Temperature compensation circuit and a variable gain amplification circuit
OwnerShoji Otakainventor
Life of this patent
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Abstract
A temperature compensation circuit comprises a signal source to output a first signal corresponding to a temperature change of an ambient temperature to a predetermined temperature, and a multiplier to multiply an external gain control signal and the first signal and output a second signal proportional to the temperature change and the first signal to a variable gain amplifier to perform the temperature compensation with respect to the variable gain amplifier.
Claims21
A temperature compensation circuit performing a temperature compensation with respect to a gain characteristic of a variable gain amplifier fabricated by MOS transistors and gain-controlled by an external gain control signal, the circuit comprising:
- a signal source configured to output a first signal corresponding to a temperature change of an ambient temperature to a predetermined temperature;
- and
- a multiplier configured to multiply the external gain control signal and the first signal and to output a second signal proportional to the temperature change to the variable gain amplifier.
A temperature compensation circuit performing a temperature compensation with respect to a gain characteristic of a variable gain amplifier, using an external gain control signal, the apparatus comprising:
- a signal source configured to output a first signal corresponding to a temperature change of an ambient temperature to a predetermined temperature;
- a multiplier configured to multiply the external gain control signal and the first signal and output a second signal proportional to the temperature change and the external gain control signal;
- a differential amplifier configured to be supplied with the external gain control signal and output a third signal (ICNTO) having substantially no temperature dependency, the differential amplifier including a source regenerate resistor;
- and
- an adder configured to add the second signal and the third signal to output a fourth signal to the variable gain amplifier.
A variable gain amplification circuit, comprising:
- a variable gain amplifier -fabricated by MOS transistors and gain-controlled by an external gain control signal;
- and
- a temperature compensation circuit configured to perform a temperature compensation with respect to the external gain control signal, the temperature compensation circuit including a signal source configured to output a first signal corresponding to a temperature change of an ambient temperature to a predetermined temperature, and a multiplier configured to multiply the external gain control signal and the first signal and output a second signal proportional to the temperature change and the external gain control signal to the variable gain control amplifier.
A temperature compensation method of performing a temperature compensation with respect to a gain characteristic of a variable gain amplifier fabricated by MOS transistors and gain-controlled by an external gain control signal, the method comprising:
- generating a first signal corresponding to a temperature change of an ambient temperature to a predetermined temperature;
- and
- multiplying the external gain control signal and the first signal and output a second signal proportional to the temperature change and the first signal to the variable gain amplifier to perform the temperature compensation with respect to the variable gain amplifier.
Dependencies are inferred from the claim text.