Switched low-loss attenuator

Details Switched low-loss attenuator Switched low-loss attenuator

1990-08-28

1992-10-20

Voeltz, Emanual T.

Electricity: power supply or regulation systems

Including an impedance

Thermistor or resistor

333 81R, 330284, H01P 122, H03H 1124

Patent

active

051573237

ABSTRACT:
A double-.pi. network includes a pair of series resistors connected between input and output terminals. A plurality of FETs of different widths and/or in series with resistors, are each connected in parallel with one of the series resistors. Each FET is controlled jointly with an FET of the same gate size associated with the other series resistor, so that select ones of the FETs, or none may be conducting in parallel with the series in-line resistances. Another plurality of intermediate FETs having gates with different widths, are connected in parallel and separately controllable for coupling selectively the junction between the two in-line resistors to ground. Finally, an additional plurality of pairs of FETs couple the input and output terminals to ground. The FETs making up each pair have gates with the same width and are jointly controllable. The FETs in the different pairs have different widths and/or are in series with different sized resistors. By controlling operation of the FETs, different attenuation configurations, such as .pi., T, and double-.pi., are produced as well as different discrete attenuation levels.

REFERENCES:
patent: 4216444 (1980-08-01), Vergnolle et al.
patent: 4787686 (1988-11-01), Tajima et al.
patent: 4837530 (1989-06-01), Kondoh
Lemnois et al., "RF Missile Seeker Components Realized by ASMMIC Techniques", Microwave Journal, vol. 31, No. 6, Jun. 1988, pp. 167-176.
Tajima et al., "GaAs Monolithic Wideband (2-18 GHz) Variable Attenuators", IEEE MTT-S Digest, 1982, pp. 479-481.
Kondoh, "DC-50GHz MMIC Variable Attenuator with a 30dB Dynamic Range", IEEE MTT-S Symposium Digest, 1988, pp. 499-502.
Barta et al., "Surface-Mounted GaAs Active Splitter and Attenuator MMIC's Used in a 1-10-GHz Leveling Loop", IEEE Transactions on Microwave Theory and Techniques, vol. MTT-34, No. 12, Dec. 1986, pp. 1569-1575.
Gupta et al., "A 0.05-- to 14-GHz MMIC 5-Bit Digital Attenuator", GaAs IC Symposium, IEEE, 1987, pp. 231-234.
Hwange et al., "A Microwave Phase and Gain Controller with Segmented-Dual-Gate MESFETs in GaAs MMICs", IEEE MTT-S Monolithic Symposium, 1984, pp. 1-5.
Jones, "Digitally Controlled MMIC Attenuators-Techniques and Applications", Military Microwave Conference, 1988, pp. 217-222.

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