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Up-conversion frequency mixer with high linearity and suitable for low-voltage work

A high-linearity, low-voltage technology, applied in the direction of modulation conversion of semiconductor devices with at least two electrodes, can solve the problem of deteriorating the linearity of frequency conversion mixers, and achieve the effect of eliminating the equivalent DC offset error voltage

Inactive Publication Date: 2010-10-27
BEIJING LIYUN TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In practical circuit design, the above requirements may deteriorate the linearity of the up-conversion mixer

Method used

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  • Up-conversion frequency mixer with high linearity and suitable for low-voltage work
  • Up-conversion frequency mixer with high linearity and suitable for low-voltage work
  • Up-conversion frequency mixer with high linearity and suitable for low-voltage work

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Embodiment Construction

[0023] The up-conversion mixer with high linearity and suitable for low-voltage operation proposed by the present invention has a structural block diagram such as figure 1 shown, including:

[0024] The first current mirror is used for receiving the first bias voltage and the second bias voltage from the external power supply, so as to turn on the PMOS transistors constituting the current mirror, and output the first current and the second current. The first current mirror, whose structure is as figure 2 As shown, it is composed of four PMOS transistors M575-M578, and it is a vertical two-way symmetrical structure. The drain of one PMOS transistor in each PMOS transistor is connected to the source of the next PMOS transistor, and the gate of the symmetrically positioned PMOS transistor The poles are connected to the same bias voltage, which is a cascode current mirror;

[0025] The first amplifier is used to receive the third bias voltage of the external power supply, and p...

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Abstract

The invention relates to an up-conversion frequency mixer with high linearity and suitable for low-voltage work, which belongs to the technical field of integrated circuits and comprises a first current mirror, a second current mirror, a third current mirror, a second amplifier, a resistance network and a rectifying and biasing circuit. Input signals are fed back and loaded to drain electrodes of PMOS and NMOS current mirrors through an amplifier, and are ensured to have larger amplitude of oscillation without amplitude limit under low voltage, and the linearity of the overall up-conversion frequency mixer under low voltage and large amplitude signal input conditions is ensured. The invention has the function of eliminating equivalent DC detuning error voltage, and the function almost does not affect the linearity of the up frequency mixer.

Description

technical field [0001] The invention relates to an up-conversion mixer with high linearity and suitable for low-voltage operation, which belongs to the technical field of integrated circuits. Background technique [0002] In a direct up-conversion transmitter, firstly, in order to ensure the signal-to-noise ratio of the transmitted signal, the amplitude of the input signal of the up-mixer is required to be large enough; secondly, because the equivalent DC offset error voltage at the input end of the up-mixer will The output of the LO causes leakage of the local oscillator, which will deteriorate the quality of the transmitted signal. The LO leakage suppression ratio of the transmitted signal is determined by the ratio of the amplitude of the input signal at the input end of the up-mixer to the equivalent DC offset error voltage. Therefore, in order to ensure the local oscillator leakage suppression ratio of the output signal, the input signal amplitude of the up-mixer is re...

Claims

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Application Information

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IPC IPC(8): H03D7/12
Inventor 罗可欣
Owner BEIJING LIYUN TECH DEV