Electric field intensity detecting circuit and limiter amplifier
AssigneeNiigata Seimitsu Co., Ltd.
InventorsTakeshi Ikeda, Hiroshi Miyaga
Life of this patent
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Abstract
A second differential amplifier (12) is additionally disposed in parallel with at least a part of first differential amplifiers (11) in respect to a differential amplifying circuit comprising a multi-stage connection of the first differential amplifiers (11) so that a to-be-detected signal may be obtained from the second differential amplifier (12) via a transistor (Qi). Thus, a large current is made to flow through a constant current circuit (Ii1) which constitutes the first differential amplifier (11) to increase a differential amplification gain. A small current is made to flow through a constant current circuit (Ii2) which constitutes the second differential amplifier (12), thereby increasing the signal level for detection.
Claims2
An electric field intensity detecting circuit, comprising:
- a differential amplifier circuit including plural first differential amplifiers connected in a multistage arrangement,
- the plural first differential amplifiers each amplifying an input signal from a preceding stage and outputting an output signal to a subsequent stage;
- and
- a plurality of second differential amplifiers arranged only in parallel with a portion of the plural first differential amplifiers on a post-stage side of the differential amplifier circuit,
- wherein a to-be-detected signal is obtained from an output of at least one of the plurality of second differential amplifiers.
A limiter amplifier, comprising:
- a differential amplifier circuit including plural first differential amplifiers connected in a multistage arrangement,
- each of the plural first differential amplifiers amplifying an input signal from a preceding stage and outputting an amplified signal to a subsequent stage, and
- plural second differential amplifiers arranged only in parallel with a portion of the plural first differential amplifiers on a post-stage side.
Dependencies are inferred from the claim text.