Resonator coupled differential amplifier

Details Resonator coupled differential amplifier Resonator coupled differential amplifier

1981-11-09

1983-04-26

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including frequency-responsive means in the signal...

330174, 330252, 330311, H03F 3191

Patent

active

043814875

ABSTRACT:
In differential amplifier circuits of the type having first and second transistors, the emitter of each transistor is connected to a different current source and the emitters are coupled by a ceramic filter tuned to 455 KHz. In one embodiment, wherein the transistors have symmetrical resistive loads, an inductor is connected across the filter to tune out capacitance across the terminals of the filter. In another embodiment, the circuit includes an unbalanced and complex load. In yet another embodiment, the circuit has active load circuitry and an inductor is connected across the filter to tune out capacitance across the terminal of the filter.

REFERENCES:
patent: 2510868 (1950-06-01), Day
patent: 2833924 (1958-05-01), Tongue
patent: 3916344 (1975-10-01), Enderly
patent: 3979693 (1976-09-01), Saari
patent: 3996530 (1976-12-01), Feister et al.
patent: 4227156 (1980-10-01), Mattfeld
"Ceramic Filter BFU455 Technical Data," Murata Manufacturing Co. Ltd., Jul. 7, 1976.
"MC1596 Balanced Modulator," Application Note AN-531 of Motorola Semiconductor Products, Inc., .COPYRGT.1971.

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