SAW-less receiver including an if frequency translated BPF

• US 9,002,295 B2
• Filed: 09/16/2013
• Issued: 04/07/2015
• Est. Priority Date: 06/03/2010
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Mirzaei, Ahmad, Darabi, Hooman
• Primary Examiner(s): Pham, Tuan
• Application Number:
  US14/028,161
• Publication Number:
  US 20140016729A1
• Time in Patent Office: 568 Days
• Field of Search: 455/501, 455/63.1, 455/73, 455/77, 455/87, 455/130, 455/131, 455/213, 455/249.1, 455/296, 455/306, 455/307, 455/333, 455/339
• US Class Current: 455/73
• CPC Class Codes: H03H 19/002 N-path filters
• CPC Class Codes: H04L 27/06 Demodulator circuits; Receiver circuits
• CPC Class Codes: H04L 27/34 Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems

Abstract

A SAW-less receiver includes an FEM interface module, an RF to IF receiver section, and a receiver IF to baseband section. The RF to IF receiver section includes a mixing module, a mixed buffer section, and a frequency translated BPF (FTBPF) circuit module. The mixing module converts an inbound RF signal into an in-phase (I) mixed signal and a quadrature (Q) mixed signal. The mixed buffer section filters and buffers the I mixed signal and filter and buffer the Q mixed signal. The FTBPF circuit module frequency translates a baseband filter response to an IF filter response such that the FTBPF circuit module filters undesired signal components of the IF I signal and the IF Q signal to produce an inbound IF signal. The receiver IF to baseband section converts the inbound IF signal into one or more inbound symbol streams.

Claims

1. A surface acoustic wave (SAW)-less transceiver comprising:

a front end module (FEM) interface module configured to receive an inbound radio frequency (RF) signal;

an RF to intermediate frequency (IF) receiver section configured to;

down-convert the inbound RF signal into an inbound IF signal;

filter the inbound IF signal to produce a filtered inbound IF signal by;

utilizing a first baseband filter response to filter the inbound IF signal during a first clock interval of an IF clock;

utilizing a second baseband filter response to filter the inbound IF signal during a second clock interval of the IF clock;

utilizing an inverse first baseband filter response to filter the inbound IF signal during a third clock interval of the IF clock; and

utilizing an inverse second baseband filter response to filter the inbound IF signal during a fourth clock interval of the IF clock; and

a receiver IF to baseband section configured to convert the filtered inbound IF signal into one or more inbound symbol streams.

2. The SAW-less transceiver of claim 1, wherein the FEM interface module comprises:

a transformer configured to receive an RF signal to produce a received RF signal;

a tunable capacitor network configured to filter the received RF signal to produce a filtered RF signal; and

a low noise amplifier module (LNA) configured to amplify the filtered RF signal to produce the inbound RF signal.

3. The SAW-less transceiver of claim 1, wherein the RF to IF receiver section down-converts the inbound RF signal into the inbound IF signal by:

converting the inbound RF signal into an in-phase (I) signal component and a quadrature (Q) signal component;

mixing the I signal component with an I signal component of a local oscillation to produce an I mixed signal; and

mixing the Q signal component with a Q signal component of the local oscillation to produce a Q mixed signal; and

filtering the I and Q mixed signals to produce the inbound IF signal.

4. The SAW-less transceiver of claim 3, wherein the RF to IF receiver section is configured to filter the I and Q mixed signals by:

attenuating a frequency sum component of the I mixed signal and passing a frequency difference component of the I mixed signal as an IF I signal component of the inbound IF signal; and

attenuating a frequency sum component of the Q mixed signal and passing a frequency difference component of the Q mixed signal as an IF Q signal component of the inbound IF signal.

5. The SAW-less transceiver of claim 1, wherein the RF to IF receiver section down-converting the inbound RF signal into the inbound IF signal further comprising:

attenuating an undesired signal component of an IF I signal of the inbound IF signal; and

attenuating an undesired signal component of an IF Q signal of the inbound IF signal.

6. The SAW-less transceiver of claim 1, further comprising a front end module configured to isolate the inbound RF signal from an undesired RF signal.

7. The SAW-less transceiver of claim 1, wherein the RF to IF receiver section is further configured to alter a baseband filter response by:

receiving a control signal; and

based on the control signal, adjusting one or more of;

a center frequency of the baseband filter response, a quality factor of the baseband filter response, a gain of the baseband filter response, a bandwidth of the baseband filter response, and an attenuation slope of the baseband filter response.

