Finally, this report compares the technological, physical parameters as well as the production cost and price of the Cascode JFET
Differential junction field effect transistor (JFET
) input stage of the amplifier.
The SiC JFET
is a high temperature component which has uses throughout a vehicle to include health monitoring in extremely hot environments.
The current gain for the circuit is supplied from a complementary common source amplifier using JFETs
. The engineers' choice of topology for the second gain stage is puzzling to me, because I do not see how this topology will yield lower closed-loop distortion than a traditional discrete op amp topology.
By using an approach analogous to that of Si CMOS SRAMs, complementary GaAs JFET
SRAM design has achieved SEU rates of [10.sup.-6] errors/bit-day for heavy ions.
Kodera, "Optimum Design of Triode-Like JFET
's by Two-Dimensional Computer Simulation," IEEE Trans.
MOSFET devices typically have higher flicker noise cutoff frequencies than JFET
or BJT devices.
Figure 2 shows JFET
input op amps such as Analog Devices AD8625/ AD8626/AD8627 and AD8641 /AD8642/ AD8643 that have input bias currents of less than 1 pA.
Other factors that enhance [V.sub.CE(on)] performance include enhanced accumulation-layer injection and elimination of the parasitic JFET
resistance inherent in the planar IGBT structure.