SWITCH LINEARIZER

• US 20150022024A1
• Filed: 07/17/2013
• Published: 01/22/2015
• Est. Priority Date: 07/17/2013
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Dicicco, Marc Gerald, Zhang, Xiangdong, Wang, Xinwei
• Granted Patent: US 10,491,209 B2
• Time in Patent Office: Days
• US Class Current: 307/109
• CPC Class Codes: H03K 17/16 Modifications for eliminating interference voltages or currents
• CPC Class Codes: H03K 17/162 without feedback from the output circuit to the control circuit

Abstract

Exemplary embodiments are related to switch linearizer. A device may include at least one switch. The device may further include a linearizer coupled to the at least one switch and configured to cancel at least a portion of distortion generated by the at least one switch in an off-state.

Claims

1. A device, comprising:

at least one switch; and

a linearizer coupled to the at least one switch and configured to cancel at least a portion of distortion generated by the at least one switch in an off-state.

2. The device of claim 1, each switch of the at least one switch comprising a plurality of stacked transistors.

3. The device of claim 1, the linearizer comprising a varactor coupled in parallel with the at least one switch.

4. The device of claim 3, the linearizer further comprising a plurality of metal-insulator-metal (MIM) capacitors coupled in series with the varactor.

5. The device of claim 1, further comprising a digital variable capacitor (DVC) comprising the at least one switch.

6. The device of claim 5, further comprising an antenna tuning circuit comprising the DVC.

7. The device of claim 1, the linearizer configured to generate 3^rd order distortion having an amplitude substantially equal to an amplitude of 3^rd order distortion generated by the at least one switch and a phase opposite of a phase of the 3^rd order distortion generated by the at least one switch.

8. The device of claim 1, the at least one switch configured to generate a positive 3^rd order distortion term and the linearizer configured to generate a negative 3^rd order distortion term.

9. The device of claim 1, the linearizer comprising a varactor configured to generate 3^rd order distortion to destructively interfere with 3^rd order distortion generated by the at least one switch.

10. The device of claim 9, the varactor configured to receive a tuning voltage for controlling a magnitude of the 3^rd order distortion generated by the varactor.

11. A method, comprising:

configuring a switch in an off-state; and

substantially cancelling distortion generated by the switch in the off-state with distortion generated by a varactor.

12. The method of claim 11, wherein substantially cancelling comprises generating a 3^rd order term of a capacitance of the varactor having an amplitude substantially equal to an amplitude of a 3^rd order term of a capacitance of the switch and a phase opposite of a phase of the 3^rd order term of the switch.

13. The method of claim 11, further comprising adjusting a tuning voltage conveyed to the varactor to adjust a magnitude of a 3^rd order term of a capacitance of the varactor to substantially match a magnitude of a 3^rd order term of a capacitance of the switch.

14. A device, comprising:

means for configuring at least one switch in an off-state; and

means for substantially cancelling distortion of the at least one switch in the off-state.

15. The device of claim 14, the means for substantially cancelling comprising means for generating 3^rd order distortion having an amplitude substantially equal to an amplitude of 3^rd order distortion generated by the at least one switch and a phase opposite of a phase of the 3^rd order distortion generated by the at least one switch.

16. The device of claim 14, further comprising means for conveying a tuning voltage to adjust a magnitude of 3^rd order distortion generated by the means for substantially cancelling to substantially match a magnitude of 3^rd order distortion generated by the at least one switch in the off-state.

17. The device of claim 14, further comprising means for adjusting a tuning voltage conveyed to the means for substantially cancelling to adjust a magnitude of a 3^rd order term of a capacitance of the means for substantially cancelling to substantially match a magnitude of a 3^rd order term of a capacitance of the at least one switch.

18. The device of claim 14, the means for configuring comprising means for conveying a bias voltage to the at least one switch to configure the at least one switch in the off-state.

19. The device of claim 14, the means for substantially cancelling comprising means for generating 3^rd order distortion with the means for substantially cancelling to destructively interfere with 3^rd order distortion generated by the at least one switch.

20. The device of claim 14, the means for substantially cancelling distortion of the at least one switch in the off-state comprising means for substantially cancelling 3^rd order distortion of the at least one switch in the off-state.