Regardless of a commercial monolithic filter
balun with 4dB insertion loss and a slightly off-tuned sensor antenna with -12 dBi gain at 2.4 GHz, the sensor placed at 0.3 mm from the body achieved one meter transmission distance.
The on-chip synthetic TL, which is loaded by the capacitors and the degenerated cross-coupled pair, implements the composite resonators in the monolithic filter .
[L.sub.RF] and [L.sub.gnd] represent the inductances of the bondwires at two RF ports and the ground of the monolithic filter. [L.sub.gnd] and the capacitive characteristic of the composite resonator cause the series resonance, generating the additional transmission zero above the passband to disturb the stopband suppression .
The first system of this kind, introduced last year and currently available on Peugeot models 607 HDi 2.2 and 406 HDi 2.2, utilizes cerium-based fuel borne catalyst (a fuel additive) and an uncatalyzed monolithic filter
. The active regeneration strategy is based on increasing the exhaust temperature through common-rail post injection in conjunction with an oxidation catalyst.
Seevinck, "Companding current-mode integrator: A new circuit principle for continuous-time monolithic filters
Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters
, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, and many other analog functions.
Active resonators have the obvious advantages of small size and high Q-factor for monolithic filters
. However, active resonators reported previously for MMIC filters have tended to use fairly complex topologies that require many power supply lines for different settings of transistor and varactor bias voltages.