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A highly linear single balanced mixer based on heterojunction interband tunneling diode

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7 Author(s)
Cidronali, A. ; Dept. of Electron. & Telecommun., Florence Univ., Italy ; Collodi, G. ; Deshpande, M.R. ; El-Zein, N.
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In this paper, a compact and highly linear monolithic-microwave integrated circuit (MMIC) single balanced mixer based on heterojunction interband tunnel diode (HITD) technology working at 1.8 GHz is described. The prototype consists of a pair of HITDs biased at 0 V and a lumped-element directional coupler with arbitrary impedance terminations. The HITDs are in the InGaAs/InAlAs material system lattice matched to InP. The relevant feature of the mixer is the linearity due to the quasi-square-law dc current-voltage (IV) characteristics exhibited by the device around zero voltage. A qualitative treatment of the third-order intermodulation product and the conversion loss as a function of the HITDs IV characteristic and the embedding impedance is provided. The design techniques along with a detailed experimental validation are also provided. The prototype working in down-conversion mode, exhibited an third-order intercept point power level of +17.5 dBm, a conversion loss of 11 dB and a 1-dB compression point of +7 dBm at the operative frequency of 1.8 GHz with a +5-dBm local-oscillator drive level

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:49 ,  Issue: 12 )

Date of Publication:

Dec 2001

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