Telecommunications – Receiver or analog modulated signal frequency converter – With wave collector
Patent
1997-01-24
1999-01-19
Le, Thanh Cong
Telecommunications
Receiver or analog modulated signal frequency converter
With wave collector
455283, 333 81R, 333103, H04B 144
Patent
active
058624643
ABSTRACT:
It is an object of the present invention to provide a variable attenuator which can be produced at a low cost and can suppress production of unnecessary resonance and propagation. When the radio frequency resistance values of PIN diodes 13 and 14 are higher than a characteristic resistance value of a signal line interconnecting radio frequency signal input terminal 1 and radio frequency signal output terminal 2, the sum of voltages applied to PIN diode 11 and PIN diode 13 and the sum of voltages applied to PIN diode 12 and PIN diode 14, that is, V3, are controlled so as to be fixed. But when the radio frequency resistance values of PIN diodes 13 and 14 are lower than the characteristic resistance value of the signal line, the currents to flow through PIN diodes 13 and 14 are fixed to such values with which the radio frequency resistance values and the characteristic resistance value of the signal line are equal to each other while only the currents to flow through PIN diodes 11 and 12 are controlled to vary the attenuation amount.
REFERENCES:
patent: 4590417 (1986-05-01), Tanaami et al.
patent: 4668882 (1987-05-01), Matsuura
patent: 5220679 (1993-06-01), Zametzer et al.
patent: 5748054 (1998-05-01), Tonegawa et al.
Cong Le Thanh
NEC Corporation
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