RF front-end matching circuits for a transceiver module with T/R switch integrated in a transceiver chip

• US 20060135084A1
• Filed: 10/28/2005
• Published: 06/22/2006
• Est. Priority Date: 12/22/2004
• Status: Abandoned Application

• Current Assignee: Airoha Technology Corporation (MediaTek, Inc.)
• Original Assignee: Airoha Technology Corporation (MediaTek, Inc.)
• Inventors: Lee, Chien-Kuang
• Application Number:
  US11/260,135
• Publication Number:
  US 20060135084A1
• Time in Patent Office: Days
• US Class Current: 455/78
• 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
• CPC Class Codes: H04B 1/48 in circuits for connecting transmitter and receiver to a common transmission path, e.g. by energy of transmitter H04B1/46 takes precedence

Abstract

Radio frequency front-end matching circuits suitable for a transceiver module with TR switch integrated in a transceiver chip. The radio frequency front-end transceiver module comprises a radio frequency (RF) front-end device, a transmit/receive (TR) switch, a transmitter, a receiver and an internal matching circuit, in which the TR switch, the receiver, the transmitter and the matching circuit are integrated in one chip. The internal matching circuit is disposed at the first signal transmission path or the second signal transmission path selectively. The internal matching circuit is connected between the TR switch and the receiver when disposed at the first signal transmission path (receiving path) or between the TR switch and the transmitter when disposed at the second signal transmission path (transmitting path), such that the RF front-end device is impedance matched to both the receiver and the transmitter.

Claims

1. A radio frequency front-end circuit suitable for a transceiver module, comprising:

a radio frequency (RF) front-end device;

a transmit/receive (TR) switch, enabling a first signal transmission path and a second signal transmission path selectively;

a transmitter;

a receiver; and

an internal matching circuit disposed at the first signal transmission path or the second signal transmission path selectively, wherein the TR switch, the receiver, the transmitter and the internal matching circuit are integrated in one chip, the internal matching circuit is connected between the TR switch and the receiver when disposed at the first signal transmission path and between the TR switch and the transmitter when disposed at the second signal transmission path.

2. The radio frequency front-end circuit as claimed in claim 1, wherein the TR switch is connected to the RF front-end device through one pin of the chip.

3. The radio frequency front-end circuit as claimed in claim 2, wherein an input impedance of the receiver is impedance matched to an impedance of the RF front-end device when the internal matching circuit is disposed at the first signal transmission path.

4. The radio frequency front-end circuit as claimed in claim 3, wherein an output impedance of the transmitter is impedance matched to the impedance of the RF front-end device.

5. The radio frequency front-end circuit as claimed in claim 2, wherein an output impedance of the transmitter is impedance matched to an impedance of the RF front-end device when the internal matching circuit is disposed at the second signal transmission path.

6. The radio frequency front-end circuit as claimed in claim 5, wherein an input impedance of the receiver is impedance matched to the impedance of the RF front-end device.

7. The radio frequency front-end circuit as claimed in claim 2, wherein the RF front-end device comprises an antenna and an external matching circuit connected between the antenna and one pin of the chip.

8. The radio frequency front-end circuit as claimed in claim 1, wherein the transmitter comprises at least a driver amplifier.

9. The radio frequency front-end circuit as claimed in claim 1, wherein the transmitter comprises at least a power amplifier.

10. The radio frequency front-end circuit as claimed in claim 1, wherein the receiver comprises at least a low noise amplifier (LNA) and a mixer.

11. The radio frequency front-end circuit as claimed in claim 1, wherein the TR switch is a single pole dual throw (SPDT) switch or a dual pole dual throw (DPDT) switch.

12. A radio frequency front-end circuit suitable for a transceiver module, comprising:

a transmit/receive (TR) switch, enabling a first signal transmission path and a second signal transmission path selectively;

a transmitter;

a receiver;

a radio frequency (RF) front-end device; and

an internal matching circuit disposed at the first signal transmission path or the second signal transmission path selectively, wherein the TR switch, the receiver, the transmitter and the internal matching circuit are integrated in one chip, the internal matching circuit is connected between the TR switch and the receiver when disposed at the first signal transmission path and is connected between the TR switch and the transmitter when disposed at the second signal transmission path, such that an input impedance of the first signal transmission path and an output impedance of the second signal transmission path are closed and both impedance matched to the RF front-end device.

13. The radio frequency front-end circuit as claimed in claim 12, wherein the TR switch is connected to the RF front-end device through a pin of the chip.

14. The radio frequency front-end circuit as claimed in claim 13, wherein the input impedance of the first signal transmission path is impedance matched to an impedance of the RF front-end device when the internal matching circuit is disposed at the first signal transmission path.

15. The radio frequency front-end circuit as claimed in claim 14, wherein the output impedance of the second signal transmission path is impedance matched with to an impedance of the RF front-end device.

16. The radio frequency front-end circuit as claimed in claim 13, wherein the output impedance of the second signal transmission path is impedance matched to impedance of the RF front-end device when the internal matching circuit is disposed at the second signal transmission path.

17. The radio frequency front-end circuit as claimed in claim 16, wherein an input impedance of the first signal transmission path is impedance matched to the impedance of the RF front-end device.

18. The radio frequency front-end circuit as claimed in claim 13, wherein the RF front-end device comprises an antenna and an external matching circuit connected between the antenna and the pin of the chip.

19. The radio frequency front-end circuit as claimed in claim 12, wherein the transmitter comprises at least a driver amplifier.

20. The radio frequency front-end circuit as claimed in claim 12, wherein the transmitter comprises at least a power amplifier.

21. The radio frequency front-end circuit as claimed in claim 12, wherein the receiver comprises at least a low noise amplifier (LNA) and a mixer.

22. The radio frequency front-end circuit as claimed in claim 12, wherein the TR switch is a single pole dual throw (SPDT) TR switch or a dual pole dual throw (DPDT) TR switch.