K-band 0/180° balanced phase shifter with dc-offset cancellation

Author

Lee, Han ; Moon, Seong-Mo ; Dong, H.-J. ; Lee, Moon-Que ; Yu, J.-W.

Author_Institution

Electr. Eng., KAIST, Daejeon, South Korea

Volume

49

Issue

19

fYear

2013

fDate

Sept. 12 2013

Firstpage

1234

Lastpage

1235

Abstract

K-band 0°/180° phase shifter MMIC based on balanced structure which can be applied to BPSK or QPSK modulator with dc-offset cancellation is presented. The proposed balanced phase shifter consists of four Lange couplers, two quarter-wave transmission lines and four switches for open and short terminations. The proposed structure implemented in GaAs 0.15-μm low noise pHEMT process ensures stable 0/180° phase shift while common-mode signals due to the mismatch in reflections by open and short are fed to the isolation port. The proposed phase shifter is verified by the phase shift of 179 ± 1.5° with the insertion loss of 4.5 ± 0.8 dB from 17.5 to 22.5 GHz. The fabricated phase shifter size is 2.2 × 2.85 mm including test pads.

Keywords

HEMT integrated circuits; III-V semiconductors; MMIC phase shifters; field effect MMIC; gallium arsenide; modulators; quadrature phase shift keying; transmission lines; 0/180° balanced phase shifter MMIC; BPSK modulator; DC offset cancellation; GaAs; Lange couplers; QPSK modulator; frequency 17.5 GHz to 22.5 GHz; isolation port; loss 4.5 dB; low noise pHEMT process; quadrature phase shift keying; quarter-wave transmission lines; size 0.15 mum; size 2.2 mm; size 2.85 mm;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el.2013.1666

Filename

6612800