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Integrated circuit single ended-to-differential amplifier

A technology of integrated circuits and amplifier circuits, applied in the field of single-ended to differential amplifier circuits, which can solve the problems of limiting the low-frequency pole of the filter and limiting the signal processing quality of the filter

Inactive Publication Date: 2012-03-21
FAIRCHILD SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By providing a conventional filter on-chip with or near a power supply or other circuitry, the signal processing quality of the filter may be limited due to distortion caused by the power supply or other circuitry, as well as the ability of the filter to provide low frequency poles ability

Method used

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  • Integrated circuit single ended-to-differential amplifier
  • Integrated circuit single ended-to-differential amplifier
  • Integrated circuit single ended-to-differential amplifier

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Embodiment Construction

[0013] Integrated circuits have been miniaturized to accommodate the passive components associated with the circuit, including capacitors and the capacitance of those capacitors. Capacitors and impedance devices, such as resistors, may be used in filter circuits, for example to establish the poles of the filter. The poles of a filter provide an indication of the circuit's ability to pass or reject specific signal frequencies. For circuits that require low frequency poles, the reduced capacitance levels of integrated circuits require more area for capacitors or more area for larger impedance devices. The present invention develops a high impedance network for integrated circuits to provide extremely high impedance with a very small chip area. High impedance devices can be used in on-chip filter circuits with very low frequency poles. Such poles can be on the order of fractions of a hertz. The small size of the high impedance network allows the use of integrated circuits with...

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Abstract

Apparatus and methods for an integrated circuit, single ended-to-differential amplifier are provided. In an example, the amplifier can include an amplifier circuit having a first input configured to receive a single-ended signal, a second input, and a differential output configured to provide an amplified representation of the single-ended signal. The amplifier can include a filter circuit configured to balance a common-mode voltage between the first and second inputs of the amplifier circuit. The filter circuit can include a common-mode input configured to receive the common-mode voltage, a first impedance network coupled between the common-mode input and the first input of the amplifier circuit, and a second impedance network coupled between the common-mode input and the second input of the amplifier circuit. The filter circuit can provide a low frequency pole below 1 hertz.

Description

technical field [0001] The subject matter of the present invention relates generally to amplifier circuits and, more particularly, to methods and apparatus for single-ended to differential amplifier circuits. Background technique [0002] Typically, a sensor circuit receives an electrical signal from a transducer. The sensor circuit then amplifies the received signal to the required level for processing. In some sensor circuits, the signal is biased and amplified to provide a differential output. Noise on the power supply, for example on the common-mode power supply used for the bias signal, may interfere with the reception and amplification of the received sensor signal. In some sensor circuits, filters are often used to pass signals with specific frequencies of interest. By providing a conventional filter on-chip with or near a power supply or other circuitry, the signal processing quality of the filter may be limited due to distortion caused by the power supply or othe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45
CPCH03F3/45475H03F2203/45138H03F3/45928H03F3/45H03F3/10
Inventor 安德鲁·M·乔丹哈维耶·雅撒
Owner FAIRCHILD SEMICON CORP
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