This paper describes a simple new way of quantitatively evaluating the effects of narrow channel widths and short channel lengths on DD (deep depletion) MOSFETs. Deviations from the designed channel length (ΔL) and width (ΔW) can be obtained with this method. It can also be used to quantiatively evaluate the effects of narrow channel widths on buried-channel CCDs.
In applying the technique to a variety of devices fabricated by different processes, it was discovered that ΔW in the inverted LOCOS process is 1-1.5μm shorter than that in the LOCOS process. It was also found that the effect of narrow channel widths on CCDs was strongly dependent on annealing temperature. Finally, for CCDs fabricated with the pn isolation process, it was determined that ΔW increased linearly according to the logarithm of the boron dose used in the process.

View full abstract

Described is a new 1kW MF transmitter using a hybrid modulation system which can produce AM waves directly from digitalized audio signals by combining the outputs of switching-type RF power modules and an analogue-type RF power module.
The transmitter consists of 16 switching RF power modules, one analogue RF power module, a 12bit analogue-to-digital (A/D) converter, and a D/A converter which reconverts digital information (LSB group, 8 bits) back to analogue signals to modulate the analogue RF power module.
Putting all of these components together results in an AM transmitter with exceptionally high over-all efficiency (85% or more), reliability, signal-to-noise ratio of 72dB or better, and only about 0.4% total harmonic distortion at 80% modulation.

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract