Wireless transceiver using shared filters for receive, transmit and calibration modes

• US 8,204,451 B1
• Filed: 07/30/2008
• Issued: 06/19/2012
• Est. Priority Date: 09/17/2007
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm Atheros Incorporated (Qualcomm, Inc.)
• Inventors: Samavati, Hirad, Mehta, Srenik, Su, David, Kheirkhahi, Alireza, Kaczynski, Brian
• Primary Examiner(s): Dao, Minh D
• Application Number:
  US12/182,232
• Time in Patent Office: 1,420 Days
• Field of Search: 455/84, 455/83, 455/82, 455/213, 455/306, 455/307, 455/339, 455/67.11, 455/115.1, 455/226.1, 370/280, 375/232
• US Class Current: 455/84
• CPC Class Codes: H03B 2201/025 the means being an electronic switch for switching in or out oscillator elements
• CPC Class Codes: H03B 5/1212 the amplifier comprising a pair of transistors, wherein an output terminal of each being connected to an input terminal of the other, e.g. a cross coupled pair
• CPC Class Codes: H03B 5/1228 the amplifier comprising one or more field effect transistors
• CPC Class Codes: H03B 5/1253 the transistors being field-effect transistors
• CPC Class Codes: H03B 5/1265 switched capacitors
• CPC Class Codes: H03J 2200/10 Tuning of a resonator by means of digitally controlled capacitor bank
• CPC Class Codes: H03L 7/099 concerning mainly the controlled oscillator of the loop

Abstract

A transceiver for use in a wireless device. The transceiver may include a receive portion for receiving an input RF signal. The receive portion may include at least one receive filter which may include a first filter. The transceiver may also include a transmit portion for transmitting an output RF signal. The transmit portion may include at least one transmit filter, which may include the first filter used in the receive portion. The transceiver may further include a plurality of switches, which may include a first switch coupled to an input of the first filter and a second switch coupled to an output of the first filter. The plurality of switches may be configurable to enable use of the first filter in the receive portion for receiving the input RF signal and use of the first filter in the transmit portion for transmitting the output RF signal.

Claims

1. A transceiver, comprising:

a receive portion for receiving an input RF signal, wherein the receive portion comprises at least one receive filter, wherein the at least one receive filter comprises a first filter;

a transmit portion for transmitting an output RF signal, wherein the transmit portion comprises at least one transmit filter, wherein the at least one transmit filter comprises the first filter used in the receive portion;

a plurality of switches, comprising at least one first switch coupled to an input of the first filter and a second switch coupled to an output of the first filter;

wherein the plurality of switches are configurable to enable

     1) use of the first filter in the receive portion for receiving the input RF signal;

     2) use of the first filter in the transmit portion for transmitting the output RF signal; and

     3) use of the first filter in a calibration mode for calibrating the at least one receive filter and/or the at least one transmit filter.

2. The transceiver of claim 1,

wherein the at least one receive filter comprises the first filter and a second filter;

wherein the plurality of switches are further configurable to enable use of the first filter and the second filter in the calibration mode for calibrating the at least one receive filter and/or the at least one transmit filter.

3. The transceiver of claim 1,

wherein the plurality of switches are further configurable to enable 4) use of the first filter in a carrier leak calibration mode, wherein, in the carrier leak calibration mode, the plurality of switches are configurable to form a path comprising portions of each of the receive portion and the transmit portion.

4. The transceiver of claim 3, wherein the plurality of switches comprise a third switch which is configurable, in the leak configuration mode, to bypass the first filter of the at least one transmit filter.

5. The transceiver of claim 1, wherein the transceiver is comprised in a wireless router.

6. A method for operating a transceiver in a wireless device, comprising:

configuring the transceiver to transmit output RF signals, wherein said configuring the transceiver to transmit output RF signals comprises configuring a plurality of switches to form a transmit pathway for transmitting the output RF signals, wherein the transmit pathway comprises at least one transmit filter comprising a first filter;

transmitting the output RF signals using the transmit pathway;

configuring the transceiver to receive input RF signals, wherein said configuring the transceiver to receive input RF signals comprises configuring the plurality of switches to form a receive pathway for receiving the input RF signals, wherein the receive pathway comprises at least one receive filter, wherein the at least one receive filter comprises the first filter used in the transmit pathway; and

receiving the input RF signals using the receive pathway;

configuring the transceiver to perform a first calibration, wherein said configuring the transceiver to perform the first calibration comprises configuring the plurality of switches to form a first calibration pathway to perform the first calibration, wherein the first calibration pathway comprises the at least one transmit filter and the at least one receive filter; and

performing the first calibration using the first calibration pathway.

