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Radio frequency modules and modules for moving target detection

Imported: 23 Feb '17 | Published: 22 Oct '02

Katsuhiko Higuchi, Shinichiro Takatani

USPTO - Utility Patents

Abstract

It is an object of the present invention to provide a radio frequency module incorporating an MMIC that has a high S/N ratio while ensuring a high output.

A radio frequency module according to the present invention incorporates an MMIC having a field effect transistor in which channel layers for traveling of carriers are formed by a heterostructure of two or more different kinds of materials, and height of a potential barrier of an interface between the different kinds of materials is less than 0.22 eV.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram of assistance in explaining a monolithic microwave integrated circuit;

FIG. 2 is a sectional view of a fundamental device to be used in a radio frequency module according to the present invention;

FIG. 3 is a block configuration diagram of a fundamental circuit of a radio frequency module according to the present invention;

FIG. 4 shows a comparison of frequency dependence of current noise spectrum densities of the fundamental device to be used in a radio frequency module according to the present invention and a fundamental device used in a conventional radio frequency module;

FIG. 5 is a diagram of a band structure at an interface of a composite channel of a conventional field effect transistor;

FIG. 6 is a diagram of a band structure at an interface of a composite channel of a field effect transistor according to the present invention;

FIG. 7 is a sectional view of another field effect transistor according to the present invention;

FIG. 8 is a diagram of a fundamental circuit configuration of an oscillator;

FIG. 9 is a diagram of a fundamental circuit configuration of an amplifier; and

FIG. 10 is a diagram of a fundamental circuit configuration of a mixer.

Claims

1. A radio frequency module comprising:

2. A radio frequency module comprising:

3. A radio frequency module as claimed in claim 2, further including a monolithic microwave integrated circuit portion having a terminal for extracting an intermediate frequency signal by mixing an output signal from said receiver with an output signal from said oscillator.

4. A radio frequency module comprising:

5. A radio frequency module as claimed in claim 3,

6. A radio frequency module comprising:

7. A radio frequency module as claimed in claim 1,

8. A radio frequency module as claimed in claim 2,

9. A radio frequency module as claimed in claim 3,

10. A radio frequency module as claimed in claim 4,

11. A radio frequency module as claimed in claim 5,

12. A module for moving target detection comprising: