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Frequency mixer and direct down-conversion receiver

A mixer and inverter technology, applied in the field of communication, can solve the problem of large flicker noise in the down-conversion mixer

Active Publication Date: 2009-06-03
TIANJIN LANGBO MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims to provide a low-noise down-conversion mixer, which can solve the problem of large flicker noise of the down-conversion mixer in the prior art

Method used

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  • Frequency mixer and direct down-conversion receiver
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  • Frequency mixer and direct down-conversion receiver

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Embodiment Construction

[0024] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0025] image 3 Shown is a circuit diagram of a Gilbert-type mixer incorporating a capacitive impedance circuit of the present invention, comprising:

[0026] A conversion circuit, which includes a switch tube M1 and a switch tube M2 constituting a differential circuit, for converting a radio frequency voltage signal into a current signal;

[0027] A down-conversion circuit, which includes a pair of switch tubes M3 and M4 and a pair of switch tubes M5 and M6 constituting a differential circuit, for down-converting the current signal flowing out of the conversion circuit to an intermediate frequency or baseband;

[0028] A load circuit, which includes a resistor R1 and a resistor R2 forming a differential circuit, for converting the down-converted current signal into a voltage signal; and

[0029] The capacitive impedance circuit L1...

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Abstract

The invention discloses a frequency mixer which comprises a switching circuit, a down-conversion circuit, a load circuit and a capacitive impedance circuit, wherein, the frequency mixer comprises a switching tube M1 and a switching tube M2 connected in a differentiated way and is used for converting a radio-frequency voltage signal into a current signal, the down-conversion circuit comprises a common source switching tube pair M3, M4,, M5 and M6 connected in a differentiated way and is used for down-conversion of the current signal from the switching circuit to middle frequency or a baseband,the load circuit comprises a resistance R1 and a resistance R2 connected in a differentiated way and is used for converting the current signal after the down-conversion to a voltage signal, the capacitive impedance circuit is used for offsetting parasitic capacitance in common source point A of the switching tube pair M3 and M4 and / or the parasitic capacitance in common source point B of the switching tube pair M5 and M6. On the premise of not introducing extra power consumption, the frequency mixer and the direct down-conversion receiver in the invention can effectively eliminate flicker noise of the frequency mixer.

Description

technical field [0001] The invention relates to the communication field, in particular to a low-noise down-conversion mixer and a direct down-conversion receiver. Background technique [0002] In modern wireless communication equipment, a direct down conversion receiver (Direct Down Conversion Receiver) is more and more widely used due to its advantages of low cost and low power consumption. [0003] The mixer is an important component in a direct down conversion receiver. The proportion of CMOS technology in the field of semiconductor manufacturing is gradually increasing. At present, the mixer of the direct down-conversion receiver usually adopts the Gilbert type mixer based on the CMOS technology. [0004] The structure of the traditional Gilbert-type mixer in CMOS process is as follows figure 1 As shown, it is composed of RF input amplifier circuit, switch tube and load output circuit. The RF voltage signal is converted into a current signal by the input stage transco...

Claims

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Application Information

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IPC IPC(8): H04B1/00H04B1/06
Inventor 马欣龙王文申
Owner TIANJIN LANGBO MICROELECTRONICS
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