7. The method of claim 6, wherein said performing the first calibration comprises calibrating the first filter.

8. The method of claim 6, further comprising:

configuring the transceiver to perform a carrier leak calibration, wherein said configuring the transceiver to perform the carrier leak calibration comprises configuring the plurality of switches to form a carrier leak calibration pathway to perform the carrier leak calibration, wherein the carrier leak calibration pathway comprises the at least one transmit filter and the at least one receive filter; and

performing the carrier leak calibration using the carrier leak calibration pathway.

9. The method of claim 6, wherein the plurality of switches comprise:

a first and second switch coupled to the input of the first filter; and

a third switch coupled to the output of the first filter.

10. The method of claim 9, wherein the plurality of switches comprise a fourth switch configurable to bypass the first filter in the receive pathway, and wherein the method further comprises:

enabling the fourth switch to perform a carrier leak calibration of the transceiver.

11. The method of claim 6,

wherein the transmit pathway comprises:

a digital to analog converter (DAC);

the at least one transmit filter coupled to an output of the DAC;

a transmit mixer stage coupled to an output of the at least one transmit filter for mixing the output of the at least one transmit filter with a mixing signal;

a power amplifier coupled to an output of the transmit mixer stage for generating the output RF signals; and

wherein the receive pathway comprises;

an input stage for receiving the input RF signals;

a receive mixer stage for mixing the input RF signals with a mixing signal;

the at least one receive filter coupled to an output of the mixer stage;

an analog to digital converter (ADC) coupled to an output of the at least one receive filter.

12. A transceiver, comprising:

a receive portion comprising;

an input stage for receiving an input RF signal;

a receive mixer stage for mixing the RF signal with a mixing signal;

at least one receive filter coupled to an output of the mixer stage, wherein the at least one filter comprises a first filter;

an analog to digital converter (ADC) coupled to an output of the at least one receive filter;

a transmit portion comprising;

a digital to analog converter (DAC);

at least one transmit filter coupled to an output of the DAC, wherein the at least one transmit filter comprises the first filter used in the receive portion;

a transmit mixer stage coupled to an output of the at least one transmit filter for mixing the output of the at least one transmit filter with a mixing signal;

a power amplifier coupled to an output of the transmit mixer stage for generating an output RF signal;

a plurality of switches, comprising a first switch coupled to an input of the first filter and a second switch coupled to an output of the first filter;

wherein the switches are configurable to enable

     1) use of the first filter in the receive portion for receiving the input RF signal;

     2) use of the first filter in the transmit portion for transmitting the output RF signal; and

     3) use of the first filter in a calibration mode for calibrating the at least one receive filter and/or the at least one transmit filter.

13. The transceiver of claim 12,

wherein the plurality of switches are further configurable to enable 4) use of the first filter in a carrier leak calibration mode, wherein, in the carrier leak calibration mode, the plurality of switches are configurable to form a path comprising portions of each of the receive portion and the transmit portion.

14. The transceiver of claim 13, wherein the plurality of switches comprise a third switch which is configurable, in the leak configuration mode, to bypass the first filter of the at least one transmit filter.

15. The transceiver of claim 12, wherein the transceiver is comprised in a wireless router.

16. A transceiver, comprising:

an input stage for receiving an input RF signal;

a receive mixer stage for mixing the RF signal with a mixing signal;

at least one receive filter coupled to an output of the mixer stage, wherein the at least one filter comprises a first filter;

an analog to digital converter (ADC) coupled to an output of the one or more second filters;

wherein the input stage, the receiver mixer stage, the at least one receive filter, and the ADC compose a receive path of the transceiver;

a digital to analog converter (DAC);

at least one transmit filter coupled to an output of the DAC, wherein the at least one filter comprises the first filter;

a transmit mixer stage coupled to an output of the at least one transmit filter for mixing the output of the at least one transmit filter with a mixing signal;

a power amplifier coupled to an output of the transmit mixer stage;

wherein the DAC, the at least one transmit filter, the transmit mixer stage, and the power amplifier compose a transmit path of the transceiver;

a plurality of switches, comprising a first switch coupled to an input of the first filter and a second switch coupled to an output of the first filter;

wherein the switches are configurable to enable

     1) use of the first filter in the receive path for receiving the input RF signal;

     2) use of the first filter in the transmit path for transmitting an output RF signal; and

     3) use of the first filter in a calibration mode for calibrating the at least one receive filter and/or the at least one transmit filter.