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US 10,541,677 B2Granted
Low output impedance, high speed and high voltage generator for use in driving a capacitive load
AssigneeSTMicroelectronics S.r.l.
InventorPavan Nallamothu
Life of this patent
Estimating the term…
Abstract
A voltage generator circuit uses a feedback loop to regulate an output voltage at an output node. A pair of opposite conductivity source-follower transistors are coupled to the output node. A first one of the source-follower transistors operates to provide a fast current transient for charging a capacitive load that is switchably connected to the output node. A second one of the source-follower transistor operate under feedback control to regulate the voltage level at the output node.
Claims32
A voltage generator circuit, comprising:
- a first current source transistor configured to generate a variable current;
- an output circuit having an input circuit leg configured to receive the variable current and an output circuit leg configured to generate an output voltage;
- wherein the input circuit leg comprises:
- a first diode-connected transistor of a first conductivity type;
- and
- a second diode-connected transistor of a second conductivity type coupled in series with the first diode-connected transistor;
- wherein the output circuit leg comprises:
- a first source-follower transistor of the first conductivity type having a gate terminal connected to a gate terminal of the first diode-connected transistor;
- a second source-follower transistor of the second conductivity type coupled in series with the first source-follower transistor and having a gate terminal connected to a gate terminal of the second diode-connected transistor;
- and
- an output node for the output voltage at connected source terminals of the first and second source-follower transistors;
- and
- a differential amplifier having a first input configured to receive a reference voltage and a second input configured to receive a feedback voltage derived from the output voltage, wherein an output of the differential amplifier is connected to a gate terminal of the first current source transistor.
10 more elements
A voltage generating circuit, comprising:
- an input circuit leg and an output circuit leg, wherein:
- the input circuit leg comprises:
- a first diode-connected transistor of a first conductivity type;
- and
- a second diode-connected transistor of a second conductivity type coupled in series with the first diode-connected transistor;
- the output circuit leg comprises:
- a first source-follower transistor of the first conductivity type having a gate terminal connected to a gate terminal of the first diode-connected transistor;
- a second source-follower transistor of the second conductivity type coupled in series with the first source-follower transistor and having a gate terminal connected to a gate terminal of the second diode-connected transistor;
- and
- an output node at connected source terminals of the first and second source-follower transistors;
- and
- a first current source configured to generate a variable current applied to the input circuit leg;
- wherein the variable current is generated in response to a difference between an output voltage generated at the output node and a reference voltage.
10 more elements
A voltage generator circuit, comprising:
- a first current source transistor configured to generate a variable current;
- an output circuit having an input circuit leg configured to receive the variable current and an output circuit leg configured to generate an output voltage;
- wherein the input circuit leg comprises:
- a first diode-connected transistor of a first conductivity type;
- and
- a second diode-connected transistor of a second conductivity type coupled in series with the first diode-connected transistor;
- wherein the output circuit leg comprises:
- a first source-follower transistor of the first conductivity type having a gate terminal connected to a gate terminal of the first diode-connected transistor;
- a second source-follower transistor of the second conductivity type coupled in series with the first source-follower transistor and having a gate terminal connected to a gate terminal of the second diode-connected transistor;
- and
- an output node for the output voltage at connected source terminals of the first and second source-follower transistors;
- a capacitive load;
- and
- a switching circuit configured to selectively connect the output voltage to the capacitive load.
11 more elements
A voltage generating circuit including an input circuit leg and an output circuit leg, wherein:
- the input circuit leg comprises:
- a first diode-connected transistor of a first conductivity type;
- and
- a second diode-connected transistor of a second conductivity type coupled in series with the first diode-connected transistor;
- the output circuit leg comprises:
- a first source-follower transistor of the first conductivity type having a gate terminal connected to a gate terminal of the first diode-connected transistor;
- a second source-follower transistor of the second conductivity type coupled in series with the first source-follower transistor and having a gate terminal connected to a gate terminal of the second diode-connected transistor;
- and
- an output node at connected source terminals of the first and second source-follower transistors;
- a capacitive load;
- and
- a switching circuit configured to selectively connect the output voltage to the capacitive load.
9 more elements
Dependencies are inferred from the claim text.