Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1993-09-08
1995-01-17
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330257, 330261, H03F 345
Patent
active
053829174
ABSTRACT:
There is disclosed an amplifier circuit wherein a first differential amplifier consisting of an I/O circuit (11) and a constant-current circuit (31) and a second differential amplifier consisting of an I/O circuit (12) and a constant-current circuit (32) are connected to both first and second input terminals (1, 2), and current synthesizing circuits (21 to 24) synthesize the signals output from the first and second differential amplifiers to apply the synthesized signal to a current-to-voltage converter circuit (9), and wherein a clamp circuit (51) inhibits the operation of the first differential amplifier when the input signals at the input terminals (1, 2) are not less than (V.sub.cc -V.sub.sat), and a clamp circuit (52) inhibits the operation of the second differential amplifier when the input signals at the input terminals (1, 2) is not more than V.sub.sat. The second and first amplifiers substantially process the input signals which deviate from first and second ranges, respectively, to apply the output signal to the output terminal, thereby achieving the amplifier circuit having a wide input signal potential range.
REFERENCES:
patent: 4377789 (1983-03-01), Hoover
patent: 4532479 (1985-07-01), Blauschild
patent: 5294892 (1994-03-01), Ryat
Kamifuji Tsutomu
Miyake Hideki
Mitsubishi Denki & Kabushiki Kaisha
Mullins James B.
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