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Numerical control rheostat based on weighting switching network

A switching network and varistor technology, which is applied in the field of numerically controlled varistors based on weighted switching networks, can solve the problems of large layout area and high cost, and achieve the effects of reducing layout area, quantity and cost.

Inactive Publication Date: 2012-07-04
SHANGHAI BEILING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this digitally controlled rheostat requires N-2 N decoder and 2 N An analog switch, the cost is high, and the production layout area is large

Method used

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  • Numerical control rheostat based on weighting switching network
  • Numerical control rheostat based on weighting switching network
  • Numerical control rheostat based on weighting switching network

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0031] see Figure 3a and Figure 3b , are the actual circuit diagrams of the 3-bit binary code numerically controlled rheostat in the prior art and the present invention respectively. Figure 3a Among them, NOT gates (I0~I2, I10~I17), three-input NOR gates (I20~I27), etc. form a 3-8 decoder.

[0032] Because the 3-bit binary digital signal D2~D0 is received, the design requirements of the numerical control resistor 2 are as follows in Table 1:

[0033] D2~D0

Digitally controlled resistor resistance R AB

000

R

001

2R

010

3R

[0034] 011

4R

100

5R

101

6R

110

7R

111

8R

[0035] Table 1

[0036] It can be seen from Table 1 that the numerically controlled resistor 2 is designed as eight resistors R0-R7 with equal resistance and connected in series in sequence, and the two ends of the numerically controlled resistor 2 are A and B...

no. 2 example

[0049] see Figure 4a and Figure 4b , are the actual circuit diagrams of the 4-bit binary coded numerical control rheostat in the prior art and the present invention respectively. Figure 4a Among them, NOT gates (I0-I3, I10-I25), four-input NOR gates (I30-I45), etc. form a 4-16 decoder.

[0050] Because the 4-bit binary digital signal D3~D0 is received, the digitally controlled resistor 2 is designed as sixteen resistors R0-R15 with equal resistance and connected in series. The resistance value of RAB is RAB, and the weighted switch network 1 is the first, second, third and fourth analog switches K0~K3 connected in series in sequence. The four analog switches K0~K3 respectively correspond to 4-bit binary digital signals, and the obtained weights are respectively 1, 2, 4, 8, then connect them in parallel with 1, 2, 4, and 8 resistors respectively, and the parallel connection method is not limited. Figure 3b for one of:

[0051] The first analog switch K0 receives the fir...

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PUM

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Abstract

The invention discloses a numerical control rheostat based on a weighting switching network, which comprises the weighting switching network and a numerical control resistor. The weighting switching network receives an N bit binary digital signals, the N is a positive integer, the numerical control resistor comprises 2N resistors which have equal ohms and are sequentially connected in series, the weighting switching network comprises N analogue switches, each analogue switch receives one bit binary digital signals, obtains respective weight according to weight of the received binary digital signal and then is in parallel connection with the resistors which have the quantity equal to the weight and are sequentially in series connection, and each resistor is in parallel connection with one analogue switch at most. The numerical control variable resistance can be achieved by the weighting switching network formed by the N analogue switches only, and cost is greatly reduced.

Description

technical field [0001] The invention relates to a numerically controlled rheostat, in particular to a numerically controlled rheostat based on a weighted switch network. Background technique [0002] see figure 1 , the current numerically controlled rheostat generally converts the N-bit binary digital signal D N-1 ~D 0 Via N-2 N Decoder 1' produces 2 N Select 1 switch control signal Y (2 N -1)~Y0, respectively control the analog switch K(2 N -1)'~K0', to achieve the resistance value of the numerically controlled resistor 2' (the resistance value R between A and B AB ) with the N-bit binary digital signal D N-1 ~D 0 Changes, where the numerical control resistor 2' is 2 N A resistor R with the same resistance value and serially connected in sequence, and the two ends of the digitally controlled resistor 2' are respectively A and B two ends; 2 N an analog switch K (2 N -1) One end of '~K0' is connected to a resistor R respectively, and the other end of each is connec...

Claims

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Application Information

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IPC IPC(8): H01C10/06
Inventor 龙继志
Owner SHANGHAI BEILING
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