Linear differential gain stage

Details Linear differential gain stage Linear differential gain stage

1996-05-03

1998-03-17

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330149, 330 76, 330260, 330292, H03F 345, H03F 114

Patent

active

057291764

ABSTRACT:
A linear differential gain stage (31) has a first input (32), a second input (33), a first output (34), and a second output (35). A differential input voltage is coupled to an input differential transistor pair (39,40). Voltage compensation circuits (53,54) cancel non-linearities due to the input differential transistor pair (39,40). Parasitic capacitance of the input differential transistor pair (39,40) couple current to the first and second inputs (32,33) due to voltage transitions at the first and second outputs (34,35). The current to the first and second inputs (32,33) is canceled by impedance compensation circuits (55,56) that provide an equal magnitude but opposite sign current. The result is an almost infinite input impedance to the linear differential gain stage (31).

REFERENCES:
patent: 4390848 (1983-06-01), Blauschild
patent: 4763024 (1988-08-01), Gay
patent: 5365191 (1994-11-01), Hayashi
patent: 5453718 (1995-09-01), Kurokawa
patent: 5493254 (1996-02-01), Fairgrieve

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