IP Library › Granted Patent US 9,209,910
Granted Patent B2
US 9,209,910 · App. 14/227,877 · Granted Dec 8, 2015

Blocker filtering for noise-cancelling receiver

Inventors: Hajir Hedayati (San Diego, CA); Wing Fat Andy Lau (San Diego, CA); Jeremy Darren Dunworth (San Diego, CA)
Assignee: QUALCOMM Incorporated
H04B15/005H04B1/26H04B15/06
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Quick Facts
Patent No.
US 9,209,910
App. No.
14/227,877
Granted
Dec 8, 2015
Kind
B2
Abstract

Techniques for improving rejection of out-of-band interference in a noise-cancelling receive architecture. In an aspect, capacitors blocking in-band signals and passing through out-of-band signals destructively couple an auxiliary mixer output to a mixer output. In a further aspect, cross-coupling capacitors are provided to couple a first signal path with a second signal path of the noise-cancelling receive signal path. Baseband poly phase cross-coupling blocker filtering is further provided for out-of-band interference cancellation to create notch responses at blocker offset frequencies. The techniques disclosed may readily be adapted for multi-phase local oscillator systems.

Claims (67)

1. An apparatus comprising:

a first mixer configured to mix a signal derived from an input signal with a local oscillator (LO) signal to generate a first mixer output;

a first auxiliary mixer configured to mix the signal derived from the input signal with the LO signal to generate a first auxiliary mixer output, the first auxiliary mixer output coupled to the first mixer output to reduce an out-of-band component in the first mixer output;

a second mixer configured to mix the input signal with the local oscillator (LO) signal to generate a second mixer output;

a second auxiliary mixer configured to mix the input signal with the LO signal to generate a second auxiliary mixer output, the second auxiliary mixer output coupled to the second mixer output to reduce an out-of-band component in the second mixer output; and

a trans-impedance amplifier configured to sum the first and second mixer outputs to generate an output voltage.

2. The apparatus of claim 1 , each of the first, first auxiliary, second, and second auxiliary mixers comprising a single-balanced mixer.

3. The apparatus of claim 1 , the first mixer output coupled to the first auxiliary mixer output by a high-pass filter.

4. The apparatus of claim 3 , the high-pass filter comprising a capacitor.

5. The apparatus of claim 1 , further comprising cross-coupling capacitors coupling the first and second mixer outputs to each other.

6. The apparatus of claim 1 , further comprising:

a first Q mixer configured to mix the signal derived from the input signal with a quadrature local oscillator (LO) signal to generate a first Q mixer output;

a first auxiliary Q mixer configured to mix the signal derived from the input signal with the quadrature LO signal to generate a first auxiliary Q mixer output, the first auxiliary Q mixer output coupled to the first Q mixer output to reduce an out-of-band component in the first Q mixer output;

a second Q mixer configured to mix the input signal with the quadrature local oscillator (LO) signal to generate a second Q mixer output;

a second auxiliary Q mixer configured to mix the input signal with the quadrature LO signal to generate a second auxiliary Q mixer output, the second auxiliary Q mixer output coupled to the second Q mixer output to reduce an out-of-band component in the second Q mixer output.

7. The apparatus of claim 6 , further comprising cross-coupling capacitors coupling the first Q mixer output to the second mixer output, and the second Q mixer output to the first mixer output.

8. The apparatus of claim 6 , further comprising:

an in-phase trans-impedance amplifier configured to sum the first mixer output and the first auxiliary mixer output; and

a quadrature trans-impedance amplifier configured to sum the first Q mixer output and the first Q auxiliary mixer output.

9. The apparatus of claim 1 , further comprising:

at least one multi-phase first mixer configured to mix the signal derived from the input signal with a corresponding multi-phase LO signal;

at least one additional multi-phase first auxiliary mixer configured to mix the signal derived from the input signal with the corresponding multi-phase LO signal to generate at least one multi-phase first auxiliary mixer output, the at least one multi-phase first auxiliary mixer output coupled to the first mixer output to reduce an out-of-band component in the at least one multi-phase first mixer output;

at least one multi-phase second mixer configured to mix the input signal with the corresponding multi-phase local oscillator (LO) signal to generate at least one multi-phase second mixer output; and

at least one multi-phase second auxiliary mixer configured to mix the input signal with the corresponding multi-phase LO signal to generate at least one multi-phase second auxiliary mixer output, the at least one multi-phase second auxiliary mixer output coupled to the at least one multi-phase second mixer output to reduce an out-of-band component in the at least one multi-phase second mixer output.

