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Differential amplifier device, 2-stage amplifier device, and analog/digital converter device

A differential amplifier, digital converter technology, applied in the direction of analog-to-digital converter, differential amplifier, analog-to-digital conversion, etc., can solve the problems of reducing output resistance, reducing the gain of differential amplifier 101, etc., to improve the characteristics and increase the gain ratio. Effect

Active Publication Date: 2005-11-02
SONY CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this case, through the transistors T104, T105, the load circuit 103 becomes a diode-type load and reduces the output resistance so that the gain of the differential amplifier 101 is also reduced

Method used

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  • Differential amplifier device, 2-stage amplifier device, and analog/digital converter device
  • Differential amplifier device, 2-stage amplifier device, and analog/digital converter device
  • Differential amplifier device, 2-stage amplifier device, and analog/digital converter device

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Embodiment Construction

[0043] Hereinafter, an embodiment of an analog / digital converter according to the present invention will be described with reference to the accompanying drawings. In the following description, a sub-range type analog / digital converter is described, in which it is described that the device converts the analog signal into the upper 2 bits in the digital signal first, and then converts the analog signal into the lower 2 bits in the digital signal, Thus, all the analog signals are converted into 4-bit digital signals, but the specific embodiments of the present invention are not limited thereto.

[0044] Such as figure 1 As shown, the analog / digital converter 1 according to one embodiment of the present invention is configured to include: a sampling and holding circuit 2 for sampling and holding an analog signal; a reference voltage generation circuit 3 for generating a plurality of different reference voltages; A comparison circuit 4 for comparing the voltage of the analog sign...

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Abstract

A differential amplifier device is disclosed wherein the device comprises a differential amplifier circuit, a load circuit connected to the differential amplifier circuit; and a change-over switch connected to the load circuit for changing a gain of the differential amplifier circuit by switching between a full load where a whole of the load circuit is set to be the load of the differential amplifier circuit and a partial load where a part of the load circuit is set to be the load of the differential amplifier circuit, wherein the load circuit is configured to amplify an input signal and an output signal of the differential amplifier circuit in the full load.

Description

[0001] The present invention contains subject matter related to Japanese Patent Application JP 2004-126073 filed on Apr. 21, 2004 and JP 2005-032300 filed in the Japan Patent Office on Feb. 8, 2005, the entire contents of which are hereby incorporated by reference for reference. technical field [0002] The present invention relates to differential amplifiers, 2-stage amplifiers and analog / digital converters. Background technique [0003] With the recent development of digital equipment, analog / digital converters for converting analog signals into digital signals are widely used. [0004] In an analog / digital converter, a plurality of amplifiers are used to convert an analog signal into a digital signal by comparing an input analog signal with a multi-level reference voltage. [0005] Therefore, in the analog / digital converter, consider using a high-quality amplifier, especially a 2-stage amplifier with an offset compression function, in order to reduce the offset voltage w...

Claims

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Application Information

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IPC IPC(8): H03M1/14H03F1/02H03F3/45H03M1/12
Inventor 清水泰秀村山茂满工藤孝平
Owner SONY CORP
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