✦ LIBER ✦

An analytical investigation of the dispersion characteristic of a lightguide with an annular core cross section bounded by two cardioids

✍ Scribed by V. N. Mishra; Vivek Singh; B. Prasad; S. P. Ojha

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 105 KB
Volume: 23
Category: Article
ISSN: 0895-2477
DOI: 10.1002/(sici)1098-2760(19991120)23:4<221::aid-mop9>3.0.co;2-g

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✦ Synopsis

For the nonlinearized test, the IP is about 15 dB above the 3 compression point, and for the linearized test, the IP is 30 3 dB above the amplifier's compression point, thus providing an improvement of 15 dB.

IV. CONCLUSIONS

A simple, yet effective feedforward amplifier system with frequency tunability was developed. Low-cost variable attenu-Ž . Ž ators p-i-n diode and variable phase shifters variable ca-. pacitors were used to provide an accurate tuning for the operating bandwidth. This particular configuration offers 195 MHz bandwidth from 2.01 to 2.205 GHz. The signal cancellation in the first loop is more than 50 dB, and the overall IM cancellation performance of the whole system, when used with a class-A biased amplifier, can achieve an intermodulation cancellation of more than 60 dB.

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MoM solutions. In Section II, a few results at a moderately high frequency were presented, which showed excellent agreement between the standard MoM code and the hybrid method. These hybrid results, while interesting, are not new given the wide use and maturity of this technique. It was necessary, h

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Figure 3 Measured fundamental power and third-order IM power Ž . Ž . for P in s y20 dBm a before and b after employing the technique simulation shows that the third-order IM level at the output of a nonlinear amplifier can be reduced by the injection of a difference frequency in the amplifier togeth

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