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US 11,502,655 B2Granted
Logarithmic amplifier circuit
AssigneeTexas Instruments Incorporated
InventorsMartijn Fridus Snoeij, Marco Corsi
Life of this patent
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Abstract
A logarithmic amplifier circuit includes an adaptive gain amplifier circuit and a transistor. The adaptive gain amplifier circuit includes a gain stage and a diode. The gain stage includes an input terminal, and an output terminal. The diode includes a cathode terminal coupled to the output terminal, and an anode terminal coupled to a common terminal. The transistor includes a first terminal coupled to the input terminal, a second terminal coupled to the common terminal, and a third terminal coupled to the output terminal.
Claims20
A logarithmic amplifier circuit, comprising:
- an adaptive gain amplifier circuit comprising:
- a gain stage comprising:
- an input terminal;
- and
- an output terminal;
- and
- a diode comprising:
- a cathode terminal coupled to the output terminal;
- and
- an anode terminal coupled to a common terminal;
- and
- a transistor comprising:
- a first terminal coupled to the input terminal;
- a second terminal coupled to the common terminal;
- and
- a third terminal coupled to the output terminal.
13 more elements
A logarithmic amplifier circuit, comprising:
- a current input terminal;
- an adaptive gain amplifier circuit configured to provide a gain that decreases as an input current received at the current input terminal increases, and comprising:
- an inverting input terminal;
- and
- an output terminal;
- and
- a transistor comprising:
- a first terminal coupled to the output terminal of the adaptive gain amplifier circuit;
- a second terminal coupled to the inverting input terminal of the adaptive gain amplifier circuit;
- and
- a third terminal coupled to a common terminal;
- wherein the adaptive gain amplifier circuit further comprises:
- a diode coupled to the output terminal of the adaptive gain amplifier circuit and the third terminal of the transistor, and configured to vary the gain of the adaptive gain amplifier circuit based on the input current.
10 more elements
A logarithmic amplifier circuit, comprising:
- a current input terminal;
- an adaptive gain amplifier circuit configured to provide a gain that decreases as an input current received at the current input terminal increases, and comprising:
- an inverting input terminal;
- and
- an output terminal;
- and
- a transistor comprising:
- a first terminal coupled to the output terminal of the adaptive gain amplifier circuit;
- a second terminal coupled to the inverting input terminal of the adaptive gain amplifier circuit;
- and
- a third terminal coupled to a common terminal;
- wherein the adaptive gain amplifier circuit further comprises:
- a resistor coupled to the output terminal of the adaptive gain amplifier circuit and the third terminal of the transistor.
10 more elements
A logarithmic amplifier circuit, comprising:
- a current input terminal;
- an adaptive gain amplifier circuit configured to provide a gain that decreases as an input current received at the current input terminal increases, and comprising:
- an inverting input terminal;
- and
- an output terminal;
- and
- a transistor comprising:
- a first terminal coupled to the output terminal of the adaptive gain amplifier circuit;
- a second terminal coupled to the inverting input terminal of the adaptive gain amplifier circuit;
- and
- a third terminal coupled to a common terminal;
- wherein:
- the transistor is a first transistor;
- and
- the logarithmic amplifier circuit further comprises:
- a second transistor comprising:
- a first terminal coupled to the first terminal of the first transistor;
- a second terminal coupled to the output terminal of the adaptive gain amplifier circuit;
- and
- a third terminal coupled to a ground terminal.
17 more elements
A logarithmic amplifier circuit, comprising:
- an output terminal;
- an adaptive gain amplifier circuit comprising:
- a gain stage comprising:
- an input terminal;
- and
- an output terminal;
- and
- a first diode comprising:
- a cathode terminal coupled to the output terminal of the gain stage;
- and
- an anode terminal;
- a second diode comprising:
- a cathode terminal coupled to the anode terminal of the first diode;
- and
- an anode terminal;
- and
- a voltage source comprising:
- a first terminal coupled to the anode terminal of the second diode;
- and
- a second terminal coupled to a common terminal;
- and
- a transistor comprising:
- a first terminal coupled to the input terminal of the gain stage;
- a second terminal coupled to the common terminal;
- and
- a third terminal coupled to the output terminal of the logarithmic amplifier circuit.
23 more elements
Dependencies are inferred from the claim text.