1. A reference voltage generating circuit comprising:
a first circuit having a pair of first MOS transistors of an N-channel type connected together to form a current mirror circuit, a drain of the output-side first MOS transistor serving as a current output end, a source of the output-side first MOS transistor being connected through a resistor to a plurality of parallel-connected diodes, a drain and a gate of the input-side first MOS transistor serving as a current input end;
first, second, and third terminals;
a second MOS transistor of a P-channel type having a drain thereof connected to the current output end and having a source thereof connected to the first terminal;
a third MOS transistor of a P-channel type having a drain thereof connected to the current input end and having a source thereof connected to the second terminal;
an operational amplifier having a first input terminal thereof connected to the current output end, having a second input terminal thereof connected to the current input end, and having an output terminal thereof connected to gates of the second and third MOS transistors, the operational amplifier operating so as to keep a voltage at the current output end equal to a voltage at the current input end;
a fourth MOS transistor of a P-channel type having a source thereof connected to the third terminal and having a gate thereof connected to the gates of the second and third MOS transistors;
a voltage extraction circuit connected to a drain of the fourth MOS transistor;
a reference voltage extraction terminal connected to a node between the fourth MOS transistor and the voltage extraction circuit; and
a current mirror circuit composed of fifth, sixth, and seventh MOS transistors of a P-channel type having sources thereof connected to a supply voltage line,
wherein the first terminal is connected to a drain and a gate of the fifth MOS transistor and to gates of the sixth and seventh MOS transistors, the second terminal is connected to a drain of the sixth MOS transistor, and the third terminal is connected to a drain of the seventh MOS transistor.
2. A reference voltage generating circuit as claimed in claim 1, further comprising:
a starting circuit for feeding a starting current to the current input end and to the gate of the second MOS transistor.
3. A semiconductor integrated circuit comprising:
a first circuit comprising an input-side N-channel MOS transistor and an output-side N-channel MOS transistor, each MOS transistor having a gate, wherein the gates are effectively connected such that a current mirror circuit is formed, a diode connected between a source of the input-side transistor and ground, and a plurality of diodes connected in parallel between a source of the output-side transistor and ground through a resistor;
a current output node to which a drain of the output-side transistor is connected;
a current input node to which a drain of the input-side transistor is connected;
a first terminal;
a P-channel MOS transistor having a drain thereof connected to the current output node and having a source thereof connected to the first terminal; and
an operational amplifier comprising a first input terminal thereof connected to the current output node, a second input terminal thereof connected to the current input node, and an output terminal thereof connected to a gate of the P-channel transistor, wherein the operational amplifier operates so as to keep a voltage at the current output node equal to a voltage at the current input node;
wherein the gates of the input-side transistor and the output-side transistor are connected to the current input node so as to maintain a ratio between a current flowing at the current input node and a current flowing at the current output node, and
the voltage at the current input node is set and maintained such that a drain-to-source voltage of the output-side transistor is sufficiently low to prevent hot carriers even if a voltage at the first terminal rises.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A road finishing machine comprising:
a controllable longitudinal conveyor device and a controllable transverse conveyor device each for conveying mixed laying material, the transverse conveyor device being disposed behind the longitudinal conveyor device in the moving direction of the road finishing machine, and
a control unit for adjusting a delivery rate of at least one of the longitudinal conveyor device or the transverse conveyor device, the control unit being connected to a sensory mechanism for determining at least one of a mixed laying material quantity or a mixed laying material rate, the delivery rate being adjustable in response to a signal received from the sensory mechanism representing at least one of the mixed laying material quantity or the mixed laying material rate, wherein the control unit is pilot controllable in response to laying parameters using a pilot control unit, and wherein the laying parameters comprise user inputs and the control unit can be overridden by the pilot control unit to increase the dependency of the delivery rate on the laying parameters compared to the sensory mechanism.
2. Road finishing machine according to claim 1, wherein at least one of the control unit or the pilot control unit is trainable based on the laying parameters.
3. Road finishing machine according to claim 1, wherein the laying parameters comprise at least one member selected from the group consisting of the width of spread, the thickness of spread, the laying speed, the steering position, the position of an extendable screed, the material stock, the travel drive speed, the driving speed of the road finishing machine, and the lateral inclination of the screed.
4. Road finishing machine according to claim 1 wherein a theoretically required delivery rate of at least one of the longitudinal conveyor device or the transverse conveyor device is computable and the control unit is pilot controllable in response to the computed delivery rate.
5. Road finishing machine according to claim 1 wherein the ratio of the delivery rates of the longitudinal conveyor device and the transverse conveyor device is variably adjustable with respect to each other.
6. Road finishing machine according to claim 1, further-comprising speed-controlled drive units that can adjust the delivery rate of at least one of the longitudinal conveyor device or the transverse conveyor device.
7. Road finishing machine according to claim 1 wherein the sensory mechanism comprises at least one level sensor.
8. Road finishing machine according to claim 1 wherein the road finishing machine comprises a wheeled finisher or a track-laying drive finisher.
9. Method of operating a road finishing machine having a controllable longitudinal conveyor device and a controllable transverse conveyor device each for conveying mixed laying material, the transverse conveyor device being disposed behind the longitudinal conveyor device in the direction of motion, and having a control unit for adjusting a delivery rate of at least one of the longitudinal conveyor device or the transverse conveyor device, wherein the control unit is connected to a sensory mechanism, the method comprising
determining at least one of a mixed laying material quantity or a mixed laying material rate,
adjusting the delivery rate in response to a signal of the sensory mechanism representing at least one of the mixed laying material quantity or the mixed laying material rate,
using a pilot control unit to pilot control the control unit in response to laying parameters, wherein user inputs are considered as laying parameters and the control unit can be overridden by the pilot control unit.
10. Method according to claim 9 which comprises training at least one of the control unit or the pilot control unit based on the laying parameters.
11. Method according to claim 9 which comprises selecting at least one laying parameters from the group consisting of width of spread, thickness of spread, laying speed, steering position, position of an extendable screed, material stock, travel drive speed, driving speed of the road finishing machine and the angle of inclination of the road finishing machine.
12. Method according to claim 9 which comprises calculating a theoretically required delivery rate of at least one of the longitudinal conveyor device or the transverse conveyor device from the laying parameters and adjusting the control unit with the pilot control corresponding to this delivery rate.