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Digital Gain Adjustable Mixer in Radio Frequency Identification

A radio frequency identification, digital technology, applied in gain control, demodulation, modulation transfer, etc., to achieve the effect of adjustable gain and increased power consumption

Active Publication Date: 2015-10-28
SHANGHAI HUAHONG INTEGRATED CIRCUIT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] like figure 1 The gain of the existing Gilbert mixer shown is relatively fixed, but in the actual system debugging process, if the gain of the mixer is adjustable, it will be of great help to the debugging of the overall system performance

Method used

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  • Digital Gain Adjustable Mixer in Radio Frequency Identification
  • Digital Gain Adjustable Mixer in Radio Frequency Identification
  • Digital Gain Adjustable Mixer in Radio Frequency Identification

Examples

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Embodiment Construction

[0033] Such as figure 2 Shown is the circuit diagram of the gain digital adjustable mixer in the radio frequency identification of the embodiment of the present invention, and figure 1 The difference in the circuit diagram of the existing Gilbert mixer shown is mainly that each switch tube of the switch circuit in the embodiment of the present invention has an additional setting of substrate electrodes and a resistor divider circuit that provides substrate bias voltage for each substrate electrode . Only the different parts of the embodiments of the present invention are described below.

[0034] The first NMOS switch tube M of the switch circuit in the embodiment of the present invention 4 , the second NMOS switch tube M 5 , the third NMOS switch tube M 6 and the fourth NMOS switch M 7 All include a substrate electrode, each of the substrate electrodes is connected and connected to a resistor voltage divider circuit, and the resistor voltage divider circuit provides a s...

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Abstract

The invention discloses a gain digital type adjustable frequency mixer in radio frequency identification. Each switching tube of a switching circuit of the gain digital type adjustable frequency mixer comprises a substrate electrode and all the substrate electrodes are connected with one another and are connected with a resistance voltage dividing circuit; and the resistance voltage dividing circuit is used for supplying a substrate biasing voltage to each substrate electrode. The resistance voltage dividing circuit comprises a plurality of voltage dividing resistors, a plurality of MOS (Metal Oxide Semiconductor) voltage dividing switching tubes and a decoder; all the voltage dividing resistors have the same resistance and are connected in series; each voltage dividing resistor is used for outputting a corresponding divided voltage at the serial-connection part and is connected with each substrate electrode through one MOS voltage dividing switching tube. One MOS voltage dividing switching tube is gated by the decoder so as to output one divided voltage to each substrate electrode. The frequency mixer provided by the invention has the advantages of adjustable gain and capability of adjusting the grain by a digital signal, and does not increase the self power consumption of the frequency mixer.

Description

technical field [0001] The invention relates to a mixer, in particular to a gain digital adjustable mixer in radio frequency identification. Background technique [0002] With the development of the Internet of Things technology, higher requirements are put forward for the performance of related equipment, and radio frequency identification (RFID), as an important part of the Internet of Things, also requires RFID readers and tags to have higher performance. As an important module in RFID, the mixer's main function is to realize frequency conversion by multiplying two signals. Conversion gain, noise, linearity, etc. are the key performance indicators of the mixer, which directly affect the performance of the RFID system. [0003] A mixer is generally composed of a transconductance stage, a switch stage, and a load. The transconductance stage converts the RF voltage signal into an RF current signal. The local oscillator signal is input to the switch stage to control the open...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03D7/00H03G3/20
Inventor 马和良倪昊景一欧
Owner SHANGHAI HUAHONG INTEGRATED CIRCUIT
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