A phase shift control circuit for a multi-channel system, comprising:
- a pulse control circuit including:
- a first voltage divider circuit connected to an input voltage source;
- a plurality of transistors including a first transistor, a second transistor and a plurality of third transistors, wherein an input terminal of each of the transistors is connected to a common voltage source, and an output terminal of the first transistor is grounded through a first feedback resistor;
- a front operational amplifier having two input terminals connected to the first voltage divider circuit and the output terminal of the first transistor respectively, and an output terminal connected to a control terminal of each of the transistors;
- a plurality of comparators, wherein one input terminal of each of the comparators is connected to an output terminal of one of the third transistors, another input terminal of one of the comparators is connected to the output terminal of the first transistor, and another input terminal of each of the other comparators is connected to one of a plurality of reference voltage sources;
- a plurality of clock switch circuits connected to output terminals of the plurality of third transistors respectively;
- and
- a plurality of pulse generating circuits, wherein input terminals of which are connected to output terminals of the plurality of comparators respectively, and each of the pulse generating circuits is configured to output a pulse signal for turning on or off the one or more clock switch circuits;
- a current mirror circuit including:
- a first current mirror including a fourth transistor and a fifth transistor, wherein a control terminal of the fourth transistor is connected to a control terminal of the fifth transistor, an input terminal and a control terminal of the fourth transistor are connected to an output terminal of the second transistor, and an output terminal of the fourth transistor and an output terminal of the fifth transistor are grounded;
- and
- a second current mirror including a sixth transistor and a seventh transistor, wherein an output terminal and a control terminal of the sixth transistor are connected to an input terminal of the fifth transistor, the control terminal of the sixth transistor is connected to a control terminal of the seventh transistor, and an input terminal of the sixth transistor and an input terminal of the seventh transistor are connected to the common voltage source;
- and
- a plurality of current matching circuits each including:
- a second voltage divider circuit connected to a voltage signal source;
- a plurality of matching transistors including a first matching transistor, a second matching transistor and a third matching transistor, an input terminal of each of the matching transistors is connected to the common voltage source, an output terminal of the first matching transistor is grounded through a second feedback resistor and an output terminal of the second matching transistor is grounded through a third feedback resistor, the output terminal of the second matching transistor is connected to an output terminal of the seventh transistor, an output terminal of the third matching transistor is connected to the input terminal of the fifth transistor;
- a matching operational amplifier having one input terminal connected to the output terminal of the first matching transistor, and an output terminal connected to control terminals of the plurality of matching transistors;
- and
- a phase shift circuit connected between the second voltage divider circuit and another input terminal of the matching operational amplifier.