18. The SAW-less transceiver of claim 1, wherein the inbound RF signal comprises one of a cellular RF signal, a Wireless Local Area Network signal, a Wireless Personal Area Network signal, and a millimeter wave signal.

8. A method of operating a surface acoustic wave (SAW)-less transceiver comprising:

receiving an inbound radio frequency (RF) signal;

down-converting the inbound RF signal into an inbound IF signal;

filtering the inbound IF signal to produce a filtered inbound IF signal by;

utilizing a first baseband filter response to filter the inbound IF signal during a first clock interval of an IF clock;

utilizing a second baseband filter response to filter the inbound IF signal during a second clock interval of the IF clock;

utilizing an inverse first baseband filter response to filter the inbound IF signal during a third clock interval of the IF clock; and

utilizing an inverse second baseband filter response to filter the inbound IF signal during a fourth clock interval of the IF clock; and

converting the filtered inbound IF signal into one or more inbound symbol streams.

9. The method of claim 8, further comprising:

receiving an RF signal;

filtering the received RF signal to produce a filtered RF signal; and

amplifying the filtered RF signal to produce the inbound RF signal.

10. The method of claim 8, wherein down-converting the inbound RF signal into an inbound IF signal comprises:

converting the inbound RF signal into an in-phase (I) signal component and a quadrature (Q) signal component;

mixing the I signal component with an I signal component of a local oscillation to produce an I mixed signal; and

mixing the Q signal component with a Q signal component of the local oscillation to produce a Q mixed signal; and

filtering the I and Q mixed signals to produce the inbound IF signal.

11. The method of claim 10, wherein filtering the I and Q mixed signals comprises:

attenuating a frequency sum component of the I mixed signal and passing a frequency difference component of the I mixed signal as an IF I signal component of the inbound IF signal; and

attenuating a frequency sum component of the Q mixed signal and passing a frequency difference component of the Q mixed signal as an IF Q signal component of the inbound IF signal.

12. The method of claim 8, wherein down-converting the inbound RF signal into the inbound IF signal further comprises:

attenuating an undesired signal component of an IF I signal of the inbound IF signal; and

attenuating an undesired signal component of an IF Q signal of the inbound IF signal.

13. The method of claim 8, further comprising isolating the inbound RF signal from an undesired RF signal.

14. The method of claim 8, further comprising:

receiving a control signal; and

based on the control signal, adjusting one or more of;

a center frequency of a baseband filter response, a quality factor of the baseband filter response, a gain of the baseband filter response, a bandwidth of the baseband filter response, and an attenuation slope of the baseband filter response.

19. The method of claim 8, wherein the inbound RF signal comprises one of a cellular RF signal, a Wireless Local Area Network signal, a Wireless Personal Area Network signal, and a millimeter wave signal.

15. A surface acoustic wave (SAW)-less transceiver comprising:

a transmitter section; and

a receiver section comprising;

a front end module (FEM) interface module configured to receive an inbound radio frequency (RF) signal;

an RF to intermediate frequency (IF) receiver section configured to;

down-convert the inbound RF signal into an inbound IF signal;

filter the inbound IF signal to produce a filtered inbound IF signal by;

utilizing a first baseband filter response to filter the inbound IF signal during a first clock interval of an IF clock;

utilizing a second baseband filter response to filter the inbound IF signal during a second clock interval of the IF clock;

utilizing an inverse first baseband filter response to filter the inbound IF signal during a third clock interval of the IF clock; and

utilizing an inverse second baseband filter response to filter the inbound IF signal during a fourth clock interval of the IF clock; and

a receiver IF to baseband section configured to convert the filtered inbound IF signal into one or more inbound symbol streams.

16. The SAW-less transceiver of claim 15, wherein the FEM interface module comprises:

a transformer configured to receive an RF signal to produce a received RF signal;

a tunable capacitor network configured to filter the received RF signal to produce a filtered RF signal; and

a low noise amplifier module (LNA) configured to amplify the filtered RF signal to produce the inbound RF signal.

17. The SAW-less transceiver of claim 15, wherein the RF to IF receiver section is further configured alter a baseband filter response by:

receiving a control signal; and

based on the control signal, adjusting one or more of;

a center frequency of the baseband filter response, a quality factor of the baseband filter response, a gain of the baseband filter response, a bandwidth of the baseband filter response, and an attenuation slope of the baseband filter response.

20. The SAW-less transceiver of claim 15, wherein the inbound RF signal comprises one of a cellular RF signal, a Wireless Local Area Network signal, a Wireless Personal Area Network signal, and a millimeter wave signal.