Designs utilize high performance GaAs Schottky Barrier Beam Lead
Diodes in balanced configurations that require a +13 dBm LO drive and display low levels of conversion loss.
The detector circuitry utilizes high performance GaAs Schottky Barrier Beam lead
diodes with very low junction capacitance.
[18.] Jose, S., "HPND-4005 beam lead
PIN diode, Datasheet," Avago Technologies, CA, 2006.
D1 and D2 are the beam lead
PIN diodes (MPND-4005) mounted in a 3 dB Lange coupler.
A beam lead
diode installed using a proprietary technique reduces the series inductance and provides a significant improvement in performance.
It is also cost effective to assemble, with semiconductors included in either beam lead
or coplanar flip-chip form, and allows for the inclusion of MMICs at a later date when available.
A balanced beam lead
mixer combines the RF and LO signals to give a 10 GHz bandwidth IF.
The input section is a patch antenna, including a [lambda]/4 choke circuit to suppress RF leakage, etched on a thin teflon substrate with a beam lead
diode bonded across the gap in the antenna.
Leadless Monolithic Devices are Drop-In Replacements for Beam Lead
The MEDL DC 1338 mixer diodes employed in this mixter exhibited the following parameters (typical of high performance mm-wave beam lead
devices): C.sub.jo = 0.04 pF (zero bias junction capacitance) R.sub.s = 7 [omega] (series resistance) n = 1.1 (ideality factor) C.sub.p = 0.04 pF (beam lead
package parasitic capacitance) [phi] = 0.8 (GaAs contact potential) I.sub.s = 2.25 x 10.sup.-14 (saturation current) L.sub.p = 0 (negligible package parasitic inductance).
'Joining these dissimilar materials in a conventional way with a static laser beam leads
to hot cracks and bubbles in the melt pool, which decreases the quality of the weld,' he explained.