Wave transmission lines and networks – Attenuators
Patent
1985-12-23
1987-02-24
Mullins, James B.
Wave transmission lines and networks
Attenuators
307264, 330134, 330145, 330280, 330284, H01P 122
Patent
active
046460365
ABSTRACT:
A circuit which attenuates an RF signal in response to a voltage level of a control signal is disclosed. A first PIN diode resides in series with an RF signal path, and a second PIN diode shunts the RF signal path to ground. A first differential amplifier responsive to the control signal drives the first PIN diode, and a second differential amplifier responsive to the control signal drives the second PIN diode. Gain and maximum current output for each of the amplifiers are independently controlled. Additionally, separate reference voltage sources may apply to one input of each of the differential amplifiers.
REFERENCES:
patent: 3222609 (1965-12-01), Ulmer et al.
patent: 3386034 (1968-05-01), Entwistle
patent: 3624561 (1971-11-01), Tongue
patent: 4019160 (1977-04-01), Kam
patent: 4236126 (1980-11-01), Weller et al.
patent: 4369414 (1983-01-01), Aoki et al.
Gresham Lowell W.
Motorola Inc.
Mullins James B.
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