Amplifier having single-ended input and differential output and

Details Amplifier having single-ended input and differential output and Amplifier having single-ended input and differential output and

1996-06-21

1998-06-16

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including balanced to unbalanced circuits and vice versa

330278, 330288, H03F 330, H03G 330

Patent

active

057676623

ABSTRACT:
An amplifier (40) includes a biasing element (59) which establishes a quiescent current in two transistors (62, 72). An input voltage signal is converted to an input current signal by a voltage to current converting element (65). The input current signal differentially modulates the currents in the two transistors (62, 72). The differentially modulated currents generates differentially modulated voltages across two diodes (76, 78). Two buffers (83, 87) generates a differential output voltage signal at two output terminals (77, 79) of the amplifier (40) by shifting the differentially modulated voltages across the two diodes (76, 78). The output signal of the amplifier (40) has a low DC offset. The gain of the amplifier (40) is adjusted by adjusting the quiescent current in the two transistors (62, 72).

REFERENCES:
patent: 3573645 (1971-04-01), Wheatley, Jr.
patent: 4001706 (1977-01-01), Prins et al.
patent: 4049977 (1977-09-01), Radovsky
patent: 4485351 (1984-11-01), Schemmel et al.
patent: 4956615 (1990-09-01), Bohme
Steven O. Smith, 1993 IEEE International Symposium on Circuits and Systems, "The Good, the Bad and the Ugly: Current Feedback--Technical Contributions and Limitations", Vol. 2 of 4, pp. 1058-1061.
Barry Harvey, 1993 IEEE International Symposium on Circuits and Systems, "Current Feedback Opamp Limitations: A State-of-the-Art Review", Vol. 2 of 4, pp. 1066-1069.

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