Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Reexamination Certificate
2000-11-03
2002-09-17
Shingleton, Michael B (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
C330S267000, C330S268000
Reexamination Certificate
active
06452451
ABSTRACT:
FIELD OF THE INVENTION
This invention generally relates to electronic systems and in particular it relates to complementary bipolar operational amplifiers.
BACKGROUND OF THE INVENTION
There are two paths from the input to the output of an output stage in a typical complementary bipolar operational amplifier. Usually each path has a slightly different frequency response which can cause some high frequency problems when designing video amps.
SUMMARY OF THE INVENTION
Generally, and in one form of the invention, the method for adjusting the output response of a complementary bipolar operational amplifier includes: providing a first bipolar transistor; providing a second bipolar transistor coupled to the first bipolar transistor; providing a first current source coupled to a base of the first bipolar transistor; providing a second current source coupled to a base of the second bipolar transistor; providing a third bipolar transistor coupled to the base of the first bipolar transistor; providing a fourth bipolar transistor coupled to the base of the second bipolar transistor; providing a first resistor coupled between a base of the third transistor and a common node; providing a second resistor coupled between a base of the fourth transistor and the common node; providing a capacitor coupled to the common node; providing a first input stage current source coupled to the third resistor; providing a second input stage current source coupled to the fourth resistor; and adjusting the first and second current sources and the first and second resistors to optimize the output circuit.
REFERENCES:
patent: 3487320 (1969-12-01), Heidecker et al.
patent: 6184750 (2001-02-01), Somerville
Corsi Marco
Gibson Neil
Milam Stephen W.
Brady III Wade James
Shingleton Michael B
Stewart Alan K.
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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