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Mixer circuit

A technology of mixing circuit and transistor, which is applied to electrical components, modulation transformation and transmission system of semiconductor devices with at least two electrodes, can solve the problems of noise figure increase and noise generation, and achieve the goal of reducing noise figure and increasing gain Effect

Inactive Publication Date: 2011-04-20
FRAMATOME CONNECTORS INT SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] However, in the existing mixing circuit, although the control pulses applied to the gates of the first-eighth MOS transistors (M1-M8) as switching transistors have phase differences, the duty ratio of the control pulses is 50 % fixed state is entered
[0012] Thus the existing mixing circuit such as figure 2 As shown, there is a disadvantage that the noise figure (NF) increases when the duty cycle is in the 50% band, so there is a problem that noise occurs when turning on / off

Method used

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Embodiment Construction

[0033] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0034] image 3 is a circuit diagram of an embodiment of a mixing circuit according to the present invention.

[0035]As shown in the figure, the frequency mixing circuit of the present invention includes: the first frequency mixing circuit (1), in the first frequency mixing circuit (1), the first and second input signal (MIX_INP) (MIX_INN) terminals are respectively connected to The source coupling terminals of the first and second MOS transistors (M1, M2) and the third and fourth MOS transistors (M3, M4) connected in pairs in a source coupling manner, the second and third MOS transistors (M2) , (M3) drains cross each other and are connected with the drains of the first and fourth MOS transistors (M1) (M4) respectively to the first and second output signal (IF_IP) (IF_IN) terminals, the first, The gate of the 4th MOS transistor (M1) (M4) is connected ...

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Abstract

The present invention discloses a mixer circuit for mixing two input signals by source-coupled MOS transistors and outputting a mixed result. A duty cycle controlling MOS transistor is connected to a source of each source-coupled MOS transistor in series. A duty cycle controlling pulse is applied to a gate of the duty cycle controlling MOS transistor. The duty cycle controlling pulse has a phase shift of -90 degrees with respect to a controlling pulse applied to the gate of the source-coupled MOS transistor connected with the duty cycle controlling MOS transistor in series. An AND-combination of the duty cycles of the two controlling pulses applied to the gates of the two MOS transistors connected in series can be controlled at 25%. Comparing to the conventional mixer circuit having a switch control duty cycle of 50%, the present invention achieves the effects of increasing the gain and reducing the noise figure.

Description

【Technical field】 [0001] The present invention relates to a frequency mixing circuit used in radio frequency (RF) transceivers, etc., and in particular to a noise figure (Noise Figure) that can improve the opening / closing of the switching transistor, so that the noise figure can be optimized of the mixing circuit. 【Background technique】 [0002] In general, a radio frequency (RF) transceiver uses a mixer circuit that mixes an input signal with a reference signal to extract an intermediate frequency signal from the mixed signal for demodulation, or to carry an intermediate frequency to It is used when modulation is performed. At this time, the noise figure (Noise Figure) will be generated by the on / off of the switching transistor of the mixer circuit. [0003] figure 1 It is a schematic diagram of a common frequency mixing circuit. [0004] As shown in the figure, it consists of the following two circuits. The first mixing circuit 1 makes the two input signals (MIX_IP) (M...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D7/12H04B1/40
CPCG06G7/16H03D7/00
Inventor 金永镇罗一淏郑椿植孙成荣李承鈱黄明运
Owner FRAMATOME CONNECTORS INT SA