Multiple switchable input LNA with input impedance control

Details Multiple switchable input LNA with input impedance control Multiple switchable input LNA with input impedance control

1997-09-17

1999-06-22

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Nonlinear amplifying circuit

455341, 455310, 455137, G06G 712

Patent

active

059146346

ABSTRACT:
An amplifier circuit has an amplifying transistor which is switched on and off by a switching transistor under control of a control signal selectively applied to the switching transistor. In this way a selection is made whether or not to amplify an input signal on an antenna. The switching transistor forms part of the biasing circuit for the amplifying transistor such that when the switching transistor is on the amplifying transistor is biased off. A PIN diode and series resistor are together connected in shunt across the switching transistor such that the bias voltage which causes the amplifying transistor to be off causes the PIN diode to be forward biased thereby causing the antenna to be terminated with the resistor the value of which may be chosen to be 50 ohms.

REFERENCES:
patent: 4654885 (1987-03-01), Meszko et al.
patent: 4761828 (1988-08-01), Rinderle
patent: 5212829 (1993-05-01), Brinkhaus
patent: 5625365 (1997-04-01), Tom et al.
"Low-Current RFIC Downconverter", pp. 1-14, (1994), TriQuint Semiconductor.
Mohindra, "Isolator For DECT Open Loop Modulation", RF Synthesizers, pp. 30-42, (1996).

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