Signal converting apparatus and receiving apparatus for supporting concurrent dual bands in wireless communication system

Abstract

A receiving apparatus in a wireless communication system includes: an antenna configured to receive a wireless frequency signal including a first frequency band signal and a second frequency band signal; a low noise amplifier (LNA) configured to amplify the wireless frequency signal, output the first frequency band signal as a differential phase signal, and output the second frequency band signal as a common phase signal; a differentiator configured to pass only the differential phase signal between the signals outputted from the LNA; and a combiner configured to pass only the common phase signal between the signals outputted from the LNA.

1 - 10 . (canceled) 
     
     
         11 . A load circuit of an LNA, comprising a first capacitor, a second capacitor, a third capacitor, a first inductor, and a second inductor,
 wherein the third capacitor is coupled between a first node and a second node,   wherein one ends of the first inductor and the first capacitor are coupled between the first node and the third capacitor,   wherein the second inductor and the second capacitor are coupled between the second node and the third capacitor, and   wherein the other ends of the first inductor, the first capacitor, the second inductor, and the second capacitor are coupled to a ground terminal.   
     
     
         12 . The load circuit according to  claim 11 , further comprising a varactor,
 wherein the varactor is coupled in parallel to the third capacitor.   
     
     
         13 . The load circuit according to  claim 11 , further comprising a first varactor and a second varactor,
 wherein the first varactor is coupled in parallel to the first capacitor, and the second varactor is coupled in parallel to the second capacitor.   
     
     
         14 . The load circuit according to  claim 11 , wherein the LNA is configured to amplify a wireless frequency signal comprising a first frequency band signal and a second frequency band signal, outputs the first frequency band signal as a differential phase signal, and outputs the second frequency band signal as a common phase signal. 
     
     
         15 . An LNA comprising:
 an input terminal; and   a first intermediate tap inductor comprising:
 an impedance matching unit configured to match a single-phase signal inputted through the input terminal; 
 first and second inductors coupled to the impedance matching unit and having one ends coupled symmetrically through a first tap; and 
 a first second parasitic capacitor and a second capacitor being symmetrical with the first tap, 
   wherein the first intermediate tap inductor configured to convert the single-phase signal outputted from the impedance matching unit into a differential phase signal and a common phase signal.   
     
     
         16 . The LNA according to  claim 15 , further comprising:
 a first cascode amplification unit coupled to the other end of the first inductor through the input terminal; and   a second cascode amplification unit coupled to the other end of the second inductor through the input terminal,   wherein the first cascode amplification unit and the second cascode amplification unit are configured to amplify and output the differential phase signal and the common phase signal.   
     
     
         17 . The LNA according to  claim 16 , further comprising a second intermediate tap inductor comprising:
 third and fourth inductors having one ends coupled symmetrically through a second tap; and   a third parasitic capacitor and a third capacitor being symmetrical with the second tap,   wherein the other end of the third inductor is coupled to an output terminal of the first cascode amplification unit, and the other end of the fourth inductor is coupled an output terminal of the second cascode amplification unit.   
     
     
         18 . The LNA according to  claim 15 , wherein the impedance matching unit comprises a transistor having a source coupled to the input terminal, a gate configured to receive a bias voltage, and a drain configured to output the matched single phase signal.