Dual stage carrier-aggregation (CA) low noise amplifier (LNA) having harmonic rejection and high linearity

Patent metadata

Field	Value
Publication number	US-9374043-B2
Application number	US-201414292216-A
Country	US
Kind code	B2
Filing date	May 30, 2014
Priority date	May 30, 2014
Publication date	Jun 21, 2016
Grant date	Jun 21, 2016

Abstract

A device includes a load circuit configured to receive an amplified communication signal, the load circuit having a center tapped inductor structure configured to divide the amplified communication signal into a first portion and a second portion, the load circuit configured to resonate at a harmonic of the amplified communication signal.

First claim

What is claimed is:

1. A device, comprising:
a load circuit configured to receive an amplified communication signal, the load circuit having a center tapped inductor structure configured to divide the amplified communication signal into a first portion and a second portion, the load circuit configured to resonate at a harmonic of the amplified communication signal; and
a two-stage low noise amplifier (LNA) comprising a first LNA stage and a second LNA stage, the first LNA stage configured to generate the amplified communication signal to the load circuit, the load circuit configured to apply the first portion of the amplified communication signal to at least two amplifiers in the second LNA stage.

2. The device of claim 1 , wherein the load circuit comprises a first inductor and a second inductor, a first adjustable capacitor and a second adjustable capacitor.

3. The device of claim 2 , wherein the second inductor and the second adjustable capacitor are configured to create a notch filter response at the harmonic of the amplified communication signal.

4. The device of claim 2 , wherein the first adjustable capacitor is configured to resonate with the first inductor and the second inductor at a desired receive frequency.

5. A device, comprising:
a load circuit comprising a first inductor, a second inductor, a first adjustable capacitor, and a second adjustable capacitor, the load circuit configured to receive an amplified communication signal, the load circuit having a center tapped inductor structure configured to divide the amplified communication signal into a first portion and a second portion, wherein the first adjustable capacitor is configured to resonate with the first inductor and the second inductor to develop a feedback signal, the feedback signal comprising the second portion of the amplified communication signal.

6. The device of claim 2 , wherein the second inductor is configured to resonate with the second adjustable capacitor at a frequency corresponding to a third harmonic of the amplified communication signal.

7. The device of claim 6 , wherein the second inductor configured to resonate with the second adjustable capacitor at a frequency corresponding to a third harmonic of the amplified communication signal is configured to cancel a third harmonic of the amplified communication signal.

8. A method, comprising:
amplifying a communication signal in a first stage of a two stage low noise amplifier (LNA);
dividing at a center tapped inductor structure of a load circuit the amplified communication signal into a first portion and a second portion;
providing the first portion to a plurality of amplification paths in a second stage of the two-stage LNA; and
resonating at a harmonic frequency of the amplified communication signal.

9. The method of claim 8 , wherein the resonating creates a notch filter response at the harmonic of the amplified communication signal.

10. The method of claim 8 , further comprising resonating at a frequency corresponding to a third harmonic of the amplified communication signal.

11. The method of claim 10 , wherein resonating at a frequency corresponding to a third harmonic of the amplified communication signal cancels a third harmonic of the amplified communication signal.

12. A device, comprising:
means for amplifying a communication signal in a first stage of a two stage low noise amplifier (LNA);
means for dividing the amplified communication signal into a first portion and a second portion and for applying the first portion to a plurality of amplification paths in a second stage of the two-stage LNA; and
means for resonating at a harmonic frequency of the amplified communication signal; and
means for creating a notch filter response at the harmonic of the amplified communication signal.

13. The device of claim 12 , further comprising means for resonating at a frequency corresponding to a third harmonic of the amplified communication signal.

14. The device of claim 13 , further comprising means for canceling a third harmonic of the amplified communication signal.

15. The device of claim 12 , wherein the means for dividing comprises a load circuit.

16. The device of claim 15 , wherein the load circuit comprises a center tapped inductor structure.

Assignees

• Qualcomm Inc

Inventors

• Wang Chuan
• Pan Dongling
• Tang Yiwu
• Van Zalinge Klaas
• Hassan Muhammad

Classifications

• H03F2200/111

  the amplifier being a dual or triple band amplifier, e.g. 900 and 1800 MHz, e.g. switched or not switched, simultaneously or not · CPC title

• H03F2200/294

  the amplifier being a low noise amplifier [LNA] · CPC title

• H04B1/40

  Circuits · CPC title

• H03F1/26 Primary

  Modifications of amplifiers to reduce influence of noise generated by amplifying elements · CPC title

• H03F2200/171

  A filter circuit coupled to the output of an amplifier · CPC title