FT quadrupler amplifier with linearity correction

Details FT quadrupler amplifier with linearity correction FT quadrupler amplifier with linearity correction

1988-02-01

1989-02-14

Mullins, James B.

Amplifiers

Hum or noise or distortion bucking introduced into signal...

330252, 330311, H03F 345

Patent

active

048049263

ABSTRACT:
An f.sub.T quadrupler amplifier improves the frequency response beyond that which is possible with an f.sub.T doubler, yet retains precise nonlinearity correction.
Voltage to current conversion is achieved by two parallel differential transconductance signal amplifiers. Two of the inputs of the signal amplifiers are coupled together to form one main differential input, whereas the other two inputs are coupled together and to ground or to a reference voltage. The outputs of the signal amplifiers are cross coupled to form a main differential current output. A parallel differential transconductance error amplifier is provided which senses an error voltage generated by the main signal amplifiers. A corresponding error correction current is generated by the parallel error amplifier and returned to the parallel signal amplifiers. This error correction current substantially reduces nonlinearities in the output current of the signal amplifiers.

REFERENCES:
patent: 4267516 (1981-05-01), Traa

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