Bias sharing an electronic switch and an active device

Details Bias sharing an electronic switch and an active device Bias sharing an electronic switch and an active device

1985-05-06

1986-12-16

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Selective or optional sources

307 43, 331177R, 331179, H02J 500

Patent

active

046299068

ABSTRACT:
In radio frequency applications where energy is coupled between an oscillator device and a reactive load to alter the frequency of the energy at the device, or if coupling of the energy is selectively provided to a plurality of outputs, a PIN diode can be used to electrically switch the coupling of this energy. A significant reduction in current drain can be gotten by using the PIN diode in series with the active device which is amplifying the energy. A current source is used for forward biasing the PIN diode. The same forward bias current is used to bias the active device, saving an additional bias current for the active device. Biasing of the active device, while the PIN diode is reverse biased, is accomplished by an alternate current supply source. Control of each current supply device yields an inverse switching function to selectively couple energy at the active device. When the PIN diode is forward biased, the energy at the active device is coupled to the output or to the reactive load, which alters the frequency of the energy.

REFERENCES:
patent: 2930991 (1960-03-01), Edwards
patent: 3295070 (1966-12-01), Tewksbury et al.
patent: 3416100 (1968-12-01), Kruse et al.
patent: 3562597 (1971-02-01), Winston
patent: 3633128 (1972-01-01), Sevilla
Motorola Service Manual, 68P81044E40 PEPS30606--7/20/80.

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