Adaptive radio transceiver with filtering

• US 7,756,472 B2
• Filed: 06/17/2008
• Issued: 07/13/2010
• Est. Priority Date: 10/21/1999
• Status: Expired due to Fees

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Khorram, Shahla, Darabi, Hooman, Rofougaran, Ahmadreza, Ibrahim, Brima
• Primary Examiner(s): Milord; Marceau
• Application Number:
  US12/140,813
• Publication Number:
  US 20080290966A1
• Time in Patent Office: 756 Days
• Field of Search: 455/20, 455/76, 455/260, 455/86, 455/88, 455/190.1, 455/118, 455/85, 455/78, 455/323, 455/180.3, 330/252, 330/257, 330/260, 323/237, 323/267, 326/41
• US Class Current: 455/20
• CPC Class Codes: H03B 21/01 by beating unmodulated signals of different frequencies
• CPC Class Codes: H03B 27/00 Generation of oscillations providing a plurality of outputs of the same frequency but differing in phase, other than merely two anti-phase outputs
• CPC Class Codes: H03F 1/56 Modifications of input or output impedances, not otherwise provided for
• CPC Class Codes: H03F 2200/318 A matching circuit being used as coupling element between two amplifying stages
• CPC Class Codes: H03F 2200/336 A I/Q, i.e. phase quadrature, modulator or demodulator being used in an amplifying circuit
• CPC Class Codes: H03F 2200/451 the amplifier being a radio frequency amplifier
• CPC Class Codes: H03F 2203/45138 Two or more differential amplifiers in IC-block form are combined, e.g. measuring amplifiers
• CPC Class Codes: H03F 2203/45386 the AAC comprising one or more coils in the source circuit
• CPC Class Codes: H03F 2203/45526 the FBC comprising a resistor-capacitor combination and being coupled between the LC and the IC
• CPC Class Codes: H03F 2203/45528 the FBC comprising one or more passive resistors and being coupled between the LC and the IC
• CPC Class Codes: H03F 2203/45638 the LC comprising one or more coils
• CPC Class Codes: H03F 3/19 with semiconductor devices only
• CPC Class Codes: H03F 3/245 with semiconductor devices only
• CPC Class Codes: H03F 3/45179 using MOSFET transistors as the active amplifying circuit H03F3/45278 takes precedence
• CPC Class Codes: H03F 3/45475 using IC blocks as the active amplifying circuit
• CPC Class Codes: H03G 11/00 Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
• CPC Class Codes: H03G 3/001 Digital control of analog signals
• CPC Class Codes: H03H 11/126 using a single operational amplifier H03H11/1204 takes precedence; parallel-T filters H03H11/1295
• CPC Class Codes: H03H 11/1291 Current or voltage controlled filters
• CPC Class Codes: H03H 11/22 providing two or more phase shifted output signals, e.g. n-phase output
• CPC Class Codes: H03H 11/344 : Duplexers
• CPC Class Codes: H03H 2011/0494 : Complex filters
• CPC Class Codes: H03H 21/0001 : Analogue adaptive filters
• CPC Class Codes: H03H 21/0012 : Digital adaptive filters
• CPC Class Codes: H03H 2210/025 : Capacitor
• CPC Class Codes: H03H 2210/036 : Stepwise
• CPC Class Codes: H03H 7/42 : Networks for transforming balanced signals into unbalanced signals and vice versa, e.g. baluns
• 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
• CPC Class Codes: H03L 7/18 : using a frequency divider or counter in the loop H03L7/20, H03L7/22 take precedence
• CPC Class Codes: H04B 17/104 : of other parameters, e.g. DC offset, delay or propagation times
• CPC Class Codes: H04B 17/14 : of the whole transmission and reception path, e.g. self-test loop-back
• CPC Class Codes: H04B 17/19 : Self-testing arrangements

Abstract

An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a controller, and a self-testing unit. All of these components can be packaged for integration into a single IC including components such as filters and inductors. The controller for adaptive programming and calibration of the receiver, transmitter and LO generator. The self-testing unit generates is used to determine the gain, frequency characteristics, selectivity, noise floor, and distortion behavior of the receiver, transmitter and LO generator. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or the meaning of the claims.

Claims

1. One or more integrated circuits of a transceiver that supports wireless spread spectrum communications in a wireless communications device, comprising:

a plurality of cascaded filters; and

a bypass circuit operatively coupled across at least one of the cascaded filters,

wherein each of the cascaded filters comprises a first amplifier and a second amplifier, wherein the first amplifier and the second amplifier comprise a feedback loop,

wherein the feedback loop comprises a feedback impedance, and

wherein the feedback impedance comprises components that are operatively coupled in parallel.

2. The one or more integrated circuits according to claim 1, wherein at least one of the feedback impedances is programmable.

