Cesium triborate (CsB3O5) is expected to be an efficient harmonic generator in the UV region. However, as-grown single crystals of CsB3O5 often contain a high density of optical scattering centers that significantly reduce device performance. We found that these can be removed by a post-growth heat treatment with quenching. Treated crystals were employed for the third harmonic generation of a high-power Nd:YAG laser operating at 1064 nm. We generated high-power 355-nm output power of 14 W, which is three times higher than that obtained by a commercial LiB3O5 crystal under the same experimental conditions.

A 2GHz band even harmonic type direct conversion receiver (EH-DCR) is proposed for the W-CDMA mobile terminal. Because of the well-matched antiparallel diode pair used in proposed EH-DCR, the proposed receiver can reduce even order mixing products that degrade sensitivity characteristics. Also the proposed EH-DCR can achieve low current consumption with a passive mixer approach. In this paper, the overall receiver with a RF block, an analog baseband IC (ABB-IC) and a demodulator is demonstrated to indicate effectiveness on the proposed RF architecture. Described evaluation results indicate high instantaneous dynamic range with high sensitivity.

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A 0.6 um BiCMOS Analog Baseband I C that enables a direct conversion W-CDMA receiver is described, Two diversity Y Q channels provide 87 dB of voltage gain, controllable in 1-dB steps. A 2 Mllz Low Pass Filter, synchronized to an external RC network, provides an accurate rejection mechanism against adjacent channel interference. A log amp provides a "Fast-RSS1" function for rapidly selecting gain settings. Low DC current (<5mA / path), low input noise (<4 nV/ 11z

Abstruct -This paper presents a novel even harmonic mixer using self-biased anti-parallel diode pair (APDP). Resistors for self-bias are employed in APDP, and voltage differences in D.C. arise at each diode when LO power is applied. As increasing of LO power, voltage differences become larger, so maximum voltages of LO wave added to each diode are almost constant and conversion loss of the mixer is kept constantly. In the developed L-band even harmonic mixer using self-biased APDP for a direct conversion receiver, fluctuation of voltage conversion gain is below 1dB with LO power of from OdBm to14dBm.