US5264808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substrate potential adjusting apparatus
Assignee: Toshiba Corp
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Filing: 1992-02-26
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Granted: 1993-11-23
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Expires: 2012-02-26
Abstract
Abstract A substrate potential adjusting apparatus of the invention includes: a pump circuit for drawing a current from a semiconductor substrate to adjust a substrate potential; ring oscillators for supplying a periodical signal to the pump circuit and causing the pump circuit to operate; a limiter circuit for detecting a potential of the semiconductor substrate and controlling to switch between operation and non-operation of the ring oscillators in accordance with the detected potential; and a selector circuit for changing the oscillation period of the periodical signal outputted from the ring oscillators in accordance with a signal inputted externally from a chip, the signal determining an operation mode of a circuit formed on the semiconductor substrate.
Inventors
- 👤 Hiroaki Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:32
CPC Classifications
G; G11; G11C; G11C5/00; G11C5/14; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/20; G05F3/205; H; H03; H03K; H03K3/00; H03K3/02; H03K3/027; H03K3/03; H03K3/0315
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
167 words
A substrate potential adjusting apparatus comprising: pump means for drawing a current from a semiconductor substrate to adjust a substrate potential; oscillator means for supplying a periodic signal to said pump means and causing said pump means to operate; control means for detecting a potential of said semiconductor substrate and for controlling switching of said oscillator means between operation and non-operation in accordance with said detected potential; selection means for changing the oscillation period of said periodic signal output from said oscillator means in accordance with a signal input externally from a chip, said signal determining an operation mode of a circuit formed on said semiconductor substrate; wherein said oscillator means includes capacitors, and said selection means switches between a connected state where said capacitors are electrically connected to said oscillator means and a disconnected state where said capacitors are electrically disconnected from said oscillator means in response to said signal externally input from said chip so as to vary the oscillation period of said oscillator means.
Claim 2
Dependent Claim
167 words
A substrate potential adjusting apparatus comprising: pump means for drawing a current from a semiconductor substrate to adjust a substrate potential; oscillator means for supplying a periodic signal to said pump means and causing said pump means to operate; control means for detecting a potential of said semiconductor substrate and for controlling switching of said oscillator means between operation and non-operation in accordance with said detected potential; selection means for changing the oscillation period of said periodic signal output from said oscillator means in accordance with a signal input externally from a chip, said signal determining an operation mode of a circuit formed on said semiconductor substrate; wherein said oscillator means includes capacitors, and said selection means switches between a connected state where said capacitors are electrically connected to said oscillator means and a disconnected state where said capacitors are electrically disconnected from said oscillator means in response to said signal externally input from said chip so as to vary the oscillation period of said oscillator means.
Claim 3
Dependent Claim
54 words
An apparatus according to claim 1, wherein said externally input signal is a signal for switching between a normal state and a self-refresh state, and said selection means receives said externally input signal and controls said oscillator means so as to make said oscillation period longer for said self-refresh state than said normal state.
Claim 4
Dependent Claim
58 words
An apparatus according to claim 1, wherein said externally input signal is a signal for switching between a chip active state and a chip standby state, and said selection means receives said externally input signal and controls said oscillator means so as to make said oscillation period longer for said chip standby state than said chip active state.
Claim 5
Dependent Claim
14 words
An apparatus according to claim 1, wherein said oscillator means is a ring oscillator.
Claim 6
Dependent Claim
14 words
An apparatus according to claim 2, wherein said oscillator means is a ring oscillator.
Claim 7
Dependent Claim
14 words
An apparatus according to claim 3, wherein said oscillator means is a ring oscillator.
Claim 8
Dependent Claim
18 words
An apparatus according to claim 2, wherein the apparatus is adapted to enter said normal state upon power-on.
Claim 9
Dependent Claim
204 words
A substrate potential adjusting apparatus comprising: pump means for drawing a current from a semiconductor substrate to adjust a substrate potential; oscillator means for supplying a periodic signal to said pump means and causing said pump means to operate; control means for detecting a potential of said semiconductor substrate and for controlling switching of said oscillator means between operation and non-operation in accordance with said detected potential; selection means for changing the oscillation period of said periodic signal output from said oscillator means in accordance with a signal input externally from a chip, said signal determining an operation mode of a circuit formed on said semiconductor substrate; said externally input signal being a signal for switching between a normal state and a self-refresh state, and said selection means receiving said externally input signal and controlling said oscillator means, so as to make said oscillation period longer for said self-refresh state than said normal state, wherein said oscillator means comprises a plurality of oscillator circuits each outputting a said periodic signal having a different period, and said selection means selectively causes one of said plurality of oscillator circuits to operate to supply a said periodic signal from said selected oscillator circuit to said pump means.
