Variable attenuator having voltage variable FET resistor with ch

Details Variable attenuator having voltage variable FET resistor with ch Variable attenuator having voltage variable FET resistor with ch

1988-05-10

1989-10-17

LaRoche, Eugene R.

Wave transmission lines and networks

Attenuators

307540, 307550, 307568, H01P 122

Patent

active

048750239

ABSTRACT:
A variable attenuator having first and second branch circuits configured in bridged T, T or PI topologies, each of the branch circuits having at least one voltage variable FET resistor. The voltage variable FET resistor includes a FET network comprising a plurality of FET segments each of which have a predetermined gate width and a voltage divider network including a plurality of fixed resistors coupled to the gates of the plurality of FET segments for providing a different predetermined gate voltage to each of the FET segments. The gate width of each of the FET segments and the resistance of each of the fixed resistors is chosen to provide a predetermined relationship between the control voltage and the channel resistance of the voltage variable FET resistor, to thereby provide a preselected relationship between the control voltage applied to the first branch circuit and the attenuation ratio of the attenuator.

REFERENCES:
patent: 3598908 (1971-10-01), Poulett
patent: 3968452 (1976-07-01), Sahara et al.
patent: 3977291 (1976-08-01), Southard
patent: 4004164 (1977-01-01), Cranford, Jr. et al.
patent: 4016481 (1977-04-01), Bradley
patent: 4039981 (1977-08-01), Ohashi et al.
patent: 4088943 (1978-05-01), Schmidt
patent: 4090139 (1978-05-01), Hoover
patent: 4093909 (1978-06-01), Watrous et al.
patent: 4121183 (1978-10-01), Murphy
patent: 4202238 (1980-05-01), Moog
patent: 4241316 (1980-12-01), Knapp
patent: 4244043 (1981-01-01), Fujita et al.
patent: 4255716 (1981-03-01), Takada
patent: 4257064 (1981-03-01), Colles
patent: 4317055 (1982-02-01), Yoshida et al.
patent: 4375596 (1983-03-01), Hoshi
patent: 4395643 (1983-07-01), Lehmann
patent: 4425515 (1984-01-01), Larson
patent: 4496909 (1985-01-01), Knapp
patent: 4546651 (1985-10-01), Merrick
patent: 4549098 (1985-10-01), Fushiki
patent: 4549197 (1985-10-01), Brehm et al.
patent: 4555788 (1985-11-01), Merrill
patent: 4562362 (1985-12-01), Stenbock
patent: 4605912 (1986-08-01), Naster et al.
patent: 4638190 (1987-01-01), Hwang et al.
patent: 4646028 (1987-02-01), Palmer
patent: 4649291 (1987-03-01), Konishi
patent: 4663584 (1987-05-01), Okada et al.
patent: 4686387 (1987-08-01), Rumelhard
patent: 4686451 (1987-08-01), Li et al.
patent: 4688113 (1987-08-01), Parsons
patent: 4700462 (1987-10-01), Beaubien et al.
patent: 4701722 (1987-10-01), Dolby
patent: 4719434 (1988-01-01), Scott et al.
Lizama, G. et al., 1-6 GHz GaAs MMIC Linear Attenuator with Integral Drivers, IEEE 1987 Microwave and Millimeter-Wave Monolithic Circuits Symposium, 1987.
Fisher, D. et al., A Linear GaAs MMIC Variable Attenuator, RF Design, Oct. 1987.

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