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A Folded Linear Transconductance Upconverter

A frequency converter, folding technology, applied in the direction of multi-frequency modulation and conversion, can solve the problem of difficult application of low power supply voltage applications, etc., and achieve the effect of large input swing and high linearity

Active Publication Date: 2017-11-28
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this structure stacks 4 transistors from power supply to ground, making it difficult to apply to low supply voltage applications

Method used

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  • A Folded Linear Transconductance Upconverter
  • A Folded Linear Transconductance Upconverter
  • A Folded Linear Transconductance Upconverter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] The upconverter consists of a transconductance stage, a local oscillator switch and a load. The transconductance circuit uses a negative feedback loop to construct a super source follower structure, which completely copies the input voltage to both ends of the source degeneration resistor, thereby ensuring high linearity. The current generated by the transconductance stage is injected into the local oscillator switch through the current mirror, and the up-conversion signal and harmonic mixing products are generated by the frequency conversion effect of the local oscillator switch. The LC band-pass filter network at the load end filters out the harmonic mixing products. Output pure up-conversion signal. Its structure can be divided into three modules: linear transconductance stage, double-balanced local oscillator switch and load stage.

[0015] Specifically, the linear transconductance stage includes: the positive terminal of the input signal is connected to the gate of t...

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Abstract

The invention relates to a folding linear transconductance upconverter, which includes a high-linearity intermediate frequency transconductance circuit, a double-balanced local oscillator switch and a load circuit; the invention is a folding structure, and the current generated by the transconductance stage is copied to the The local oscillator switch reduces the number of stacked transistors in the branch where the local oscillator switch is located from four to three, thereby relieving the voltage margin. The transconductance stage realizes the voltage-current conversion function with high linearity through the negative feedback circuit based on the operational amplifier. At the same time, in order to ensure the voltage margin of the transconductance stage, the linear transconductance circuit shifts the bias voltage at both ends of the transconductance resistance by a gate-source voltage compared with the input voltage. The up-mixing circuit can work under a lower power supply voltage and has the characteristics of high linearity.

Description

Technical field [0001] The invention relates to a transconductance up-converter, to be precise, a folding linear transconductance up-converter. Background technique [0002] The radio frequency transmitting circuit usually must have high linearity to ensure that the output regenerated spectrum is controlled within a reasonable range. The linearity of the upconverter has an important influence on the linearity of the entire transmission link, so it is very important to optimize the linearity of the upconverter. The most basic up-converter implementation is based on the Gilbert mixer structure by replacing the load resistance with an LC filter network. This structure can simultaneously achieve up-conversion and filtering functions. However, since the transconductance stage of the Gilbert structure is only composed of differential MOS pairs, its linearity cannot be effectively guaranteed. [0003] In view of the fact that the input signal of the up-converter is located in the low f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03D7/16
Inventor 陈超吴建辉李红黄成
Owner SOUTHEAST UNIV