Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1990-10-01
1992-01-07
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330301, 330292, H03F 345, H03F 316
Patent
active
050795147
ABSTRACT:
An operational amplifier is provided with an improved frequency compensation circuit, wherein a first compensation circuit inserts a first dominant pole at a first predetermined frequency for decreasing the magnitude of the ouput signal of the operational amplifier with increasing frequency, while a second compensation circuit inserts a pole and a zero at second and third predetermined higher frequencies in the transfer function of the operational amplifier, respectively, for stabilizing the first compensation circuit and ensuring the stability of the operational amplifier over the operational bandwidth. The pole and zero of the second compensation circuit inserts a positive phase shift about the third predetermined frequency effectively extending the phase response of the operational amplifier and allowing the frequency of the first dominant pole to be increased without sacrificing phase and gain margin. The higher frequency of the dominate pole provided by the first compensation circuit increases the gain-bandwidth product of the operational amplifier thereby improving its overall performance.
REFERENCES:
patent: 4524327 (1985-06-01), Masuda et al.
Atkins Robert D.
Motorola Inc.
Mottola Steven
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