Electric field intensity detecting circuit and limiter amplifier

A technology for detecting circuit and electric field strength, applied in amplifiers, differential amplifiers, amplifier combinations, etc., can solve problems such as deterioration of DC detection efficiency and inability to ensure linearity, and improve differential amplification gain, good detection efficiency, and number of components The effect of increasing inhibition

Inactive Publication Date: 2004-01-14
NIIGATA SEIMITSU +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the DC detection efficiency deteriorates, and in particular, the signal on the subsequent stage side will cause a defect in the signal in the AC state, so there is a problem that the above-mentioned linearity cannot be ensured.

Method used

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  • Electric field intensity detecting circuit and limiter amplifier
  • Electric field intensity detecting circuit and limiter amplifier
  • Electric field intensity detecting circuit and limiter amplifier

Examples

Experimental program
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Embodiment Construction

[0028] Hereinafter, an embodiment of the present invention will be described based on figures.

[0029] Figure 4 It is a diagram showing a partial configuration of the electric field intensity detection circuit of this embodiment. Here, although the configuration of the second stage is shown, the same configuration can be connected in multiple stages up to i=1 to n.

[0030] Such as Figure 4 As shown, the electric field strength detection circuit of this embodiment has at the i-level: two resistors R i1 , R i2 with two transistors Q i1 , Q i2 The differential pair and constant current circuit 1 i1 constitute the first differential amplifier 11. The two transistors that make up the differential pair Q i1 , Q i2 The sources are connected to each other, the constant current circuit 1i1 is connected to the common source.

[0031] In addition, each transistor Q i1 , Q i2 The drains are respectively passed through the resistor R i1 , R i2 Connect to power supply VDD....

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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 compsiring 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) to 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 (Ii12) which constitutes the second differential amplifier (12), thereby increasing the signal level for detection.

Description

technical field [0001] The present invention relates to an electric field intensity detection circuit and a limiting amplifier, in particular to an improved electric field intensity detection circuit capable of obtaining an electric field intensity detection signal with good linearity and a limiting amplifier using the same. technical background [0002] Generally, in electronic equipment such as radio receivers, mobile phones, wireless phones, television receivers, etc., which receive high-frequency signals (RF signals) and process them, the electric field strength of the received high-frequency signals is detected and output corresponding to the The electric field strength detection circuit of the direct current signal of the electric field strength level. [0003] figure 1 It is a diagram showing the configuration of a conventional electric field intensity detection circuit. exist figure 1 Among them, the high-pass filter 1 of the input stage is formed by the capacitor...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H03G11/00G01R29/08H03F1/02H03F3/45H03F3/68
CPCG01R29/08H03F3/00
Inventor池田毅宫城弘
OwnerNIIGATA SEIMITSU