LOW NOISE AMPLIFIER

• US 20130251080A1
• Filed: 03/14/2013
• Published: 09/26/2013
• Est. Priority Date: 03/20/2012
• Status: Abandoned Application

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Dadia, Kunal Jayant
• Application Number:
  US13/830,581
• Publication Number:
  US 20130251080A1
• Time in Patent Office: Days
• US Class Current: 375/349
• CPC Class Codes: H03F 2200/111 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 Class Codes: H03F 2200/294 the amplifier being a low noise amplifier [LNA]
• CPC Class Codes: H03F 3/195 in integrated circuits
• CPC Class Codes: H03F 3/211 using a combination of several amplifiers H03F3/60 takes precedence
• CPC Class Codes: H04L 27/0002 analog front ends; means for connecting modulators, demodulators or transceivers to a transmission line duplex arrangements H04L5/143

Abstract

A low noise amplifier for use in a front end includes a multiple-input interference canceller configured to receive a plurality of input signals, and output a signal from which an interference component is removed. The multiple-input interference canceller includes a plurality of gain control blocks configured to receive each of the input signals, and perform gain control, and a coupling block configured to couple output signals of the gain control blocks.

Claims

1. A low noise amplifier for use in a front end comprising:

a multiple-input interference canceller configured to receive a plurality of input signals, and output a signal from which an interference component is removed,

wherein the multiple-input interference canceller includes;

a plurality of gain control blocks configured to receive each of the input signals, and perform gain control, and

a coupling block configured to couple output signals of the gain control blocks.

2. The low noise amplifier of claim 1, wherein the input signals are differential or independent signals.

3. The low noise amplifier of claim 1, wherein the gain control blocks have mutually-dependent gain values or independent gain values.

4. The low noise amplifier of claim 1, wherein each of the gain control blocks includes:

a pull-down unit for pulling down an output terminal in response to each input signal; and

a pull-up unit for pulling up the output terminal.

5. The low noise amplifier of claim 4, wherein each of the gain control blocks further includes:

an input potential controller that is connected between an input terminal receiving each input signal and an external power source so as to control potential of an input terminal.

6. The low noise amplifier of claim 5, wherein the input potential controller includes:

a first resistor connected to the external power source;

an NMOS diode connected between the first resistor and a ground terminal; and

a second resistor connected between the input terminal and a gate terminal of the NMOS diode.

7. The low noise amplifier of claim 4, wherein the output terminals of the gain control blocks are commonly connected to a final output terminal of the multiple-input interference canceller.

8. The low noise amplifier of claim 4, wherein each of the gain control blocks further includes:

a capacitor connected to a gate terminal of the pull-down unit and a ground terminal so as to perform potential maintenance or buffering operation.

9. The low noise amplifier of claim 1, wherein the coupling block is an adder or a subtractor.