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US 5,515,005 AGranted
Operational amplifier
AssigneeMurata Manufacturing Co., Ltd.
InventorNaoto Yoshioka
Life of this patent
Estimating the term…
Abstract
An operational amplifier includes a pair of current mirror circuits and a buffer circuit commonly connected to outputs of the pair of current mirror circuits and a first current source. The first current source is electrically connected to the current mirror circuits so as to be controlled by operating currents of the current mirror circuits.
Claims26
A voltage feedback operational amplifier comprising:
- at least one pair of current mirror means;
- and
- a buffer circuit commonly connected to outputs of said at least one pair of current mirror means and having a first current source;
- a first capacitor and first and second resistors connected between an input and an output of said buffer circuit and connected in series with each other;
- and
- a second capacitor connected between a node of said first and second resistors and a power supply;
- wherein
- said first current source is electrically connected to one of said at least one pair of current mirror means so as to be controlled by only one operating current output from said one of said current mirror means.
5 more elements
A voltage feedback operational amplifier comprising:
- a pair of current mirror means;
- a buffer circuit commonly connected to outputs of said pair of current mirror means, the buffer circuit having a first current source for controlling a current flowing in the buffer circuit and a second current source for supplying a current to the buffer circuit independently of the first current source, wherein said first current source and said second current source are each controlled by only one operating current output from a respective one of said pair of current mirror means;
- a first capacitor and a first resistor connected between an input and an output of said buffer circuit and connected in series with each other;
- and
- a series circuit connected between at least one of said input and said output of said buffer circuit and a power supply and having a second resistor and a second capacitor connected in series with each other.
2 more elements
An operational amplifier comprising:
- at least one pair of current mirror means;
- a buffer circuit commonly connected to outputs of said at least one pair of current mirror means and having a first current source;
- a first capacitor and first and second resistors connected between an input and an output of said buffer circuit;
- said first resistor and said second resistor begin connected in series with each other through said first capacitor;
- a second capacitor connected between a node of said first resistor and said first capacitor and a power supply;
- and
- a third resistor and a third capacitor connected in series with each other between a node of said first capacitor and said second resistor and said power supply;
- wherein
- said first current source is electrically connected to one of said at least one pair of current mirror means so as to be controlled by only one operating current output from said one of said current mirror means.
6 more elements
An operational amplifier comprising:
- at least one pair of current mirror means;
- a buffer circuit commonly connected to outputs of said at least one pair of current mirror means and having a first current source;
- a first capacitor and a first resistor connected between an input and an output of said buffer circuit and connected in series with each other;
- a series circuit connected between a node of said first capacitor and said first resistor and a power supply and having a second resistor and a second capacitor;
- wherein
- said first current source is electrically connected to one of said at least one pair of current mirror means so as to be controlled by only one operating current output from said one of said current mirror means.
3 more elements
An operational amplifier comprising:
- a pair of differential amplification means each having positive and negative input terminals;
- a pair of current mirror means connected to said pair of differential amplification means so that outputs of the differential amplification means are applied thereto;
- a buffer circuit commonly connected to outputs of said pair of current mirror means;
- a first capacitor and first and second resistors connected between an input and an output of said buffer circuit and connected in series with each other;
- and
- a second capacitor connected between a node of said first resistor and said second resistor and a power supply.
3 more elements
An operational amplifier comprising:
- a pair of differential amplification means each having positive and negative input terminals;
- a pair of current mirror means electrically connected to said pair of differential amplification means so that outputs of the differential amplification means are applied thereto;
- a buffer circuit commonly connected to outputs of said pair of current mirror means;
- first and second resistors and a first capacitor connected between an input and an output of said buffer circuit,
- said first resistor being connected in series with the second resistor through the first capacitor;
- a second capacitor connected between a node of said first resistor and said first capacitor and a power supply;
- and
- a third resistor and a third capacitor connected between a node of said first capacitor and said second resistor and the power supply and connected in series with each other.
5 more elements
An operational amplifier comprising:
- a pair of differential amplification means each having positive and negative input terminals;
- a pair of current mirror means connected to said pair of differential amplification means so that outputs of the differential amplification means are applied thereto;
- a buffer circuit commonly connected to outputs of said pair of current mirror means;
- a first capacitor and a first resistor connected between an input and an output of said buffer circuit and connected in series with each other, and
- a series circuit connected between at least one of the input and the output of the buffer circuit and a power supply and having a second resistor and a second capacitor.
2 more elements
An operational amplifier comprising:
- a pair of differential amplification means each having positive and negative input terminals;
- a pair of current mirror means connected to said pair of differential amplification means so that outputs of the differential amplification means are applied thereto;
- a buffer circuit commonly connected to outputs of said pair of current mirror means;
- a first capacitor and a first resistor connected between an input and an output of said buffer circuit and connected in series with each other, and
- a series circuit connected between a node of the first capacitor and the first resistor and a power supply and having a second resistor and a second capacitor.
2 more elements
An operational amplifier comprising:
- a pair of current mirror means;
- a diamond-type buffer circuit commonly connected to outputs of said pair of current mirror means,
- said buffer circuit having in its input stage a transistor having an emitter terminal, a collector terminal and a base terminal;
- and
- a capacitor connected between the base terminal and the emitter terminal of said transistor.
2 more elements
Dependencies are inferred from the claim text.