Claim 10
Dependent Claim
204 words
A substrate potential adjusting apparatus comprising: pump means for drawing a current from a semiconductor substrate to adjust a substrate potential; oscillator means for supplying a periodic signal to said pump means and causing said pump means to operate; control means for detecting a potential of said semiconductor substrate and for controlling switching of said oscillator means between operation and non-operation in accordance with said detected potential; selection means for changing the oscillation period of said periodic signal output from said oscillator means in accordance with a signal input externally from a chip, said signal determining an operation mode of a circuit formed on said semiconductor substrate; said externally input signal being a signal for switching between a normal state and a self-refresh state, and said selection means receiving said externally input signal and controlling said oscillator means, so as to make said oscillation period longer for said self-refresh state than said normal state, wherein said oscillator means comprises a plurality of oscillator circuits each outputting a said periodic signal having a different period, and said selection means selectively causes one of said plurality of oscillator circuits to operate to supply a said periodic signal from said selected oscillator circuit to said pump means.
Claim 11
Dependent Claim
60 words
An apparatus to claim 8, wherein said selection means receives said externally input signal and selects one of said oscillator circuits in said self-refresh state and selects another of said oscillator circuits in said normal state, and said one of said oscillator circuits outputs said periodic signal longer than said periodic signal output by said another of said oscillator circuits.
Claim 12
Dependent Claim
14 words
An apparatus according to claim 9, wherein said oscillator means is a ring oscillator.
Claim 13
Dependent Claim
14 words
An apparatus according to claim 8, wherein said oscillator means is a ring oscillator.
Claim 14
Dependent Claim
209 words
A substrate potential adjusting apparatus comprising: pump means for drawing a current from a semiconductor substrate to adjust a substrate potential; oscillator means for supplying a periodic signal to said pump means and causing said pump means to operate; control means for detecting a potential of said semiconductor substrate and for controlling switching of said oscillator means between operation and non-operation in accordance with said detected potential; and selection means for changing the oscillation period of said periodic signal output from said oscillator means in accordance with a signal input externally from a chip, said signal determining an operation mode of a circuit formed on said semiconductor substrate; said externally input signal being a signal for switching between a chip active state and a chip standby state, and said selection means receiving said externally input signal and controlling said oscillator means, so as to make said oscillation period longer for said chip standby state than said chip active state. wherein said oscillator means comprises a plurality of oscillator circuits each outputting a said periodic signal having a different period, and said selection means selectively causes one of said plurality of oscillator circuits to operate to supply a said periodic signal from said selected oscillator circuit to said pump means.
Claim 15
Dependent Claim
209 words
A substrate potential adjusting apparatus comprising: pump means for drawing a current from a semiconductor substrate to adjust a substrate potential; oscillator means for supplying a periodic signal to said pump means and causing said pump means to operate; control means for detecting a potential of said semiconductor substrate and for controlling switching of said oscillator means between operation and non-operation in accordance with said detected potential; and selection means for changing the oscillation period of said periodic signal output from said oscillator means in accordance with a signal input externally from a chip, said signal determining an operation mode of a circuit formed on said semiconductor substrate; said externally input signal being a signal for switching between a chip active state and a chip standby state, and said selection means receiving said externally input signal and controlling said oscillator means, so as to make said oscillation period longer for said chip standby state than said chip active state. wherein said oscillator means comprises a plurality of oscillator circuits each outputting a said periodic signal having a different period, and said selection means selectively causes one of said plurality of oscillator circuits to operate to supply a said periodic signal from said selected oscillator circuit to said pump means.
Claim 16
Dependent Claim
62 words
An apparatus according to claim 12, wherein said selection means receives said externally input signal, and selects one of said oscillator circuits in said chip standby state and selects another of said oscillator circuits in said chip active state, said one of said oscillator circuits outputting said periodic signal longer than said periodic signal outputted by said another of said oscillator circuits.
Claim 17
Dependent Claim
14 words
An apparatus according to claim 12, wherein said oscillator means is a ring oscillator.
Claim 18
Dependent Claim
14 words
An apparatus according to claim 13, wherein said oscillator means is a ring oscillator.
References Cited (Backward Citations)
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