Bandwidth changing circuit

Details Bandwidth changing circuit Bandwidth changing circuit

1976-05-25

1977-06-14

Safourek, Benedict V.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

325490, 325344, 325408, 325387, 330126, 179 15BT, H04B 116

Patent

active

040300366

ABSTRACT:
A bandwidth changing circuit comprising first and second transistors connected in differential configuration, a narrowband filter whose output is connected to an input electrode of the first transistor, and a switching circuit. The switching circuit is responsive to a wideband designation voltage signal from a control voltage source to couple a wideband input signal source to an input electrode of the second transistor, and is responsive also to a narrowband designation voltage signal to couple the wideband input signal source to the input of the narrowband filter. The second transistor is biased normally conductive, while the first transistor is biased nonconductive in response to application of the wideband designation voltage signal to the input electrode thereof and biased conductive also in response to the narrowband designation voltage, thereby constituting a differential amplifier circuit together with the second transistor. The output of the bandwidth changing circuit is taken from an output electrode of the second transistor.

REFERENCES:
patent: 2969459 (1961-01-01), Hern
patent: 3633119 (1972-01-01), Balbes
patent: 3904948 (1975-09-01), Brinegar
patent: 3991374 (1976-11-01), Csicsatka et al.

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