Input switch leakage compensation

• US 9,473,085 B2
• Filed: 09/19/2014
• Issued: 10/18/2016
• Est. Priority Date: 09/09/2014
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Lakdawala, Hasnain Mohammedi, Choksi, Ojas Mahendra, Fan, Bin
• Primary Examiner(s): GONZALES, APRIL GUZMAN
• Application Number:
  US14/491,817
• Publication Number:
  US 20160072441A1
• Time in Patent Office: 760 Days
• Field of Search: 455/78
• US Class Current: 1/1
• CPC Class Codes: H03F 1/0261 with control of the polarisation voltage or current, e.g. gliding Class A
• CPC Class Codes: H03F 1/223 with MOSFET's
• CPC Class Codes: H03F 2200/294 the amplifier being a low noise amplifier [LNA]
• CPC Class Codes: H03F 2200/541 Transformer coupled at the output of an amplifier
• CPC Class Codes: H03F 2203/21106 An input signal being distributed in parallel over the inputs of a plurality of power amplifiers
• CPC Class Codes: H03F 2203/21109 An input signal being distributed by switching to a plurality of paralleled power amplifiers
• CPC Class Codes: H03F 3/193 with field-effect devices H03F3/195 takes precedence
• CPC Class Codes: H03F 3/211 using a combination of several amplifiers H03F3/60 takes precedence
• CPC Class Codes: H03F 3/245 with semiconductor devices only
• CPC Class Codes: H04B 1/0053 with common antenna for more than one band
• CPC Class Codes: H04B 1/0475 with means for limiting noise, interference or distortion H04B1/0483 takes precedence
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver

Abstract

An apparatus including: a first switch configured to provide a feed-forward path at an input of a first amplifier of a plurality of amplifiers coupled together at a single port, the feed-forward path configured to substantially reduce a leakage current into an input of a second amplifier of the plurality of amplifiers.

Claims

1. An apparatus comprising:

a bias circuit configured to provide a bias voltage to a plurality of amplifiers, inputs of the plurality of amplifiers are coupled to a single port; and

a first switch configured to direct a leakage current away from an input of a first amplifier of the plurality of amplifiers through a bypass path from an output of the bias circuit to an input of a second amplifier of the plurality of amplifiers.

2. The apparatus of claim 1, each of the plurality of amplifiers includes a low noise amplifier.

3. The apparatus of claim 1, the bias voltage is a DC bias voltage.

4. The apparatus of claim 1, the first amplifier is an operating mode and the second amplifier is in an idle mode.

5. The apparatus of claim 4, further comprising

a second switch coupled to the second amplifier, the second switch configured to ground the input of the second amplifier.

6. The apparatus of claim 1, further comprising

a third amplifier coupled to the single port.

7. The apparatus of claim 1, further comprising

third and fourth switches configured to connect the single port to the input of the second amplifier.

8. The apparatus of claim 7, wherein the bypass path is coupled to a connection point between the third and fourth switches.

9. The apparatus of claim 8, wherein the first switch is configured to connect the bias circuit to the connection point when the third and fourth switches are in open states.

10. The apparatus of claim 7, further comprising

fifth and sixth switches configured to connect the single port to the input of the first amplifier.

11. The apparatus of claim 10, the first amplifier is an idle mode and the second amplifier is in an operating mode.

12. The apparatus of claim 11, further comprising

a seventh switch coupled to the first amplifier, the seventh switch configured to ground the input of the first amplifier.

13. An apparatus comprising:

means for biasing first and second amplifiers, inputs of the first and second amplifiers are coupled to a single port; and

means for directing a leakage current away from an input of the first amplifier through a bypass path from an output of the means for biasing to an input of the second amplifier.

14. The apparatus of claim 13, further comprising

means for grounding the input of the second amplifier.

15. The apparatus of claim 13, further comprising

means for connecting the single port to the input of the second amplifier.

16. The apparatus of claim 15, the means for directing is configured to connect the bypass path at the means for connecting.

17. The apparatus of claim 13, further comprising

means for connecting the single port to the input of the first amplifier.

18. The apparatus of claim 13, further comprising

means for grounding the input of the first amplifier.

19. An apparatus comprising:

a plurality of amplifiers, inputs of the plurality of amplifiers are coupled to a single port;

a bias circuit configured to provide a bias voltage to plurality of amplifiers; and

a first switch configured to direct a leakage current away from an input of a first amplifier of the plurality of amplifiers through a bypass path from an output of the bias circuit to an input of a second amplifier of the plurality of amplifiers.

20. The apparatus of claim 19, further comprising

second and third switch coupled to the input of the second amplifier,

the first switch coupled to a connection point between the second switch and the third switch.

21. The apparatus of claim 19, wherein the apparatus is a receiver.