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Differential circuits

A differential circuit and current 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: 2010-12-08
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This works, but increases the component count

Method used

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Embodiment Construction

[0036] 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.

[0037] 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 . Single-transistor current mirror circuits through switches S driven by non-overlapping clock signals Φ1 and Φ2, 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 .

[0038] The operation of the circuit is as follows:...

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Abstract

A single transistor current-mirror is interfaced with a suitable load in combination with a suitable set of switches to accomplish a comparator function. In particular, the differential circuit comprises a single transistor current mirror, including a capacitor connected to the transistor by a switch, and two current sources connected to the current mirror by respective and independent switches, the switch of one of the current sources being operated together with the capacitor switch so as to charge the capacitor and the switch of the other current source being operated so that the circuit operates as a source-follower amplifier with a current-source load. The comparator function is, thus, not influenced by the spatial distribution of the characteristics of the transistors used to implement the circuit.

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