Low-voltage and high-linearity up-converter and low-voltage and high-linearity up-conversion signal output method
A high linearity, signal output technology, applied in the field of radio frequency transceiver, can solve problems such as difficulty in applying low power supply voltage, increase power consumption of up-converter, etc., to meet the requirements of low power supply voltage and low power consumption, low power consumption, and reduced current The effect of consumption
Active Publication Date: 2015-04-22
SOUTHEAST UNIV
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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
In addition, two independent op amps on the differential side also increase the power consumption of the entire upconverter
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[0022] The present invention will be further described below in conjunction with the accompanying drawings.
[0023] A low-voltage high-linearity up-conversion signal output method, using a negative feedback circuit to construct a transconductance circuit based on a super source follower structure, so that the intermediate frequency current flowing through the local oscillator switch and the input voltage present a highly linear relationship; and using a current mirror to convert The conversion current is copied and injected into the local oscillator switch, and the up-conversion signal and harmonic mixing products are generated by the frequency conversion of the local oscillator switch, and then the harmonic mixing products are filtered out by the load circuit, and a pure up-conversion signal is output.
[0024] The idea is: use the negative feedback circuit to construct a transconductance circuit based on the super source follower structure, so that the intermediate frequency...
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The invention discloses a low-voltage and high-linearity up-converter and up-conversion signal output method. The low-voltage and high-linearity up-converter comprises a transconductance circuit, a local vibrator switch and a load circuit. The low-voltage and high-linearity up-conversion signal output method is characterized in that the transconductance circuit based on a super source following structure is constructed by a negative feedback circuit, so that a high-linearity relation between the intermediate frequency flowing through the local vibrator switch and the input voltage is shown; the conversion current is copied and injected into the local vibrator switch by a current mirror, up-conversion signals and a harmonic frequency mixing product are generated under the frequency conversion action of the local vibrator switch, the harmonic frequency mixing product is filtered out by a load circuit, and pure up-conversion signals are output. According to the low-voltage and high-linearity up-converter provided by the invention, the linearity of the whole up-converter can be obviously enhanced; meanwhile, the number of transistors stacked between a power supply and the ground is controlled to be smaller than three by the up-converter, so that the up-converter can effectively adapt to low-power-voltage application occasions.
Description
technical field [0001] The invention relates to a low-voltage high-linearity up-converter circuit based on transconductance multiplication technology, and belongs to the technical field of radio frequency transceiver. Background technique [0002] In the radio frequency transceiver system, the transmitting circuit must have high linearity to ensure that the output regenerated spectrum is controlled within a reasonable range. The up-conversion circuit is located in the previous stage of the power amplifier, and its linearity directly affects the linearity of the entire transmission chain, so it is very important to optimize the linearity design of the up-converter. The traditional up-converter implementation is implemented by using an LC filter network at the load stage of a Gilbert mixer structure, which can simultaneously perform up-conversion and filtering functions. However, since the transconductance stage of the Gilbert structure is only composed of differential MOS pa...
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IPC IPC(8): H03D7/16
Inventor 陈超吴建辉黄成李红田茜
Owner SOUTHEAST UNIV