Differential attenuator common mode rejection correction circuit

Details Differential attenuator common mode rejection correction circuit Differential attenuator common mode rejection correction circuit

1996-06-28

1998-08-18

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330303, 330305, H03G 330

Patent

active

057963088

ABSTRACT:
A differential attenuator is described that is capable of automatic calibration using electronically adjustable circuit elements. The differential attenuator has positive and negative inputs and outputs. A resistor and capacitor couple the positive side input and output, while a matching resistor and capacitor couple the negative side input and output. Shunt resistors and shunt capacitors coupled to the positive and negative outputs are augmented and made electronically adjustable by multipliers having their signal inputs coupled to the respective side output nodes. The outputs of one set of multipliers are coupled to the other ends of the shunt resistors, while their multiplication coefficients are controlled by a dc.sub.-- control signal. The outputs of another set of multipliers are capacitively coupled back to their respective side output nodes, while their multiplication coefficients are controlled by an ac.sub.-- control signal. Through the use of these controls a wide range of side-to-side component variations can be compensated to maximize the common mode rejection ratio achievable.

REFERENCES:
patent: 3343099 (1967-09-01), Paul
patent: 3702405 (1972-11-01), Zwirn et al.
patent: 4122398 (1978-10-01), Dunn
patent: 4507618 (1985-03-01), Nelson

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