초록 ▼

A circuit includes a band-gap reference circuit and a start-up circuit coupled between an output and an input of the band-gap reference circuit. When the output of the band-gap reference circuit is below a start-up voltage threshold, the start-up circuit provides a first voltage at the input of the

A circuit includes a band-gap reference circuit and a start-up circuit coupled between an output and an input of the band-gap reference circuit. When the output of the band-gap reference circuit is below a start-up voltage threshold, the start-up circuit provides a first voltage at the input of the band-gap reference circuit which, in turn, causes the band-gap reference circuit to produce a desired voltage at the output. When the desired voltage has been reached, i.e., a voltage corresponding to the start-up voltage threshold, the start-up circuit turns off and does not interfere with the normal operation of the band-gap reference circuit. The start-up circuit may include first circuitry configured to produce a first voltage if a voltage signal at the output of the band-gap reference circuit is below the start-up voltage threshold. The start-up circuit may further include second circuitry coupled to the first circuitry and configured to produce a second voltage at the input of the band-gap reference circuit in response to the first voltage. The start-up voltage threshold may be a desirable output voltage, for example approximately 1.25 volts.

대표청구항 ▼

[ What is claimed is:] [1.] A circuit comprising:a band-gap reference circuit; anda start-up circuit coupled between an output of said band-gap reference circuit and an input of said band-gap reference circuit, said start-up circuit having:first circuitry configured to produce a first voltage when a

[ What is claimed is:] [1.] A circuit comprising:a band-gap reference circuit; anda start-up circuit coupled between an output of said band-gap reference circuit and an input of said band-gap reference circuit, said start-up circuit having:first circuitry configured to produce a first voltage when a voltage signal at said output of said band-gap reference circuit is below a start-up voltage threshold; andsecond circuitry coupled to said first circuitry and configured to produce a second voltage at said input of said band-gap reference circuit in response to said first voltage.