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Differential circuits

A differential circuit and current source technology, applied in differential amplifiers, televisions, multiple input and output pulse circuits, etc., can solve the problem of increasing the number of components

Inactive Publication Date: 2006-01-11
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This works, but increases the component count

Method used

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Embodiment Construction

[0035] Embodiments of the present invention will now be described in relation to differential comparator circuits. Subsequently, a method of converting this circuit into a differential voltage comparator will be explained.

[0036] Figure 5 a shows a method according to an embodiment of the invention. The single-transistor current mirror includes the transistor T 1 , where capacitor C 1 connected between its source and gate, and the switch S 3 connected between its gate and drain. The switch S is operated by the control signal 3 . A single-transistor current mirror circuit through switches S driven by non-overlapping clock signals Ф1 and Ф2, respectively 10 and S 11 , and the sink current I REF and I SEN The two current sources are connected. The control signal to the single-transistor current mirror circuit is connected to Φ1. The output of this circuit is at node C and the voltage at this node is called V C .

[0037] The operation of the circuit is as follows...

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PUM

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Abstract

A single-transistor current mirror interfaced with an appropriate load, in combination with an appropriate set of switches, implements the comparator function. Specifically, the differential circuit includes a single-transistor current mirror comprising a capacitor connected to the transistor through a switch and two current sources connected to the current mirror through respective independent switches, one of the current sources being operated with a capacitor switch to charge the capacitor and to operate the switch of the other current source so that the circuit operates as a source follower amplifier with a current source load. Therefore, the spatial distribution of transistor characteristics does not affect the comparator function.

Description

technical field [0001] The present invention relates to a differential circuit. For example, such differential circuits are used in a wide range of electronic devices including active matrix display devices. Background technique [0002] figure 1 (a) and 1(b) respectively give the circuit symbol and graphic definition of the traditional differential voltage comparator. output voltage V OUT with nodes P and N (ie, V P and V N ) The relationship between the two input voltages is as follows: [0003] V OUT = V DD if ( V P - V N - V OS ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K5/08G11C27/02H03F3/45H03K5/24H04N25/00
CPCH03K5/249G11C27/028
Inventor 西蒙·塔姆
Owner SEIKO EPSON CORP
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