The front-end circuit of claim 10, wherein said receiver is connected to said antenna unit through said first switch and said second impedance matching circuit in turn.

12. The front-end circuit of claim 10, wherein said receiver is connected to said antenna unit through said second impedance matching circuit and said first switch in turn.

13. The front-end circuit of claim 10, wherein the number of said antenna unit is two, wherein said antenna units are connected to said transmitter and said receiving block through a second switch respectively.

14. The front-end circuit of claim 13, wherein said antenna unit comprises a first antenna unit and a second antenna unit.

15. The front-end circuit of claim 14, wherein said first antenna unit and said second antenna unit are connected to said transmitter and said receiving block through said second switch.

16. The front-end circuit of claim 10, wherein said first switch is a differential switch and comprises a first sub-switch and a second sub-switch.