Attenuator

Details Attenuator Attenuator

2008-01-23

2010-11-23

Jones, Stephen E (Department: 2817)

Wave transmission lines and networks

Attenuators

C327S308000

Reexamination Certificate

active

07839233

ABSTRACT:
A π-type voltage-controlled variable attenuator is disclosed. The variable attenuator may include variably resistive components in the series and shunt arms. The variably resistive components may be implemented as field effect transistors. The shunt arms may be coupled to the series arm, and the variable attenuator may lack capacitors between the series arm and shunt arms. The series arm and shunt arms may display variable resistances which, in combination, operate to provide a variable level of attenuation of an input signal. The variable attenuator may provide any level of attenuation of an input signal over a wide frequency range. The variable attenuator may be implemented as an integrated circuit.

REFERENCES:
patent: 4837530 (1989-06-01), Kondoh
patent: 5903177 (1999-05-01), Schwab et al.
patent: 6448867 (2002-09-01), Kossor
patent: 6919774 (2005-07-01), Ritchey et al.
Inamori, M. et al., “A New GaAs Variable Gain Amplifier MMIC with a Wide-Dynamic-Range and Low-Voltage-Operation Linear Attenuation Circuit,” MOM3-3,IEEE Radio Frequency Integrated Circuits Symposium, (1999) pp. 39-42.
Sun, H. J. et al., “A 2-18GHz Monolithic Variable Attenuator Using Novel Triple-Gate Mesfets,”IEEE MTT-S Digest, (1990) pp. 777-780.

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