Nec Corporation

Nec Engineering, Ltd.

Noboru Kusama

Takashi Nakagawa

Noriko Sato

Masahiro Akiyama

Katsuya Kitada

In response to changes in an input binary digital signal, a 3rd order cosine pulse waveform, which, when it is changed in the increasing direction, has '0' level in a first period of T/12 (T corresponding to one-half cycle of the binary digital signal), is changed as a waveform of (h/2)(1+cos(3&#x3c0;t/T)+&#x3c0;/4) in the next period of 4T/12 (&#x2212;5T/12&#x2266;t&#x2266;&#x2212;T/12) and has an h (constant) level in the remaining period of T/12, and when it is changed in the reducing direction, has the h level in the first period of T/12, is changed as a waveform of (h/2)(1+cos(3&#x3c0;t/T)&#x2212;&#x3c0;/4) in the next period of 4T/12 (T/12&#x2266;t&#x2266;5T/12) and also has '0' level in the remaining period of T/12. By using this pulse wave, a flat part is generated in a time width of T/12 with respect to a judgment point. It is thus possible to improve the immunity to the effects of digital signal jitter, obtain change judgment with a sole single pulse and reduce the circuit scale and the power consumption.

Phase modulator

In an NPN type bipolar transistor, by employing AlGaAs or InGaAs having greater band gap than silicon, for an emitter and a base, doping amount of the emitter can be made smaller than that of the base to permit improvement of reverse withstanding voltage between the base and the emitter. Therefore, B class or C class bias can be used in a microwave band to improve efficiency.

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Tokyo, Japan

Noboru Kusama