access icon free Compact wideband CMOS lumped-element Wilkinson power divider with asymmetric negative capacitance circuit

The authors developed a wideband on-chip Wilkinson power divider (WPD) using lumped-element transmission lines (LE TLs) with 2-port negative capacitance (NCAP) circuits that provide the phase response with a positive slope and broadband port impedance. The bandwidth of the WPD was increased using the broadband quarter-wavelength (λ/4) LE TLs with port-matched NCAP circuits. The WPD was implemented in the Global Foundry 8SF 130-nm RF CMOS IC technology. The size of the core chip is 1100 µm × 400 µm. The S-parameter measurements showed an absolute bandwidth ranging between 0.76 and 1.6 GHz, and a fractional bandwidth of 71.2%. In the frequency range of the bandwidth, the insertion loss was 0.4–3.4 dB, with the isolation between the two output ports was >18 dB, and the noise figures were 11–12 dB. The input-referred 1-dB gain compression point at the frequency of 1 GHz was ‒6 dBm.

Inspec keywords: lumped parameter networks; power dividers; S-parameters; CMOS integrated circuits; UHF integrated circuits

Other keywords: compact wideband CMOS; broadband port impedance; asymmetric negative capacitance circuit; size 400.0 mum; 2-port negative capacitance circuits; lumped-element transmission lines; fractional bandwidth; wideband on-chip Wilkinson power divider; WPD bandwidth; phase response; port-matched NCAP circuits; gain 1 dB; bandwidth 0.76 GHz to 1.6 GHz; broadband quarter-wavelength; core chip; Global Foundry 8SF RF CMOS IC technology; size 1100.0 mum; noise figure 11.0 dB to 12.0 dB; loss 0.4 dB to 3.4 dB; S-parameter measurements; size 130 nm; lumped-element Wilkinson power divider; frequency 1.0 GHz

Subjects: Microwave integrated circuits; CMOS integrated circuits; Waveguide and microwave transmission line components; Lumped linear networks

References

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      • 8. Bahl, I.: ‘Lumped elements for RF and microwave circuits’ (Artech House, Norwood, MA, USA, 2003).
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http://iet.metastore.ingenta.com/content/journals/10.1049/el.2020.1944
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