POWER SUPPLY CIRCUIT AND SEMICONDUCTOR DEVICE
A power supply circuit comprises: a first voltage booster circuit that receives a first clock signal having a fixed frequency, and supplies a voltage to a prescribed circuit; and a second voltage booster circuit that receives a second clock signal having a frequency corresponding to an operating frequency of the prescribed circuit, and supplies a voltage to the prescribed circuit.
1 . A power supply circuit comprising:
a first voltage booster circuit that receives a first clock signal having a fixed frequency, and supplies a voltage to a prescribed circuit; and
a second voltage booster circuit that receives a second clock signal having a frequency corresponding to an operating frequency of said prescribed circuit, and supplies a voltage to said prescribed circuit.
2 . The power supply circuit according to claim 1 , further comprising a high voltage detection circuit that detects a voltage supplied to said prescribed circuit by said first voltage booster circuit and said second voltage booster circuit, and in a case where said voltage is larger than a prescribed threshold voltage, stops a voltage boosting operation in said first voltage booster circuit and said second voltage booster circuit.
3 . The power supply circuit according to claim 1 , further comprising an internal clock generation circuit that generates said first clock signal.
4 . The power supply circuit according to claim 2 , further comprising an internal clock generation circuit that generates said first clock signal.
5 . The power supply circuit according to claim 1 , wherein
said first voltage booster circuit outputs a direct current component in current consumed by said prescribed circuit, and
said second voltage booster circuit outputs an alternating current component in current consumed by said prescribed circuit.
6 . The power supply circuit according to claim 2 , wherein
said first voltage booster circuit outputs a direct current component in current consumed by said prescribed circuit, and
said second voltage booster circuit outputs an alternating current component in current consumed by said prescribed circuit.
7 . The power supply circuit according to claim 3 , wherein
said first voltage booster circuit outputs a direct current component in current consumed by said prescribed circuit, and
said second voltage booster circuit outputs an alternating current component in current consumed by said prescribed circuit.
8 . The power supply circuit according to claim 1 , further comprising: a frequency multiplier circuit that receives a clock signal having an operating frequency of said prescribed circuit, and multiplies said frequency, which is outputted as said second clock signal.
9 . The power supply circuit according to claim 2 , further comprising: a frequency multiplier circuit that receives a clock signal having an operating frequency of said prescribed circuit, and multiplies said frequency, which is outputted as said second clock signal.
10 . The power supply circuit according to claim 3 , further comprising: a frequency multiplier circuit that receives a clock signal having an operating frequency of said prescribed circuit, and multiplies said frequency, which is outputted as said second clock signal.
11 . The power supply circuit according to claim 4 , further comprising: a frequency multiplier circuit that receives a clock signal having an operating frequency of said prescribed circuit, and multiplies said frequency, which is outputted as said second clock signal.
12 . The power supply circuit according to claim 1 , further comprising: a frequency divider circuit that receives a clock signal having an operating frequency of said prescribed circuit, and performs frequency division of said frequency, which is outputted as said second clock signal.
13 . The power supply circuit according to claim 2 , further comprising: a frequency divider circuit that receives a clock signal having an operating frequency of said prescribed circuit, and performs frequency division of said frequency, which is outputted as said second clock signal.
14 . The power supply circuit according to claim 3 , further comprising: a frequency divider circuit that receives a clock signal having an operating frequency of said prescribed circuit, and performs frequency division of said frequency, which is outputted as said second clock signal.
15 . The power supply circuit according to claim 4 , further comprising: a frequency divider circuit that receives a clock signal having an operating frequency of said prescribed circuit, and performs frequency division of said frequency, which is outputted as said second clock signal.
16 . The power supply circuit according to claim 5 , further comprising: a frequency divider circuit that receives a clock signal having an operating frequency of said prescribed circuit, and performs frequency division of said frequency, which is outputted as said second clock signal.
17 . A semiconductor device comprising said power supply circuit according to claim 1 .
18 . The semiconductor device according to claim 17 , further comprising said prescribed circuit.