Class A push-pull amplifier with bias controlling circuit

Details Class A push-pull amplifier with bias controlling circuit Class A push-pull amplifier with bias controlling circuit

1980-08-26

1982-10-26

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330267, 330270, 330273, H03F 330

Patent

active

043564526

ABSTRACT:
A class A complementary push-pull amplifier comprising first amplification means and second amplification means complementary in type to the first amplification means; first and second current detection means for detecting each output current of the first and second amplification means, each current detection means being coupled in serial relation with each other between output points of the first and second amplification means and a load of the push-pull amplifier being connected to a junction point of the first and second current detection means; comparator means for comparing a potential difference developed across the first current detection means and/or the second current detection means with a constant voltage to produce a control signal; and bias setting means for feeding bias current to the first and second amplification means in proportion to the control signal thereby to maintain the sum of output currents of the first and second amplification means constant. The amplifier so constructed can enjoy high thermal stability without the introduction of a conventional thermal coupling compensation as well as low distortion. One example of the applications of the amplifier may preferably be embodied in a Balanced Transformer Less amplifier.

REFERENCES:
patent: 3995228 (1976-11-01), Pass
patent: 4215318 (1980-07-01), Kawanabe
patent: 4306199 (1981-12-01), Kondou

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