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Noise canceling balun-LNA with enhanced IIP2 and IIP3 for digital TV applications

Saeedi, S

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  1. Type of Document: Article
  2. DOI: 10.1587/transele.E95.C.146
  3. Abstract:
  4. An inductorless low noise amplifier (LNA) with active balun for digital TV (DTV) applications is presented. The LNA exploits a noise cancellation technique which allows for simultaneous wide-band impedance matching and low noise design. The matching and amplifier stages in the LNA topology perform single-ended to differential signal conversion with balanced output. The second and third-order nonlinearity of the individual amplifiers as well as the distortion caused by the interaction between the stages are suppressed to achieve high IIP2 and IIP3. A method for intrinsic cancellation of the second-order interaction is employed to reduce the dependence of the IIP3 on the frequency spacing between the interfering signals in the two-tone test of DTV tuners. Fabricated in a 0.18 μm CMOS technology, the LNA core size is 0.21mm 2. Measurements show that the LNA IIP3 and IIP2 are +12 dBm and +21 dBm, respectively. The IIP3 variation is less than 5 dB in the 10MHz to 200 MHz frequency spacing range. A voltage gain of 14.5 dB and a noise figure below 4 dB are achieved in a frequency range from 100 MHz to 1 GHz. The LNA consumes 11mA from a 1.8V supply voltage
  5. Keywords:
  6. Noise cancellation ; Output balancing ; Active baluns ; CMOS technology ; Core size ; Digital TV ; Distortion cancellation ; Frequency ranges ; Frequency spacing ; Inductorless ; Interfering signals ; Low-noise designs ; Second-order interaction ; Single-ended to differential ; Supply voltages ; Third-order non-linearity ; Two-tone tests ; Voltage gain ; Wideband impedance matching ; CMOS integrated circuits ; Digital television ; Impedance matching (electric) ; Spurious signal noise ; Television broadcasting ; Low noise amplifiers
  7. Source: IEICE Transactions on Electronics ; Volume E95-C, Issue 1 , 2012 , Pages 146-154 ; 09168524 (ISSN)
  8. URL: https://www.jstage.jst.go.jp/article/transele/E95.C/1/E95.C_1_146/_article