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A Novel 330 GHz Sub-Harmonic Mixer with Independently Biased Schottky Diodes

Authors:
Jeanne Treuttel, B. Thomas, A. Maestrini, J. V.-Siles, C. Lee, I. Mehdi
Abstract:
The balanced properties and local oscillator (LO) frequency put to half the RF frequency of the subharmonically pumped mixers give a great advantage over single ended mixers. Moreover, biasing independently the two diodes offer the advantages of 1) reducing the LO power requirement, 2) allowing a larger range of LO power to pump the mixer and therefore improve the relative bandwidth with no other tuning than the LO frequency, and 3) compensating the asymmetries found for DC parameters characterization through I-V curve measurement. Nevertheless the implementation of DC-bias circuitry at high frequency is particularly delicate and mounting uncertainties can result in a breaking of the symmetry involved in the balance of the device and produce cross-mode coupling. Fairly large capacitors near the diode cell have been used in with diodes in a balanced configuration, but this solution reduces the mode confinement near the diode and relies on the circuit mounting. Very compact on-chip capacitors have proven to be a solution but require a special effort in the fabrication of sub-micron circuits . Another option consists in applying the bias through the IF port. This option offers the advantages of both biasing the diode independently with different voltage level and bypass the need of circuitry near the diodes. Multilayer transmission line designs to obtain independent DC-paths for the diodes of an anti-parallel pair mixer have been proposed in.
Categories:
Detectors
Year:
2012
Session:
3
Full-text:
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Page Number(s):
16