Voltage source circuit

The invention relates to a circuit, in particular to a voltage source circuit. The voltage source circuit comprises a plurality of N-channel depletion-type transistors M1, M2, M3 ... Mn, wherein the N-channel depletion-type transistors M1, M2, M3 ... Mn are sequentially in cascaded connection from bottom to top; a grid of the N-channel depletion-type transistor M1 is grounded; a source of the N-channel depletion-type transistor M1 is an output end and is simultaneously connected with the grid of the N-channel depletion-type transistor M2; a drain of the N-channel depletion-type transistor M1 is connected with the source of the N-channel depletion-type transistor M2 and is simultaneously connected with the grid of the N-channel depletion-type transistor M3; the source of the N-channel depletion-type transistor M2 is connected with the grid of the N-channel depletion-type transistor M3; the drain of the N-channel depletion-type transistor M2 is connected with the source of the N-channel depletion-type transistor M3, and so on; the grid of the N-channel depletion-type transistor M(n-1) is connected with the source of the N-channel depletion-type transistor M(n-2); the source of the N-channel depletion-type transistor M(n-1) is connected with the drain of the N-channel depletion-type transistor M(n-2); the drain of the N-channel depletion-type transistor M(n-1) is connected with the source of the N-channel depletion-type transistor Mn; the grid of the N-channel depletion-type transistor Mn is connected with the source of the N-channel depletion-type transistor M(n-1) and is simultaneously connected with the drain of the N-channel depletion-type transistor M(n-2); and the drain of the N-channel depletion-type transistor Mn is connected with a power supply. According to the voltage source circuit, the application voltage range of the circuit is expanded; and the voltage source circuit is simple in structure and easy to use.