US6586995B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplifier
Assignee: Mitsubishi Electric Corp
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Filing: 2002-09-19
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Granted: 2003-07-01
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Expires: 2022-09-19
Abstract
Abstract An amplifier includes a first voltage follower including P-type MOS transistors and a second voltage follower including N-type MOS transistors. The first voltage follower amplifies without being saturated even if an input signal voltage approaches a level of a power supply voltage when the input signal voltage is at least equal to a bias voltage, but does not amplify when the input voltage is less than the bias voltage. A second voltage follower of the amplifier amplifies without being saturated even if an input signal voltage approaches a ground potential when the input signal voltage is less than the bias voltage, but does not amplify when the input voltage is at least equal to the bias voltage.
Inventors
- 👤 Masanori Tachibana
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:01
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/68; H03F3/45; H03F3/45071; H03F3/45076; H03F3/45179; H03F3/45183
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
200 words
An amplifier comprising: a first voltage follower circuit that includes a plurality of P-type MOS transistors and outputs a current having a magnitude equivalent to a value obtained by dividing a difference voltage between an input bias voltage, applied to a positive-phase input terminal of the first voltage follower circuit, and an input signal voltage, applied to a negative-phase input terminal of the first voltage follower circuit, supplied directly with feedback from an output terminal via a first resistor, by resistance of the first resistor; a first current mirror circuit that receives the current output by the first voltage follower circuit; a second voltage follower circuit that includes a plurality of N-type MOS transistors and outputs a current having a magnitude equivalent to a value obtained by dividing a difference voltage between an input bias voltage applied to a positive-phase input terminal of the second voltage follower circuit, and the input signal voltage, applied to a negative-phase input terminal of the second voltage follower circuit, supplied directly with feedback from an output terminal, via a second resistor, by resistance of the second resistor; and a second current mirror circuit that receives the current output by the second voltage follower circuit.
Claim 2
Dependent Claim
200 words
An amplifier comprising: a first voltage follower circuit that includes a plurality of P-type MOS transistors and outputs a current having a magnitude equivalent to a value obtained by dividing a difference voltage between an input bias voltage, applied to a positive-phase input terminal of the first voltage follower circuit, and an input signal voltage, applied to a negative-phase input terminal of the first voltage follower circuit, supplied directly with feedback from an output terminal via a first resistor, by resistance of the first resistor; a first current mirror circuit that receives the current output by the first voltage follower circuit; a second voltage follower circuit that includes a plurality of N-type MOS transistors and outputs a current having a magnitude equivalent to a value obtained by dividing a difference voltage between an input bias voltage applied to a positive-phase input terminal of the second voltage follower circuit, and the input signal voltage, applied to a negative-phase input terminal of the second voltage follower circuit, supplied directly with feedback from an output terminal, via a second resistor, by resistance of the second resistor; and a second current mirror circuit that receives the current output by the second voltage follower circuit.
Claim 3
Dependent Claim
46 words
The amplifier according to claim 1 , further comprising a series circuit connected between ground and an output line common to the first current mirror circuit and the second current mirror circuit, wherein the series circuit includes a load resistor and an output bias voltage source.
Claim 4
Dependent Claim
33 words
The amplifier according to claim 2 , wherein gain of the amplifier is determined only by a ratio of the resistances of the first and second resistors and resistance of the load resistor.
Claim 5
Dependent Claim
112 words
An amplifier comprising: a voltage follower circuit that includes P-type MOS transistors and outputs a current having a magnitude equivalent to a value obtained by dividing a difference voltage between an input bias voltage, applied to a positive-phase input terminal, and an input signal voltage applied to a negative-phase input terminal, supplied directly with a feedback from an output terminal, via a resistor, by resistance of the resistor; a current mirror circuit that receives the current output by the voltage follower circuit; and a series circuit connected between ground and an output line of the current mirror circuit, wherein the series circuit includes a load resistor and an output bias voltage source.
Claim 6
Dependent Claim
112 words
An amplifier comprising: a voltage follower circuit that includes P-type MOS transistors and outputs a current having a magnitude equivalent to a value obtained by dividing a difference voltage between an input bias voltage, applied to a positive-phase input terminal, and an input signal voltage applied to a negative-phase input terminal, supplied directly with a feedback from an output terminal, via a resistor, by resistance of the resistor; a current mirror circuit that receives the current output by the voltage follower circuit; and a series circuit connected between ground and an output line of the current mirror circuit, wherein the series circuit includes a load resistor and an output bias voltage source.
Claim 7
Dependent Claim
30 words
The amplifier according to claim 4 , wherein gain of the amplifier is determined only by a ratio of the resistance of the resistor and resistance of the load resistor.
Claim 8
Dependent Claim
111 words
An amplifier comprising: a voltage follower circuit that includes N-type MOS transistors and outputs a current having a magnitude equivalent to a value obtained by dividing a difference voltage between an input bias voltage, applied to a positive-phase input terminal, and an input signal voltage applied to a negative-phase input terminal, supplied directly with feedback from an output terminal, via a resistor, by resistance of the resistor; a current mirror circuit that receives the current output by the voltage follower circuit; and a series circuit connected between ground and an output line of the current mirror circuit, wherein the series circuit includes a load resistor and an output bias voltage source.
Claim 9
Dependent Claim
111 words
An amplifier comprising: a voltage follower circuit that includes N-type MOS transistors and outputs a current having a magnitude equivalent to a value obtained by dividing a difference voltage between an input bias voltage, applied to a positive-phase input terminal, and an input signal voltage applied to a negative-phase input terminal, supplied directly with feedback from an output terminal, via a resistor, by resistance of the resistor; a current mirror circuit that receives the current output by the voltage follower circuit; and a series circuit connected between ground and an output line of the current mirror circuit, wherein the series circuit includes a load resistor and an output bias voltage source.
Claim 10
Dependent Claim
30 words
The amplifier according to claim 6 , wherein gain of the amplifier is determined only by a ratio of the resistance of the resistor and resistance of the load resistor.
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