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Variable impedance network for integrated circuit

An impedance network and resistance technology, applied in impedance networks, networks using active components, multi-terminal pair networks, etc., can solve the problem of inconvenient manual adjustment of potentiometers

Inactive Publication Date: 2010-05-12
NUVOTON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When data processing is operated through an external electronic circuit, the potentiometer needs to be adjusted continuously, and for the circuit under the control of the external electronic circuit of the data processing system, manual adjustment of the potentiometer is extremely inconvenient

Method used

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  • Variable impedance network for integrated circuit
  • Variable impedance network for integrated circuit
  • Variable impedance network for integrated circuit

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Embodiment Construction

[0013] In view of the above-mentioned state of being in doubt about known variable impedance networks, the present invention provides alternative embodiments of variable impedance networks that reduce excessive circuitry including potentiometer wiper transistors. , and advantages can be more clearly understood, the following preferred embodiments are described in detail with accompanying drawings, but the present invention is not limited thereto.

[0014] What is shown in Fig. 1 (A) is about a known variable resistance network 100, this variable resistance network 100 comprises counter 102, control circuit 104, decoder 106 and network array 108, wherein network array 108 comprises transistor array 110 and resistor array 112 . In the example shown, the network array 108 has three terminals (terminals), which are H, L and W respectively. Therefore, the network array 108 is an analog standard potentiometer 120 as shown in FIG. 1(B), wherein, when When terminal W is the center ta...

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Abstract

The variable impedance network is used in constituting potentiometer and DA converter. Compared with common method, the impedance network has less circuits, including reduced transistors and tapping number for potentiometer.

Description

technical field [0001] The invention relates to a variable impedance network, in particular to a variable impedance network used in integrated circuits. Background technique [0002] A variable impedance (impedance) network is usually manually adjusted to provide a selectable impedance in order to affect a certain temporal state of the circuit in which the network is located. These variable impedance networks are usually formed by variable resistors (resistor), also known as potentiometers (Potentiometer), but the circuit variable impedance networks formed by variable inductance or capacitance. [0003] When data processing is operated through an external electronic circuit, the potentiometer needs to be adjusted continuously, and for the circuit under the control of the external electronic circuit of the data processing system, manual adjustment of the potentiometer is extremely inconvenient. Because data processing systems often must change the value of the variable imped...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H7/00H03H11/00
Inventor 哈葛波·A·纳萨恩
Owner NUVOTON