10. The apparatus of claim 1 , wherein the phase of a local oscillator coupled to the first auxiliary mixer is offset relative to the phase of a local oscillator coupled to the first mixer by 90 degrees.

11. An apparatus comprising:

means for down-converting a signal derived from an input signal to generate a first mixer output current;

means for down-converting the signal derived from the input signal to generate a first auxiliary mixer output current;

means for combining the first auxiliary mixer output current with the first mixer output current to reduce an out-of-band component in the first mixer output current;

means for down-converting the input signal to generate a second mixer output current;

means for down-converting the input signal to generate a second auxiliary mixer output current;

means for combining the second auxiliary mixer output current with the second mixer output current to reduce an out-of-band component in the second mixer output current;

means for combining the first and second mixer output currents to generate an output voltage.

12. The apparatus of claim 11 , further comprising means for cross-coupling the first mixer output current to the second mixer output current.

13. The apparatus of claim 11 , further comprising:

means for down-converting the signal derived from the input signal to generate a first Q mixer output current;

means for down-converting the signal derived from the input signal to generate a first auxiliary Q mixer output current;

means for combining the first auxiliary Q mixer output current with the first Q mixer output current to reduce an out-of-band component in the first Q mixer output current;

means for down-converting the input signal to generate a second Q mixer output current;

means for down-converting the input signal to generate a second auxiliary Q mixer output current;

means for combining the second auxiliary Q mixer output current with the second Q mixer output current to reduce an out-of-band component in the second Q mixer output current;

means for combining the first and second Q mixer output currents to generate an output voltage.

14. The apparatus of claim 13 , further comprising:

means for cross-coupling the first Q mixer output to the second mixer output; and

means for cross-coupling the second Q mixer output to the first mixer output.

15. The apparatus of claim 11 , each of the first, first auxiliary, second, and second auxiliary mixers comprising a single-balanced mixer.

16. A method comprising:

down-converting a signal derived from an input signal to generate a first mixer output current;

down-converting the signal derived from the input signal to generate a first auxiliary mixer output current;

combining the first auxiliary mixer output current with the first mixer output current to reduce an out-of-band component in the first mixer output current;

down-converting the input signal to generate a second mixer output current;

down-converting the input signal to generate a second auxiliary mixer output current;

combining the second auxiliary mixer output current with the second mixer output current to reduce an out-of-band component in the second mixer output current;

combining the first and second mixer output currents to generate an output voltage.

17. The method of claim 16 , further comprising coupling the first mixer output current to the second mixer output current using cross-coupling capacitors.

18. The method of claim 16 , further comprising:

down-converting the signal derived from the input signal to generate a first Q mixer output current;

down-converting the signal derived from the input signal to generate a first auxiliary Q mixer output current;

combining the first auxiliary Q mixer output current with the first Q mixer output current to reduce an out-of-band component in the first Q mixer output current;

down-converting the input signal to generate a second Q mixer output current;

down-converting the input signal to generate a second auxiliary Q mixer output current;

combining the second auxiliary Q mixer output current with the second Q mixer output current to reduce an out-of-band component in the second Q mixer output current;

combining the first and second Q mixer output currents to generate an output voltage.

19. The method of claim 18 , further comprising:

coupling the first Q mixer output to the second mixer output using cross-coupling capacitors; and

coupling the second Q mixer output to the first mixer output using cross-coupling capacitors.

20. The method of claim 16 , each of the first, first auxiliary, second, and second auxiliary mixers comprising a single-balanced mixer.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded May 13, 2014
From: HEDAYATI, HAJIR; LAU, WING FAT ANDY; DUNWORTH, JEREMY DARREN
To: QUALCOMM INCORPORATED
Reel/Frame 032881/0707 →
Continuity (2)
Provisional Application 61871990 · Aug 30, 2013
Related Publication 20150063509A1 · Mar 5, 2015