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An I/Q active balanced harmonic mixer with IM2 cancelers and a 45° phase shifter

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3 Author(s)
Yamaji, T. ; Res. & Dev. Center, Toshiba Corp., Kawasaki, Japan ; Tanimoto, H. ; Kokatsu, H.

To reduce DC offset caused by local-oscillator-signal self-mixing in a direct-conversion receiver, an active balanced harmonic mixer with second-order intermodulation (IM2) canceler was proposed, and a direct downconverter containing the mixer and a 45° phase shifter was fabricated on a BiCMOS chip. The dc offset caused by the self-mixing was measured and found to be smaller than the noise level. A second-order intercept point at the input of +37 dBm was achieved with the IM2 canceler, which is suitable for direct conversion receivers for quadrature phase-shift keying signals containing an amplitude modulation component

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:33 ,  Issue: 12 )

Date of Publication:

Dec 1998

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