Differential signal transmission circuit
There is provided a differential signal transmission circuit that includes a first output terminal, a second output terminal connected to the first output terminal via a load resistor, a high-side transistor formed of a p-channel MOSFET and connected between an application terminal of a power supply voltage and the first output terminal, a low-side transistor formed of an n-channel MOSFET and connected between an application terminal of a ground potential and the second output terminal, a high-side pre-driver configured to drive the high-side transistor, a low-side pre-driver configured to drive the low-side transistor, a first resistance part connected between an output end of the high-side pre-driver and a gate of the high-side transistor, and a second resistance part connected between an output end of the low-side pre-driver and a gate of the low-side transistor.
1. A differential signal transmission circuit, comprising:
a first output terminal;
a second output terminal connected to the first output terminal via a load resistor;
a high-side transistor formed of a p-channel MOSFET and connected between an application terminal of a power supply voltage and the first output terminal;
a low-side transistor formed of an n-channel MOSFET and connected between an application terminal of a ground potential and the second output terminal;
a high-side pre-driver configured to drive the high-side transistor;
a low-side pre-driver configured to drive the low-side transistor;
a first resistance part connected between an output end of the high-side pre-driver and a gate of the high-side transistor;
a second resistance part connected between an output end of the low-side pre-driver and a gate of the low-side transistor;
a high-side diode having an anode connected to a drain of the high-side transistor and a cathode directly connected to the first output terminal;
a low-side diode having a cathode connected to a drain of the low-side transistor and an anode directly connected to the second output terminal;
a high-side resistor having one end connected only to the application terminal of the power supply voltage and another end connected only to a source of the high-side transistor; and
a low-side resistor having one end connected only to the application terminal of the ground potential and another end connected only to a source of the low-side transistor.
2. The differential signal transmission circuit of claim 1 , wherein the first resistance part and the second resistance part are devices having a same composition.
3. The differential signal transmission circuit of claim 2 , wherein the first resistance part and the second resistance part are polysilicon resistors.
4. The differential signal transmission circuit of claim 1 , wherein each of the first resistance part and the second resistance part has a configuration in which a resistor having a negative temperature characteristic for resistance values and a resistor having a positive temperature characteristic for the resistance values are connected in series.
5. The differential signal transmission circuit of claim 1 , wherein following conditions are satisfied:
RP·Cgd _ p≈RN·Cgd _ n
where RP is a resistance value of the first resistance part, RN is a resistance value of the second resistance part, Cgd_p is gate-drain capacitance of the high-side transistor, and Cgd_n is gate-drain capacitance of the low-side transistor.
6. A controller area network (CAN) transceiver comprising the differential signal transmission circuit of claim 1 .
7. A low voltage differential signaling (LVDS) system comprising the differential signal transmission circuit of claim 1 .