3. The one or more integrated circuits according to claim 2, wherein the at least one programmable feedback impedances comprises a plurality of resistors operatively coupled in series, and wherein each of the plurality of resistors has a switch operatively coupled across it.

4. The one or more integrated circuits according to claim 2, wherein the feedback impedance comprises components that are operatively coupled in parallel and operatively coupled in series.

5. The one or more integrated circuits according to claim 1, wherein the feedback impedance comprises at least one of a programmable feedback capacitor and a programmable feedback resistor.

6. The one or more integrated circuits according to claim 5, wherein the at least one programmable feedback capacitor comprises a plurality of capacitors operatively coupled in parallel, and wherein each of the plurality of capacitors has a switch operatively coupled across it.

7. The one or more integrated circuits according to claim 1, wherein each of the cascaded filters comprises a first cross coupled resistor and a second cross coupled resistor, wherein the first cross coupled resistor is operatively coupled between an output of the first amplifier and an input of the second amplifier, and wherein the second cross coupled resistor is operatively coupled between an output of the second amplifier and an input of the first amplifier.

8. The one or more integrated circuits according to claim 7, wherein each of the cascaded filters comprises a first input resistor and a second input resistor, wherein the first input resistor is operatively coupled to the input of the first amplifier, and wherein the second input resistor is operatively coupled to the input of the second amplifier.

9. The one or more integrated circuits according to claim 8, wherein each of the cascaded filters comprises an input capacitor that has a first end and a second end, wherein the first end of the input capacitor is operatively coupled to the first input resistor, and wherein the second end of the input capacitor is operatively coupled to the second input resistor.

10. The one or more integrated circuits according to claim 1, wherein the one or more integrated circuits are part of a single integrated circuit chip.

11. The one or more integrated circuits according to claim 10, wherein the wireless communications device supports orthogonal frequency division multiplexing.

12. The one or more integrated circuits according to claim 10, wherein the wireless communications device supports frequency hopping.

13. The one or more integrated circuits according to claim 10, wherein the plurality of cascaded filters and the bypass circuit are part of a programmable complex filter.

14. The one or more integrated circuits according to claim 13, wherein the programmable complex filter is tunable.

15. The one or more integrated circuits according to claim 13, comprising:

a complex mixer that is operatively coupled to the programmable complex filter.

16. The one or more integrated circuits according to claim 13, wherein the programmable complex filter is an active complex filter.

17. The one or more integrated circuits according to claim 16, wherein the active complex filter comprises differential amplifiers.

18. The one or more integrated circuits according to claim 1, wherein the one or more integrated circuits are part of a single integrated circuit transceiver chip.

19. The one or more integrated circuits according to claim 1, wherein the plurality of cascaded filters and the bypass circuit are part of receiver circuitry of the transceiver.

20. The one or more integrated circuits according to claim 19, wherein the wireless communications device supports orthogonal frequency division multiplexing.

21. The one or more integrated circuits according to claim 19, wherein the wireless communications device supports frequency hopping.

22. The one or more integrated circuits according to claim 19, wherein the plurality of cascaded filters and the bypass circuit are part of a programmable complex filter.

23. The one or more integrated circuits according to claim 22, wherein the programmable complex filter is tunable.

24. The one or more integrated circuits according to claim 22, wherein the receiver circuitry comprises a mixer, and wherein the mixer is operatively coupled to the programmable complex filter.

25. The one or more integrated circuits according to claim 24, wherein the mixer is a complex mixer.

26. The one or more integrated circuits according to claim 22, wherein the programmable complex filter is an active complex filter.

27. The one or more integrated circuits according to claim 19, wherein the wireless communications device supports direct sequence spread spectrum modulation.

28. The one or more integrated circuits according to claim 27, wherein the feedback impedance comprises a resistor and a capacitor, and wherein the resistor and the capacitor are in parallel.

29. The one or more integrated circuits according to claim 19, wherein the wireless communications device supports wireless local area network communications and different modes of wireless spread spectrum communications.

30. The one or more integrated circuits according to claim 19, wherein the transceiver supports different data rates and different modulation schemes.

31. The one or more integrated circuit according to claim 19, wherein the wireless communications device supports wireless local area network communications and Bluetooth communications.

32. The one or more integrated circuits according to claim 1, the feedback impedance comprises a resistor and a capacitor, and wherein the resistor and the capacitor are in parallel.

33. The one or more integrated circuits according to claim 1, wherein the wireless communications device supports wireless local area network communications and different modes of wireless spread spectrum communications.

34. The one or more integrated circuits according to claim 1, wherein the transceiver supports different data rates and different modulation schemes.

35. The one or more integrated circuit according to claim 1, wherein the wireless communications device supports wireless local area network communications and Bluetooth communications.