SELF-CORRECTING AMPLIFIER SYSTEM
First Claim
1. A battery testing device to automatically compensate for DC offsets arising from the battery testing device, comprising:
- an input terminal to receive an excitation response signal comprising a DC bias and an AC response;
an op amp coupled to receive and to amplify the response signal, the op amp introducing internal errors manifested in the amplified response signal;
a servo integrator coupled to receive the amplified response signal and to determine the DC bias and a rate of change of the amplified response signal, and in response, to produce a servo feedback signal to compensate for the DC bias;
a correction circuitry, coupled to receive the servo feedback signal and to output a correction current to the op amp, and to produce the correction current in order to remove the DC bias;
an error sensing device, coupled to receive the correction current and to output a feedback control signal, to adjust for the internal errors introduced by the correction circuitry; and
an output terminal to output a corrected AC signal.
2 Assignments
0 Petitions
Accused Products
Abstract
DC offsets introduced in battery testing equipment are automatically compensated for using complementary current-mode servo feedback. An op amp receives and amplifies a response signal, while also introducing internal errors manifested in the amplified response signal. A correction circuitry coupled to receive the amplified response signal and comprising a balanced circuit with a positive input correction device and a negative input correction device to remove the DC bias. The correction circuitry further comprises an error sensing device to correct for the internal errors introduced by the op amp.
13 Citations
14 Claims
-
1. A battery testing device to automatically compensate for DC offsets arising from the battery testing device, comprising:
-
an input terminal to receive an excitation response signal comprising a DC bias and an AC response; an op amp coupled to receive and to amplify the response signal, the op amp introducing internal errors manifested in the amplified response signal; a servo integrator coupled to receive the amplified response signal and to determine the DC bias and a rate of change of the amplified response signal, and in response, to produce a servo feedback signal to compensate for the DC bias; a correction circuitry, coupled to receive the servo feedback signal and to output a correction current to the op amp, and to produce the correction current in order to remove the DC bias; an error sensing device, coupled to receive the correction current and to output a feedback control signal, to adjust for the internal errors introduced by the correction circuitry; and an output terminal to output a corrected AC signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A method in a battery testing device to automatically compensate for DC offsets arising from the battery testing device, comprising:
-
receiving an excitation response signal comprising a DC bias and an AC response; amplifying the response signal with an op amp, the op amp introducing internal errors manifested in the amplified response signal; determining the DC bias and a rate of change of the amplified response signal to, in response, produce a servo feedback signal that compensates for the DC bias; producing a correction current for the op amp from the servo feedback signal in order to remove the DC bias; adjusting the correction current for internal errors sensed in the correction circuit with a feedback control signal; and outputting a corrected response signal.
-
Specification