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Mixer for eliminating second-order inter-modulation distortion and relevant transconductor circuit of mixer

A second-order intermodulation distortion and transconductance circuit technology, which is applied in the modulation transformation of diodes and other directions, can solve problems such as second-order intermodulation distortion

Active Publication Date: 2012-02-08
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] In view of this, the purpose of the present invention is to use a negative feedback circuit to adjust the transconductance circuit input stage signal of the mixer, to solve the problem of removing second-order intermodulation distortion

Method used

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  • Mixer for eliminating second-order inter-modulation distortion and relevant transconductor circuit of mixer
  • Mixer for eliminating second-order inter-modulation distortion and relevant transconductor circuit of mixer
  • Mixer for eliminating second-order inter-modulation distortion and relevant transconductor circuit of mixer

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Embodiment Construction

[0034] Figure 4 is a circuit diagram of a preferred embodiment of the mixer of the present invention. See Figure 4 , The mixer 40 includes a transconductor circuit 41 , a switch circuit 42 and a load circuit 43 . The load circuit 43 contains a resistor R C1 with R C2 , resistor R C1 with R C2 One end is coupled to a voltage source Vcc, the resistor R C1 with R C2 The other end is the output (Out). The switch circuit 42 includes npn bipolar transistors Q3, Q4, Q5, and Q6. Among them, the collectors of transistors Q3 and Q5 are coupled to resistor R C1 At the other end, the collectors of transistors Q4 and Q6 are coupled to resistor R C2 the other end of the Furthermore, the bases of the transistors Q3 and Q6 are coupled to each other, the bases of the transistors Q4 and Q5 are coupled to each other, and the bases of the transistors Q3 and Q4 can receive the local oscillating signal f LO . Furthermore, the emitters of the transistors Q3 and Q4 are coupled to each ...

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PUM

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Abstract

The invention discloses a transconductor circuit which is applicable to a mixer and used for eliminating second-order inter-modulation distortion. The transconductor circuit comprises a first transistor, a second transistor and a negative feedback circuit, wherein bases / gates of the first transistor and the second transistor are respectively coupled with a first input end and a second input end and used for receiving a differential input signal; an input end of the negative feedback circuit is coupled to emitters / sources of the first transistor and the second transistor, and an output end of the negative feedback circuit is coupled to the bases / gates of the first transistor and the second transistor; and the negative feedback circuit is used for adjusting voltages of the bases / gates of the first transistor and the second transistor according to a voltage difference between a detection voltage and a reference voltage of the emitters / sources of the first transistor and the second transistor.

Description

technical field [0001] The present invention relates to a mixer, especially a mixer used in a direct conversion receiver (DirectConversion Receiver) to eliminate second-order intermodulation distortion (Second-order Inter-Modulation Distortion; IM2) and Its related transduction circuit (transconductor). Background technique [0002] In a wireless transceiver (Wireless Transceiver), a mixer (Mixer) is a widely used frequency conversion component. figure 1 A typical direct conversion receiver 10 is shown, which includes an antenna 11, a low-noise amplifier (Low-Noise Amplifier; LNA) 12, a mixer 13, a local oscillator (Local Oscillator; LO) 14, a low-pass filter ( Low Pass Filter; LPF) 15 and amplifier 16. The direct conversion receiver 10 receives the radio frequency (Radio Frequency) signal by the antenna 11, and after the signal is amplified by the low noise amplifier 12, the mixer 13 directly down-converts the radio frequency signal to the baseband (Baseband) signal ( Ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D7/02
Inventor 陈旼珓萧硕源
Owner MEDIATEK INC
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