Circuit for generating substrate voltage and pumped-up voltage with a single oscillator

Claim 2

A constant voltage generator comprising: a substrate voltage pumping circuit, generating a substrate voltage; a voltage pumping circuit, generating a supply voltage; means for generating pulses to which said substrate voltage pumping circuit and said voltage pumping circuit are commonly responsive; a first detector detecting said substrate voltage of said substrate voltage pumping circuit and generating a substrate voltage control signal for controlling operation of said substrate voltage pumping circuit according to results of said detected substrate voltage; a second detector detecting said supply voltage of said voltage pumping circuit and generating a pumped-up voltage control signal for controlling operation of said voltage pumping circuit according to results of said detected supply voltage; and means for receiving said substrate voltage control signal and said pumped-up voltage control signal and generating a pulse control signal, said means for generating pulses being responsive to said pulse control signal.

Claim 3

A constant voltage generator comprising: a substrate voltage pumping circuit for generating a substrate voltage; a substrate voltage detecting circuit for detecting said substrate voltage output from said substrate voltage pumping circuit and generating a substrate voltage control signal; a voltage pumping circuit for generating a pumped-up voltage; a pumped-up voltage detecting circuit for detecting the pumped-up voltage output from said voltage pumping circuit and generating a pumped-up voltage control signal; an oscillator coupled commonly to said substrate voltage pumping circuit and said voltage pumping circuit, for generating pulses; a substrate voltage driving circuit for receiving the pulses output from said oscillator and generating a first driving signal supplied to said substrate voltage pumping circuit in response to said substrate voltage control signal; a voltage pumping driving circuit for receiving the pulses output from said oscillator and generating a second driving signal supplied to said voltage pumping circuit in response to said pumped-up voltage control signal; and means for receiving said substrate voltage control signal and said pumped-up voltage control signal and generating an oscillator control signal, said oscillator being responsive to said oscillator control signal; whereby said substrate voltage pumping circuit and said pumping voltage circuit operate independently of each other in response to the pulses output from said single oscillator.

Claim 4

A constant voltage generator comprising: a substrate voltage pumping circuit for generating a substrate voltage; a substrate voltage detecting circuit for detecting said substrate voltage output from said substrate voltage pumping circuit and generating a substrate voltage control signal; a voltage pumping circuit for generating a pumped-up voltage; a pumped-up voltage detecting circuit for detecting the pumped-up voltage output from said voltage pumping circuit and generating a pumped-up voltage control signal; an oscillator coupled commonly to said substrate voltage pumping circuit and said voltage pumping circuit, for generating pulses; a substrate voltage driving circuit for receiving the pulses output from said oscillator and generating a first driving signal supplied to said substrate voltage pumping circuit in response to said substrate voltage control signal; a voltage pumping driving circuit for receiving the pulses output from said oscillator and generating a second driving signal supplied to said voltage pumping circuit in response to said pumped-up voltage control signal; and means for receiving said substrate voltage control signal and said pumped-up voltage control signal and generating an oscillator control signal, said oscillator being responsive to said oscillator control signal; whereby said substrate voltage pumping circuit and said pumping voltage circuit operate independently of each other in response to the pulses output from said single oscillator.

Claim 5

A constant voltage generator as in claim 2, wherein said means for generating an oscillator control signal comprises a NOR gate receiving said substrate voltage control signal and said pumped-up voltage control signal to generate said oscillator control signal.

Claim 6

A constant voltage generator as in claim 2, wherein said substrate voltage driving circuit is disabled and independent from said voltage pumping circuit when said substrate voltage is at a first level; wherein said voltage pumping driving circuit is disabled and independent from said substrate voltage pumping circuit when said pumped-up voltage is at a second level.