Equalizer and connector including the same
View Patent ↗An equalizer includes a first resistor and a capacitor connected in parallel. The positive terminal of the capacitor is connected to a signal transmission line on a blah printed circuit board. The negative terminal of the capacitor is connected to ground through a second resistor. A connector including the equalizer and a printed circuit board including the connector are also provided.
1. An equalizer using in a signal transmission line, the equalizer comprising:
a first resistor;
a capacitor comprising a positive terminal connected to the signal transmission line on a printed circuit board, and a negative terminal connected to ground through the first resistor; and
a second resistor connected in parallel with the capacitor;
wherein a resistance R 1 of the first resistor is calculated as follows:
R
1
=
R
2
*
(
1
-
10
A
/
20
)
10
A
/
20
,
A is a given low frequency gain, R 2 is a resistance of the second resistor; and
a capacitance C 1 of the capacitor is calculated as follows:
C
1
≥
R
1
+
R
2
2
π
FR
1
R
2
,
F is a main frequency of a signal transmitting through the signal transmission line.
2. The equalizer as claimed in claim 1 , wherein the capacitor is a variable capacitor.
3. The equalizer as claimed in claim 1 , wherein the second resistor is a variable resistor.
4. A connector, comprising:
one or more equalizers each used in a corresponding signal transmission line, each equalizer comprising:
a first resistor;
a capacitor comprising a positive terminal connected to the corresponding signal transmission line on a printed circuit board, and a negative terminal connected to ground through the first resistor; and
a second resistor connected in parallel with the capacitor;
wherein a resistance R 1 of the first resistor is calculated as follows:
R
1
=
R
2
*
(
1
-
10
A
/
20
)
10
A
/
20
,
A is a given low frequency gain, R 2 is a resistance of the second resistor; and
a capacitance C 1 of the capacitor is calculated as follows:
C
1
≥
R
1
+
R
2
2
π
FR
1
R
2
,
F is a main frequency of a signal transmitting through the signal transmission line.
5. The connector as claimed in claim 4 , wherein the capacitor is a variable capacitor.
6. The connector as claimed in claim 4 , wherein the second resistor is a variable resistor.
7. A printed circuit board, comprising:
a plurality of transmission lines;
a connector comprising:
one or more equalizers each corresponding to one of the plurality of transmission lines, each equalizer comprising:
a first resistor;
a capacitor comprising a positive terminal connected to the corresponding signal transmission line, and a negative terminal connected to ground through the first resistor; and
a second resistor connected in parallel with the capacitor;
wherein a resistance R 1 of the first resistor is calculated as follows:
R
1
=
R
2
*
(
1
-
10
A
/
20
)
10
A
/
20
,
A is a given low frequency gain, R 2 is a resistance of the second resistor; and
a capacitance C 1 of the capacitor is calculated as follows:
C
1
≥
R
1
+
R
2
2
π
FR
1
R
2
,
F is a main frequency of a signal transmitting through one of the plurality of signal transmission lines.
8. The printed circuit board as claimed in claim 7 , wherein the capacitor is a variable capacitor.
9. The printed circuit board as claimed in claim 7 , wherein the second resistor is a variable resistor.