TWI854198B - Transmission channel converter - Google Patents

Abstract

The present invention is a converter for transmission channels, which is characterized in that: a capacitor is set on the positive input line and the node is connected to a grounded resistor, and another capacitor is set on the negative input line and the node is connected to another grounded resistor. A level converter is connected to the output node of the bias generator and the positive input line respectively, and the output after conversion is connected to a receiving end device; another level converter is connected to the output node of the bias circuit and the negative input line respectively, and the output after conversion is connected to a receiving end device. After passing through the above-mentioned converter for transmission channels, it has the characteristics of fast response and low power consumption through the input control of the reference voltage.

Description

Transmission channel converter

The present invention is a converter which can quickly stabilize the voltage at the receiving end of a transmission channel.

The information transmission between two devices will generate noise due to the ground voltage difference between the two ends, and even the DC surge at the output end will cause signal interference at the receiving end, thereby affecting the receiving performance of the receiving end. At present, the method of resistor voltage division can be used to set capacitors in front of the receiving end, and connect a resistor and an input voltage, as well as another grounded resistor between the capacitor and the receiving device. By adjusting the input voltage, the surge noise can be eliminated, but the disadvantage is the high current consumption. There are also methods that replace the resistors in the above resistor voltage division with transistors for connection, which can reduce the current consumption, but the recovery response time is longer, which is not suitable for operations in high-speed environments.

The invention provides a converter for a transmission channel, including a capacitor, a resistor, a bias generator and a level converter. A capacitor is arranged on a positive input line and a node is connected to a grounded resistor, and another capacitor is arranged on a negative input line and a node is connected to another grounded resistor.

The bias generator is used to generate a biased voltage according to the input reference voltage. The bias generator includes a transistor, a transmission box semiconductor field effect transistor and a reference semiconductor field effect transistor. The positive terminal of the transistor is connected to a reference voltage, the box and drain of the reference semiconductor field effect transistor are grounded, and the source is connected to the negative terminal of the transistor and the drain node of the first transmission box semiconductor field effect transistor. A level converter is connected to the output node of the bias generator and the positive input line respectively, and the converted output is connected to a receiving device. Another level converter is connected to the output node of the bias circuit and the negative input line respectively, and the converted output is connected to a receiving device.

The present invention has a fast response performance through reference voltage input control, and requires low current and stable output level, which is particularly suitable for the needs of fast channels.

The present invention can further include an active inductor amplifier connected in parallel between the output of the level converter and the receiving end device. In this way, high-frequency characteristics are provided, which is particularly beneficial for use in high-speed transmission. Even at Giga Hz transmission speeds, it can also be stable, allowing high-speed small signals to pass through, meeting the requirements of a fast channel.

As shown in FIG. 1 , please refer to a high speed level shifter used in a transmission channel according to an embodiment of the present invention shown in FIG. 1 . When transmitting information in a high speed transmission channel, it has the advantages of fast noise removal and low current consumption.

As shown in FIG. 1 , this embodiment is used between a signal output device and a signal receiving device, and includes: capacitor C1, capacitor C2, resistor R1, resistor R2, bias generator 10, and a level converter 20.

Capacitor C1 is set on the positive input line and connected to resistor R1 at the node. Resistor R1 is grounded to form a Grounded ODT. Capacitor C2 is set on the negative input line and connected to resistor R2 at the node. Resistor R2 is grounded to form a Grounded ODT.

As shown in FIG2 , the bias generator 10 includes a transistor 11, a transmission box semiconductor field effect transistor 12, and a reference semiconductor field effect transistor 13. The positive terminal of the transistor 11 is connected to a reference voltage Vref, the box and drain of the reference semiconductor field effect transistor 13 are grounded, and the source is connected to the negative terminal of the transistor 11 and the drain node of the first transmission semiconductor field effect transistor 12.

Please refer to FIG3 . The level converter 20 is connected to the output node and the positive input line of the bias generator 10 respectively, and the converted output is used to connect to a receiving device. The level converter 20 is connected to the output node and the negative input line of the bias generator 10 respectively, and the converted output is used to connect to a receiving device. By using the result generated by the bias generator 10 as the reference voltage of the output end, it has the effect of filtering and blocking surges. Because the transistor responds quickly, when there is a surge or noise, only a small current is needed to quickly respond to the output, so that the signal can stably enter the receiving device end.

Furthermore, please refer to FIG. 4 , the present embodiment may further include an active inductor amplifier 30. The active inductor amplifier 30 is connected between the output of the level converter 20 and the receiving device. The active inductor amplifier 30 is connected between the output of the level converter and the receiving device. In this way, in addition to the gain of the circuit, a signal with high-frequency characteristics can be provided to pass through, which is particularly beneficial for use in high-speed transmission. At a transmission speed of gigahertz, a high-speed small signal can be amplified and transmitted to the receiving device.

In addition, the active inductor amplifier 30 in this embodiment is composed of a resistor and a semiconductor field effect transistor, and it can also be replaced by a combination of a rod and a resistor, which are all equivalent replacements of the present invention. In addition, the semiconductor field effect transistor mentioned in this embodiment can all be PMOS.

In summary, the present invention is a low-power, fast-response transmission converter that has an absolute improvement in gigahertz transmission speed and performance.

C1: Capacitor R1: Resistor C2: Capacitor R2: Resistor 10: Bias generator 11: Transistor 12: Transmitter FET 13: Reference FET 20: Level converter Vref: Reference voltage 30: Active inductor amplifier

Figure 1 is a circuit diagram of the present invention. Figure 2 is a circuit diagram of the bias generator of the present invention. Figure 3 is a circuit diagram of the level converter of the present invention. Figure 4 is a circuit diagram of the active inductor amplifier of the present invention.

C1: Capacitor

R1: resistor

C2: Capacitor

R2: resistor

10: Bias generator

20: Level converter

Vref: reference voltage

30: Active inductor amplifier

Claims (4)

A converter for a transmission channel, comprising: a capacitor connected in series to a positive input line, and a node on the positive input line connected to a resistor directly grounded; another capacitor connected in series to a negative input line, and another node on the negative input line connected to another resistor directly grounded; a bias generator, which is electrically connected to a reference voltage and then generates a biased signal; a level converter , respectively connected to an output node of the bias generator and only connected to the line of the positive input, and connected to the resistor directly grounded through the node; another level converter, respectively connected to another output node of the bias generator and only connected to the line of the negative input, and connected to the other resistor directly grounded through the other node, the converted output is connected to a receiving end device to convert the input signal. The converter for transmission channel as described in claim 1 further comprises two active inductance amplifiers, one active inductance amplifier is connected between an output end of one level converter and the receiving end device, and the other active inductance amplifier is connected between an output end of another level converter and the receiving end device. A converter for a transmission channel as described in claim 2, wherein the bias generator includes a transistor, a transmission box semiconductor field effect transistor, and a reference semiconductor field effect transistor, wherein the positive terminal of the transistor is connected to a reference voltage, a box and a drain of the reference semiconductor field effect transistor are grounded, and a source is connected to a negative terminal of the transistor and a drain node of the transmission box semiconductor field effect transistor. A converter for a transmission channel as described in claim 3, wherein the active inductor amplifier is composed of a semiconductor field effect transistor and a resistor in series.