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US 5,296,754 AGranted
Push-pull circuit resistant to power supply and temperature induced distortion
AssigneeKabushiki Kaisha Toshiba
InventorYoshiro Yoshinaga
Life of this patent
Estimating the term…
Abstract
A push-pull output stage circuit includes two series-connected transistors, receives an input signal and outputs a signal corresponding to the input signal. A control circuit detects a current flowing in the transistors and controls the push-pull circuit to keep an ineffective current flowing in the push-pull circuit at substantially a constant value.
Claims7
A push-pull circuit comprising:
- an output stage circuit connected between a first potential and a second potential and having a first transistor of a first conductivity type and a second transistor of a second conductivity type whose current paths are serially connected;
- a level shift circuit having a third transistor of the first conductivity type and a fourth transistor of the second conductivity type whose current path is connected in parallel with the current path of said third transistor of the first conductivity type;
- a control circuit having a fifth transistor of the first conductivity type and a first current source circuit which are serially connected between said first and second potentials, and a second current source circuit and a sixth transistor of the second conductivity type which are serially connected between said first and second potentials;
- wherein a control terminal of said fifth transistor of the first conductivity type is connected to a control terminal of said first transistor of the first conductivity type and one of output terminals of said level shift circuit;
- a control terminal of said sixth transistor of the second conductivity type is connected to a control terminal of said second transistor of the second conductivity type and the other output terminal of said level shift circuit;
- a connection node between said fifth transistor of the first conductivity type and said first current source circuit is connected to a control terminal of said third transistor of the first conductivity type;
- and
- a connection node between said second current source circuit and said sixth transistor of the second conductivity type is connected to a control terminal of said fourth transistor of the second conductivity type.
5 more elements
A push-pull circuit comprising:
- an output stage circuit having first and second transistors whose current path are serially connected between a first potential and a second potential;
- means responsive to gate/source voltage signals from said first and second transistors for generating control voltage signals dependent on the current flowing in said first and second transistor;
- means for setting a potential difference between signals supplied to control terminals of said first and second transistors according to the control voltage signals supplied from said generating means;
- said potential difference setting means including level shift means, connected to control terminals of said first and second transistors, for setting a variable potential difference between signals supplied to the control terminals of said first and second transistors;
- wherein the current level of at least one of the currents flowing in said first and second transistors is detected and the control signal is supplied to said level shift means to set the ineffective currents flowing in said first and second transistors to a constant value according to the detected current level;
- said level shift means constituted by a current source, a level shift circuit and an output controlling transistor which are serially connected between said first and second potentials;
- a signal on a connection node between said current source and said level shift circuit being supplied to a control terminal of said first transistor, and a signal on a connection node between said level shift circuit and said output controlling transistor being supplied to a control terminal of said second transistor;
- and
- said control signal generation means controlling the level shift amount of said level shift circuit by the control signal.
6 more elements
A push-pull circuit comprising:
- an output stage circuit having first and second transistors whose current paths are serially connected between a first potential and a second potential;
- means responsive to gate/source voltage signals from said first and second transistors for generating control voltage signals dependent on the current flowing in said first and second transistor;
- means for setting a potential difference between signals supplied to control terminals of said first and second transistors according to the control voltage signals supplied from said generating means;
- said potential difference setting means including a level shift circuit having a third transistor and a fourth transistor whose current path is connected in parallel with the current path of said third transistor;
- and
- said generating means including:
- a control circuit having a fifth transistor and a first current source circuit which are serially connected between said first and second potentials;
- and
- a second current source circuit and a sixth transistor which are serially connected between said first and second potentials;
- a control terminal of said fifth transistor connected to a control terminal of said first transistor and an output terminal of said level shift circuit;
- a control terminal of said sixth transistor is connected to a control terminal of said second transistor and another output terminal of said level shift circuit;
- a connection node between said fifth transistor and first current source circuit connected to the control terminal of said third transistor;
- and
- a connection node between said second current source circuit and sixth transistor connected to the control terminal of said fourth transistor.
11 more elements
Dependencies are inferred from the claim text.