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

A technology of differential amplifiers and digital converters, applied in the direction of analog-to-digital converters, differential amplifiers, analog-to-digital conversions, etc., can solve the problems of reducing output resistance and gain reduction of differential amplifier 101, and achieve improved characteristics and increased gain ratios Effect

Active Publication Date: 2009-04-29
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, one embodiment of the analog / digital converter according to the present invention will be described with reference to the drawings. In the following description, a sub-range analog / digital converter is described, in which the device is described by first converting the analog signal into the high 2 bits of the digital signal, and then converting the analog signal into the low 2 bits of the digital signal, Thus, all analog signals are converted into 4-bit digital signals, but the specific embodiment of the present invention is not limited to this.

[0044] Such as figure 1 As shown, the analog / digital converter 1 according to an 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 generating circuit 3 for generating a plurality of different reference voltages; The comparison circuit 4 is used to compare the voltage of the analog signal with a plurality of di...

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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 the subject matter related to the Japanese patent application JP 2004-126073 filed on April 21, 2004 and the Japanese patent application JP 2005-032300 filed in the Japanese Patent Office on February 8, 2005, the entire contents of which are incorporated herein by reference. for reference. Technical field [0002] The invention relates to a differential amplifier, a 2-stage amplifier and an analog / digital converter. Background technique [0003] With the recent development of digital equipment, analog / digital converters for converting analog signals into digital signals have been widely adopted. [0004] In the analog / digital converter, the analog signal is converted into a digital signal by comparing the input analog signal with a multi-level reference voltage, thereby using multiple amplifiers. [0005] Therefore, in the analog / digital converter, consider using a high-quality amplifier, especially a 2-stage amplifier with offset compression ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/02H03F3/45H03M1/34H03M1/14H03M1/12
Inventor 清水泰秀村山茂满工藤孝平
Owner SONY CORP
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